IDENTIFICATION_INFORMATION

  Citation:
    Citation_Information:
      Originator: National Earthquake Information Center World Data Center
      Publication_Date: 1994
      Title: National Earthquake Information Center World Data Center
        for Seismology, Denver
      Edition: 
      Geospatial_Data_Presentation_Form: Map
      Publication_Information:
        Publication_Place: 
        Publisher: 
      Other_Citation_Details:
      Online_Linkage: <http://wwwneic.cr.usgs.gov/neis/epic/database.html
      Larger_Work_Citation:
        Citation_Information:
          Originator: 
          Publication_Date: 
          Title: 
          Publication_Information:
            Publication_Place: 
            Publisher: 
          Online_Linkage: 
  Description:
    Abstract:
      This data base provides information on earthquakes from
      2100 B.C. to the present. The data base contains
      earthquakes with known magnitude values between 0.1 and
      9.9. Earthquakes that have no computed magnitude values are
      also included in the data base. Users of micro-earthquake
      data (magnitude less than or equal to 0.0) should contact
      institutions that operate seismograph networks in their
      area of interest. In reality, there are very few events
      with magnitude less than 2.0 in the data base.
    Purpose:
      unknown
    Supplemental_Information:
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 2100 B.C.
        Ending_Date: present
    Currentness_Reference: 
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: Continually
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: 73.669 
      East_Bounding_Coordinate: 131.189
      North_Bounding_Coordinate: 49.212
      South_Bounding_Coordinate: 21.405 
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: None
    Place:
      Place_Keyword_Thesaurus: None
  Access_Constraints:
    none
  Use_Constraints:
    It is ultimately the user's responsibility to assess the
    accuracy and completeness of a data-set extracted from the
    data base and to determine if these are sufficient for the
    purposes to which the data-set would be applied.
  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey; National Earthquake Information Center
        Contact_Person: Madeleine Zirbes
      Contact_Position: 
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 
        Country: 
      Contact_Voice_Telephone: 
      Contact_Facsimile_Telephone: 
      Contact_Electronic_Mail_Address: zirbes@usgs.gov
      Hours_of_Service: 
  Native_Data_Set_Environment:
    ArcView version 3.1 shapefile format
    d:\data\database\mapbase\i_lcov\quakes.shp

DATA_QUALITY_INFORMATION

  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      The current data base was assembled over a period of
      several decades. Constituent catalogs were in some cases
      entered manually into the data base from published papers
      and in other cases entered from computer tapes supplied to
      the NEIC by representatives of the institutions that
      compiled the catalogs. Some of the catalogs were provided
      to the U.S. Geological Survey in computer-readable form by
      the National Geophysical Data Center of the National
      Oceanic and Atmospheric Administration (NOAA) (Rinehart and
      others, 1985). If
      an entry attributed to a source in the data base is not
      consistent with the entry for the same earthquake given in
      the source publication or preferred by the source
      institution, the latter should taken as authoritative. Some
      catalogs in the data base are updated versions of those
      described in the cited reference, provided by the authors
      and prepared using the conventions described in the
      reference. The
      USGS has not been able to determine the sources for some
      catalogs in the data base. These catalogs are retained in
      the data base because they clearly represent major
      cataloging efforts, and they may include significant
      earthquakes that are not included in other catalogs. Users
      who examine the output for several different catalogs will
      commonly find that the catalog entries are inconsistent for
      some seismic events. The same earthquake may have slightly
      different hypocenters or magnitudes in two different
      catalogs, or an earthquake may be listed in one catalog and
      not in another. The following are some reasons for these
      discrepancies: 1.
      Modern hypocenters and magnitudes are computed with
      seismographic data, using computer programs that make
      simplifying assumptions about the earth; differences
      between data base entries may arise from differences in the
      data or the computer programs. The first modern
      seismographs were invented in the time period 1880 - 1900.
      2. compilers of the different data bases sometimes had
      different conventions about the size or locations of the
      earthquakes listed. 3.
      There are a number of different types of earthquake
      magnitude, corresponding to seismic energy in different
      frequency bands, and the different types of magnitude
      calculated for a single earthquake commonly differ
      slightly, and under some circumstances, may differ greatly.
      4. of earthquakes are listed to different levels
      or precision in the different data bases, and some data
      bases list origin-times for historical earthquakes in local
      times, rather than the more customary Coordinated Universal
      Time (UTC). 5.
      Hypocenters of earthquakes are listed to different levels
      of precision in the different data bases. 6.
      Estimates of the hypocenters and magnitudes of earthquakes
      before about 1900 must commonly be based on scant evidence,
      and the compilers of different catalogs sometimes
      interpreted the scant evidence differently.
  Logical_Consistency_Report:
  Completeness_Report:
    The temporal extent of the data base extends from 2000B.C.
    through the current week of the Preliminary Determination
    of Epicenters (PDE) program. Each earthquake in the data
    base is detailed according to source, date, time, latitude,
    longitude, magnitude, intensity, and seismic-related
    information. An earthquake is extracted from the data base
    when it meets all input user-conditions. The
    data base is not static; as additions or modifications are
    made available, new data are added and old data are
    deleted. The catalogs are not systematically critiqued for
    erroneous or missing data. The user should be aware that
    some of the source-institutions for catalogs in the data
    base may have produced more recent versions of the catalogs
    than those in the present data base. Micro-earthquakes
    having magnitudes below 1.0 are not retained in the data
    base. Earthquakes with magnitudes less than 2.0 are found
    in the data base, but in general, the magnitude level of
    earthquakes in the data base range from 2.5-9.5. Users of
    micro-earthquake data should contact institutions that
    operate seismograph networks in their area of interest.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report:
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Paula K. Dunbar, Patricia A. Lockridge, and Lowell S.Whiteside 
          Publication_Date: September 1992 
          Title: SIGNIFICANT WORLDWIDE EARTHQUAKES (NOAA) 
          Other_Citation_Details:
            This catalog is a listing of earthquakes, 2150 B.C. - 1991 supplemented by 
            post-1991 data from the USGS/NEIC. The list includes all events that meet at least one of the 
            following criteria:
            1. Moderate damage (approximately $1 million or more)
            2. Ten or more deaths
            3. Magnitude 7.5 or greater
            4. Intensity X or greaterbr> The events occurring prior to 1900 were assigned an epicenter based
                  on the locations where damage occurred. Magnitudes are stated as Ms (Surface Wave) or the equivalent 
                  derived from intensities for pre-instrumental events. 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: USGS/NEIC, 1973-present
          Publication_Date: 1973-present
          Title: USGS/NEIC, 1973-present 
          Other_Citation_Details:
            (PDE) Catalog of earthquakes located by the USGS NEIC and
            its predecessors in the U.S. Coast and Geodetic Survey, the
            National Oceanic Survey, and the Environmental Research
            Laboratories of the Department of Commerce. Listings are
            from three different publications: (PDE-W)
            PDE Weekly Listing. This file covers the time period
            following the Monthly data up to four weeks behind the
            current week. The Weekly PDE data are replaced by the
            Monthly PDE data as soon as they become available.
            USGS/NEIC
            Most Recent Events (PDE-Q) Daily listing, known as Quick
            Epicenter Determinatins (QED). These data are extremely
            preliminary and the parameters of the earthquakes are
            subject to change as more data are used to relocate the
            earthquakes. The daily PDE-W covers the time fram following
            the Weekly PDE data up to the current date. These data are
            replaced by the Weekly PDE data. (PDE)
            Preliminary Determinations of Epicenters, Monthly Listing.
            This list is the most complete computation of hypocenters
            and magnitudes done by the USGS NEIC. It is normally
            produced a few months after the events occur. The
            publication is called "Preliminary" because the "final"
            computation of hypocenters for the world is considered to
            be the Bulletin of the Internation Seismological Centre
            (ISC), which is produced about two years after the
            earthquakes occur. The NEIC PDE program contributes about
            one-third off all data used by the ISC.
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: USGS/NEIC
          Title: USGS/NEIC Most Recent Events (PDE-Q) 
          Other_Citation_Details: 
            This contains only PDE-Q events described in the previous section. 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: USHIS 
          Title: SIGNIFICANT U.S. EARTHQUAKES (USHIS) 
          Other_Citation_Details: 
            A catalog of principal earthquakes in the United States, 1568 - 1989 
            (Stover, C.W. and Coffman, J. L., 1993). The catalog is a history of earthquakes which have 
            magnitudes greater than or equal to 4.5 or intensity of VI or larger. Exceptions are Alaska 
            and offshore areas of California, Oregon, and Washington where only earthquakes having magnitudes 
            of 5.5 or larger or intensitites of VI or larger are included. It does not include earthquakes in 
            Puerto Rico. the Virgin Islands, American Samoa, Guam, or Northen Marianas. 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: California Division of Mines and Geology
          Publication_Date: 1974
          Title: CALIFORNIA, 1735 - 1974 (CDMG)
          Other_Citation_Details: 
            compiled by Real and others (1978) and Toppozada and others (1984) at the 
            California Division of Mines and Geology. This file includes hypocenters from catalogs of the 
            Seismological Laboratory of the California Institute of Technology (PAS) and the Seismological 
            Stations of the University of California at Berkeley (BRK). 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Earth Physics Branch (EPB) of Canada, now the Geological Survey of Canada
          Publication_Date: 1992
          Title: CANADA, 1568 - 1992 (EPB) 
          Other_Citation_Details: 
            compiled by the Earth Physics Branch (EPB) of Canada, now the Geological 
            Survey of Canada. Also includes U.S. earthquakes occurring near the Canadian border. Only the 
            prime hypocenters (those selected by EPB/GSC as the best solutions for their earthquakes) are 
            entered into the data base; in some cases (indicated in the authority column), these prime 
            hypocenters may have been computed by an institution other than the EPB/GSC. 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: INDIA 
          Publication_Date: 1984
          Title: INDIA, 1063 - 1984 (INDIA)
          Other_Citation_Details: 
            This is a combination of four catalogs (Tandon. A.N. and Srivastava, H.N., 1974; 
            Chandra, Umesh, 1977; Rao and Rao, 1984; Srivastava, H.N., and Ramachandran, 1983). See the authority 
            column for the catalog identification. The ebtries that could be identified as duplicates from the four 
            catalogs have been eliminated from the final listing. The abbreviations that identify the magnitude source 
            are listed in the publication by Rao and Rao, 1984. 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: NGDC
          Publication_Date: 1979
          Title: MEXICO, CENTRAL AMERICA, AND CARIBBEAN, 1900 - 1979 (NGDC)
          Other_Citation_Details: 
            compiled at NOAA (Rinehart and others, 1982). 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: SISRA
          Publication_Date: 1981 
          Title: SOUTH AMERICA, 1471 - 1981 (SISRA)
          Other_Citation_Details: 
            compiled for Proyecto SISRA, Programa para la Mitigacion de los Effectos de los 
            Terremotos en la Region Andina (Projeft SISRA, Earthquake Mitigation Program in the Andean Region), 
            edited by Askew and Algermissen, 1985. 
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: SRA
          Publication_Date: 1986
          Title: EASTERN, CENTRAL, AND MOUNTAIN STATES OF THE UNITED STATES, 1534 - 1986 (SRA) 
          Other_Citation_Details: 
            (Stover and others, 1984). An early version of the catalog was developed under the direction of S.T. 
            Algermissen for the contiguous 48 states; updated and revised files have been published in a series 
            of Miscellaneous Field Studies Maps. The states of Nevada, California, Oregon, Washington, Alaska, 
            and Hawaii are not covered in this catalog. 

SPATIAL_DATA_ORGANIZATION_INFORMATION

  Direct_Spatial_Reference_Method: Point
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Point
      Point_and_Vector_Object_Count: 5686

SPATIAL_REFERENCE_INFORMATION

  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 
      Longitude_Resolution: 
      Geographic_Coordinate_Units: Decimal Degrees
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1927
      Ellipsoid_Name: Clarke 1866
      Semi-major_Axis: 
      Denominator_of_Flattening_Ratio: 

ENTITY_AND_ATTRIBUTE_INFORMATION

  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: sa_quakes.dbf
      Entity_Type_Definition: Shapefile Attribute Table
      Entity_Type_Definition_Source: None
    Attribute:
      Attribute_Label: Cat
      Attribute_Definition: Contributing source, or authority. In the following
        section, the abbreviation of each catalog source is in by
        parenthesis. The catalog abbreviations are listed in
        alphabetic order. Catalogs "supplied by NOAA" came to the
        NEIC from the National Geophysical Data Center of the
        National Oceanic and Atmospheric Administration (Rinehart
        and others, 1985). Contributing
        source, or authority. In the following section, the
        abbreviation of each catalog source is in by parenthesis.
        The catalog abbreviations are listed in alphabetic order.
        Catalogs "supplied by NOAA" came to the NEIC from the
        National Geophysical Data Center of the National Oceanic
        and Atmospheric Administration (Rinehart and others, 1985).
        Contributing
        source, or authority.
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: PDE
          Enumerated_Domain_Value_Definition: Preliminary Determinations of Epicenters, Monthly Listing.
            This list is the most complete computation of hypocenters
            and magnitudes done by the USGS NEIC. It is normally
            produced a few months after the events occur.
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: PDE-Q
          Enumerated_Domain_Value_Definition: Daily listing, known as Quick Epicenter Determinatins
            (QED). These data are extremely preliminary and the
            parameters of the earthquakes are subject to change as more
            data are used to relocate the earthquakes. The daily PDE-W
            covers the time fram following the Weekly PDE data up to
            the current date. These data are replaced by the Weekly PDE data.
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: PDE-W
          Enumerated_Domain_Value_Definition: PDE Weekly Listing. This file covers the time period
            following the Monthly data up to four weeks behind the
            current week. The Weekly PDE data are replaced by the
            Monthly PDE data as soon as they become available.
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: SISRA
          Enumerated_Domain_Value_Definition: compiled for Proyecto SISRA, Programa para la Mitigacion de
            los Effectos de los Terremotos en la Region Andina (Project
            SISRA, Earthquake Mitigation Program in the Andean Region),
            edited by Askew and Algermissen, 1985.
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Year
      Attribute_Definition: Year earthquake occurred
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 198
          Range_Domain_Maximum: 1998
    Attribute:
      Attribute_Label: Mo
      Attribute_Definition: Month earthquake occurred
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 1
          Range_Domain_Maximum: 12
    Attribute:
      Attribute_Label: Da
      Attribute_Definition: Day earthquake occurred
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Range Domain (1-31)
    Attribute:
      Attribute_Label: Orig_time
      Attribute_Definition: (Orig Time in Screen Format) Given in Coordinated Universal
        Time (UTC)
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Number Field - Time written in coordinated universal time (UTC)
    Attribute:
      Attribute_Label: Lat
      Attribute_Definition: Latitude
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -60
          Range_Domain_Maximum: 25.9
    Attribute:
      Attribute_Label: Lon
      Attribute_Definition: Longitude
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -94.49
          Range_Domain_Maximum: -32.56
    Attribute:
      Attribute_Label: Dep
      Attribute_Definition: Depth: Value given in kilometers
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Range Domain - depth in km
    Attribute:
      Attribute_Label: Mag
      Attribute_Definition: Magnitude, a logarithmic measure of the "size" of an
        earthquake, is related to the energy released as seismic
        waves at the focus of an earthquake. Although the magnitude
        scale has neither "top" nor "bottom" values, the highest
        magnitude known was about 9.5, the lowest about -3.0. On
        this logarithmic scale, a magnitude 6.0 shallow-focus
        earthquake represents elastic-wave energy about 30 times
        larger than that generated by a magnitude 5.0 earthquake,
        900 times (30x30) larger than that of a magnitude 4.0
        shock. Many
        factors influence the determination of earthquake
        magnitude, including focal depth, distance between
        earthquake focus and observing station, frequency content
        of the sampled energy, and earthquake radiation pattern.
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 5
          Range_Domain_Maximum: 9.5
    Attribute:
      Attribute_Label: Maginfo
      Attribute_Definition: The contributed magnitude field consists of 7 characters:
        positions 1-2 = magnitude scale; and postions 3-7 =
        organization source; if blank, the source is the same as
        the one shown under the catalog source column.
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Broken into Mag scale and Mag org
    Attribute:
      Attribute_Label: Iefm
      Attribute_Definition: Information: Dots are used in place of blanks to aid in the
        distinction between the columns
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Broken into Intensity, EFF, FPS, and MO
    Attribute:
      Attribute_Label: Dtsvnwg
      Attribute_Definition: Information: Dots are used in place of blanks to aid in the
        distinction between the columns
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Broken into Diastroph., Tsunami, Seiche, Volcanism,
          NonTect, Waves, and Misc.
    Attribute:
      Attribute_Label: Dist
      Attribute_Definition: Radial distance: On radius searches, the distance in
        kilometers between designated input point and earthquake
        location. The distance value is truncated to the whole kilometer.
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: 
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
    Attribute:
      Attribute_Label: Intensity
      Attribute_Definition: Maximum intensity on the Modified Mercalli Intensity Scale
        of 1931 (Wood and Neumann, 1931) or any similar 12-point
        intensity scale. It may also be an MMI value approximated
        from other intensity scales such as Ross-Forel or Japan
        Meteorological Agency. Possible intensity values are 1 - 9;
        X = 10; E = 11; T = 12.
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Range domain: 1 - 9; X = 10; E = 11; T = 12.
    Attribute:
      Attribute_Label: EFF
      Attribute_Definition: Cultural Effects: The most severe effect is listed (C =
        Casualities; D = Damage; F = Felt; H = Heard). Note that
        casualties includes human deaths or injuries. Domestic
        animal casualties are considered to be damage.
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: 
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: A
          Enumerated_Domain_Value_Definition: may mean H - heard
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: C
          Enumerated_Domain_Value_Definition: casualties
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: D
          Enumerated_Domain_Value_Definition: damage
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: F
          Enumerated_Domain_Value_Definition: felt
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: FPS
      Attribute_Definition: Fault Plane Solution: Coded as an "F" to indicate the
        availability of a fault plane solution in the publication,
        "Preliminary Determination of Epicenters, Monthly Listing".
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: 
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: F
          Enumerated_Domain_Value_Definition: Coded as an "F" to indicate the availability of a fault
            plane solution in the publication, "Preliminary
            Determination of Epicenters, Monthly Listing".
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Moment
      Attribute_Definition: Moment Tension Solution: Coded as an "G" to indicate the
        availability of a moment tensor solution in the publication
        "Preliminary Determination of Epicenters, Monthly Listing"
        (Sipkin, 1982; Dziewonski, 1980; and Hanks and others, 1979).
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: 
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: 2
          Enumerated_Domain_Value_Definition: unknown
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: 3
          Enumerated_Domain_Value_Definition: unknown
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: 6
          Enumerated_Domain_Value_Definition: unknown
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: 7
          Enumerated_Domain_Value_Definition: unknown
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: G
          Enumerated_Domain_Value_Definition: Coded as an "G" to indicate the availability of a moment
            tensor solution in the publication "Preliminary
            Determination of Epicenters, Monthly Listing" (Sipkin,
            1982; Dziewonski, 1980; and Hanks and others, 1979).
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: X
          Enumerated_Domain_Value_Definition: International Data Exchange: An "X" in this column
            identifies the event as a "IDE" earthquake
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Diastroph
      Attribute_Definition: Diastrophism
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: 7
          Enumerated_Domain_Value_Definition: Uplift or Subsidence
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: 8
          Enumerated_Domain_Value_Definition: Faulting and Uplift or Subsidence
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: F
          Enumerated_Domain_Value_Definition: Faulting
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: S
          Enumerated_Domain_Value_Definition: Subsidence
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: U
          Enumerated_Domain_Value_Definition: Uplift
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Tsunami
      Attribute_Definition: Tsunami
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: 
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: Q
          Enumerated_Domain_Value_Definition: Questionable tsunami
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: T
          Enumerated_Domain_Value_Definition: Tsunami generated
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Seiche
      Attribute_Definition: Seiche
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: S
          Enumerated_Domain_Value_Definition: Seiche
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Volcanism
      Attribute_Definition: Volcanism
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: V
          Enumerated_Domain_Value_Definition: Earthquake associated with volcanism
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: NonTect
      Attribute_Definition: Non-Tectonic
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: E
          Enumerated_Domain_Value_Definition: Explosion
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: I
          Enumerated_Domain_Value_Definition: Collapse
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Waves
      Attribute_Definition: Guided Waves in Atmospheric And/Or Ocean
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: A
          Enumerated_Domain_Value_Definition: Acoustic wave
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Misc
      Attribute_Definition: Miscellaneous Phenomena
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: .
          Enumerated_Domain_Value_Definition: none
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: L
          Enumerated_Domain_Value_Definition: Liquefaction
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: M
          Enumerated_Domain_Value_Definition: More than one of these phenomena observed.
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: S
          Enumerated_Domain_Value_Definition: Landslides and/or Avalanches
          Enumerated_Domain_Value_Definition_Source: NEIC
          Enumerated_Domain_Value: V
          Enumerated_Domain_Value_Definition: Lights or other visual phenomena seen
          Enumerated_Domain_Value_Definition_Source: NEIC
    Attribute:
      Attribute_Label: Mag_scale
      Attribute_Definition: Magnitude Scale
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Enumerated_Domain: 
          Enumerated_Domain_Value: 0
          Enumerated_Domain_Value_Definition: unknown
          Enumerated_Domain_Value_Definition_Source: none
          Enumerated_Domain_Value: mb
          Enumerated_Domain_Value_Definition: Body-wave (mb): Magnitude values are computed based on the
            seismic-wave period greater than or equal to 0.1 and less
            than or equal to 3.0, and distance is greater than or equal
            to 5 degrees.
          Enumerated_Domain_Value_Definition_Source: Gutenberg and Richter, 1956
          Enumerated_Domain_Value: MD
          Enumerated_Domain_Value_Definition: Duration Magnitudes (MD): These estimates are derived from
            the duration or coda length of earthquake vibrations.
            Duration or coda length magnitude scales are normally
            adjusted to agree with ML or Mn estimates. The MD formulas
            vary for different geographic regions and for different
            seismographic instruments.
          Enumerated_Domain_Value_Definition_Source: Coda-length magnitude
          Enumerated_Domain_Value: ME
          Enumerated_Domain_Value_Definition: Energy Magnitude (Me): These magnitudes are computed from
            the radiated energy using the method described in Choy and
            Boatwright (1995). The energy radiated by an earthquake is
            estimated from the energy spectral density of the broadband
            P waves (Boatwright and Choy, 1986). The Me can complement
            moment magnitudes (Mw) in describing the size of an
            earthquake. Me, being derived from velocity power spectra,
            is a measure of the amount of damage that could be caused.
            Mw, being derived from low-frequency asymptote of
            displacement spectra, is more physically related to the
            final static displacement of an earthquake.
          Enumerated_Domain_Value_Definition_Source: Boatwright and Choy, 1986
          Enumerated_Domain_Value: MI
          Enumerated_Domain_Value_Definition: Felt Area Magnitudes (FA or MI): The estimate is compatible
            with an estimated mb magnitude. It is commonly computed
            from the felt area for earthquakes which occurred before
            seismic instruments were in general use. The estimates are
            based on isoseismal maps or defined areas using
            intensity-attenuation relationships.
          Enumerated_Domain_Value_Definition_Source: Magnitude computed from the epicentral intensity value
          Enumerated_Domain_Value: ML
          Enumerated_Domain_Value_Definition: Local Magnitude (ML): This magnitude is generally referred
            to as the true "Richter magnitude" (originally defined for
            California). The values are computed for distances less
            than 600 km with depths less than 70 km. These estimates
            are computed in the western part of the United States as
            well as world-wide, often using different calibrating functions.
          Enumerated_Domain_Value_Definition_Source: Richter, 1958
          Enumerated_Domain_Value: Ms
          Enumerated_Domain_Value_Definition: Surface-wave (Ms): Magnitudes are computed for earthquakes
            that are located at distances between 20 and 160 geocentric
            degrees from the recording station, seismic-wave period
            between 18 and 22 seconds, and depth is less than 50 km
            (generally Ms magnitudes are not computed for depths
            greater than 50 km.
          Enumerated_Domain_Value_Definition_Source: Bath, 1966
          Enumerated_Domain_Value: Mw
          Enumerated_Domain_Value_Definition: Moment Magnitude (Mw): The magnitude is computed from a
            long-period body- and mantle-wave moment tensor inversion
            method; it is also related to the product of the area of
            the earthquake fault, multiplied by the average fault slip
            over that area and by the shear modulus of the fault rocks.
            The Mw value is approximately the same as the Ms magnitude value.
          Enumerated_Domain_Value_Definition_Source: Hanks and Kanamori, 1979
          Enumerated_Domain_Value: SI
          Enumerated_Domain_Value_Definition: Unknown
          Enumerated_Domain_Value_Definition_Source: none
    Attribute:
      Attribute_Label: Org_source
      Attribute_Definition: Organization Source
      Attribute_Definition_Source: NEIC
      Attribute_Domain_Values:
        Unrepresentable_Domain: Character Field
  Overview_Description:
    Entity_and_Attribute_Overview:
    Entity_and_Attribute_Detail_Citation:
      Catalog Source
      CATALOG SOURCE: (CAT in Screen Format) Contributing source,
      or authority. In the following section, the abbreviation of
      each catalog source is in by parenthesis. The catalog
      abbreviations are listed in alphabetic order. Catalogs
      "supplied by NOAA" came to the NEIC from the National
      Geophysical Data Center of the National Oceanic and
      Atmospheric Administration (Rinehart and others, 1985).
      NOTE:
      Hypocenters and magnitudes of some earthquakes may differ
      from catalog to catalog depending on the earthquake catalog
      from which the information is taken. SIGNIFICANT
      WORLDWIDE EARTHQUAKES (NOAA): This
      catalog is a listing of earthquakes, 2150 B.C. - 1991
      (Paula K. Dunbar, Patricia A. Lockridge, and Lowell S.
      Whiteside, September 1992) supplemented by post-1991 data
      from the USGS/NEIC. The list includes all events that meet
      at least one of the following criteria: 1.
      Moderate damage (approximately $1 million or more)
      2. Ten or more deaths
      3. Magnitude 7.5 or greater
      4. Intensity X or greaterbr> The
      events occurring prior to 1900 were assigned an epicenter
      based on the locations where damage occurred. Magnitudes
      are stated as Ms (Surface Wave) or the equivalent derived
      from intensities for pre-instrumental events. The
      explanation of the codes is listed under the AUTHORITY
      column. USGS/NEIC,
      1973-PRESENT: (PDE)
      Catalog of earthquakes located by the USGS NEIC and its
      predecessors in the U.S. Coast and Geodetic Survey, the
      National Oceanic Survey, and the Environmental Research
      Laboratories of the Department of Commerce. Listings are
      from three different publications: (PDE-W)
      PDE Weekly Listing. This file covers the time period
      following the Monthly data up to four weeks behind the
      current week. The Weekly PDE data are replaced by the
      Monthly PDE data as soon as they become available.
      USGS/NEIC
      Most Recent Events (PDE-Q) Daily listing, known as Quick
      Epicenter Determinatins (QED). These data are extremely
      preliminary and the parameters of the earthquakes are
      subject to change as more data are used to relocate the
      earthquakes. The daily PDE-W covers the time fram following
      the Weekly PDE data up to the current date. These data are
      replaced by the Weekly PDE data. (PDE)
      Preliminary Determinations of Epicenters, Monthly Listing.
      This list is the most complete computation of hypocenters
      and magnitudes done by the USGS NEIC. It is normally
      produced a few months after the events occur. The
      publication is called "Preliminary" because the "final"
      computation of hypocenters for the world is considered to
      be the Bulletin of the Internation Seismological Centre
      (ISC), which is produced about two years after the
      earthquakes occur. The NEIC PDE program contributes about
      one-third off all data used by the ISC. USGS/NEIC
      Most Recent Events (PDE-Q): This
      contains only PDE-Q events described in the previous
      section. SIGNIFICANT
      U.S. EARTHQUAKES (USHIS): A
      catalog of principal earthquakes in the United States, 1568
      - 1989 (Stover, C.W. and Coffman, J. L., 1993). The catalog
      is a history of earthquakes which have magnitudes greater
      than or equal to 4.5 or intensity of VI or larger.
      Exceptions are Alaska and offshore areas of California,
      Oregon, and Washington where only earthquakes having
      magnitudes of 5.5 or larger or intensitites of VI or larger
      are included. It does not include earthquakes in Puerto
      Rico. the Virgin Islands, American Samoa, Guam, or Northen
      Marianas. CALIFORNIA,
      1735 - 1974 (CDMG): compiled
      by Real and others (1978) and Toppozada and others (1984)
      at the California Division of Mines and Geology. This file
      includes hypocenters from catalogs of the Seismological
      Laboratory of the California Institute of Technology (PAS)
      and the Seismological Stations of the University of
      California at Berkeley (BRK). CANADA,
      1568 - 1992 (EPB): compiled
      by the Earth Physics Branch (EPB) of Canada, now the
      Geological Survey of Canada. Also includes U.S. earthquakes
      occurring near the Canadian border. Only the prime
      hypocenters (those selected by EPB/GSC as the best
      solutions for their earthquakes) are entered into the data
      base; in some cases (indicated in the authority column),
      these prime hypocenters may have been computed by an
      institution other than the EPB/GSC. INDIA,
      1063 - 1984 (INDIA): This
      is a combination of four catalogs (Tandon. A.N. and
      Srivastava, H.N., 1974; Chandra, Umesh, 1977; Rao and Rao,
      1984; Srivastava, H.N., and Ramachandran, 1983). See the
      authority column for the catalog identification. The
      ebtries that could be identified as duplicates from the
      four catalogs have been eliminated from the final listing.
      The abbreviations that identify the magnitude source are
      listed in the publication by Rao and Rao, 1984. MEXICO,
      CENTRAL AMERICA, AND CARIBBEAN, 1900 - 1979 (NGDC):
      compiled
      at NOAA (Rinehart and others, 1982). SOUTH
      AMERICA, 1471 - 1981 (SISRA): compiled
      for Proyecto SISRA, Programa para la Mitigacion de los
      Effectos de los Terremotos en la Region Andina (Projeft
      SISRA, Earthquake Mitigation Program in the Andean Region),
      edited by Askew and Algermissen, 1985. EASTERN,
      CENTRAL, AND MOUNTAIN STATES OF THE UNITED STATES, 1534 -
      1986 (SRA): (Stover
      and others, 1984). An early version of the catalog was
      developed under the direction of S.T. Algermissen for the
      contiguous 48 states; updated and revised files have been
      published in a series of Miscellaneous Field Studies Maps.
      The states of Nevada, California, Oregon, Washington,
      Alaska, and Hawaii are not covered in this catalog. Date
      DATE: Year,Month,Day - Year is preceded by a "-" to
      indicate B.C. date. Origin
      Time and Authority
      ORIGIN TIME: (Orig Time in Screen Format) Given in
      Coordinated Universal Time (UTC) AUTHORITY:
      The symbol follows the origin time and refers to the
      organization that supplied the origin time/coordinate
      parameters. Coordinates
      Use decimal degrees. LAT:
      Geographic Latitude. Negative value = South.
      LONG: Geographic Longitude. Negative value = West. Depth
      DEPTH: Value given in kilometers. DEPTH
      CONTROL: (Dep on Screen Format) A
      = Assigned.
      D = Depth restrained based on 2 or more compatible pP
      phases and/or unidentified secondary arrivals used as pP.
      N = Restrained to normal depth (33 km).
      G = Restrained by geophysicist.
      S = Depth control aided by S-phase data.
      % = Questionable value (SSR catalog).
      * = Less reliable depth estimate. Accuracy of depth lies
      between 8.5 km and 16 km based on 90% confidence ellipse.
      ? = Poor depth estimate; depth accuracy is estimated to be
      greater than 16 km based on 90% confidence ellipse.
      Blank = Good depth estimate and depth unrestrained in
      contributed hypocenters from other networks. Depth accuracy
      is estimated to be less than 8.5 km based on 90% confidence
      ellipse. MAGNITUDES
      MAGNITUDES: Magnitude, a logarithmic measure of the "size"
      of an earthquake, is related to the energy released as
      seismic waves at the focus of an earthquake. Although the
      magnitude scale has neither "top" nor "bottom" values, the
      highest magnitude known was about 9.5, the lowest about
      -3.0. On this logarithmic scale, a magnitude 6.0
      shallow-focus earthquake represents elastic-wave energy
      about 30 times larger than that generated by a magnitude
      5.0 earthquake, 900 times (30x30) larger than that of a
      magnitude 4.0 shock. Many
      factors influence the determination of earthquake
      magnitude, including focal depth, distance between
      earthquake focus and observing station, frequency content
      of the sampled energy, and earthquake radiation pattern.
      Magnitude
      values calculated by the USGS with a brief description of
      parameters are shown below (see paragraphs under
      Contributed Magnitudes for appropriate references):
      Surface-wave
      (Ms): Magnitudes are computed for earthquakes that are
      located at distances between 20 and 160 geocentric degrees
      from the recording station, seismic-wave period between 18
      and 22 seconds, and depth is less than 50 km (generally Ms
      magnitudes are not computed for depths greater than 50 km.
      Body-wave
      (mb): Magnitude values are computed based on the
      seismic-wave period greater than or equal to 0.1 and less
      than or equal to 3.0, and distance is greater than or equal
      to 5 degrees. Moment
      Magnitude (Mw): The magnitude is computed from a
      long-period body- and mantle-wave moment tensor inversion
      method; it is also related to the product of the area of
      the earthquake fault, multiplied by the average fault slip
      over that area and by the shear modulus of the fault rocks.
      The Mw value is approximately the same as the Ms magnitude
      value. Energy
      Magnitude (Me): These magnitudes are computed from the
      radiated energy using the method described in Choy and
      Boatwright (1995). The energy radiated by an earthquake is
      estimated from the energy spectral density of the broadband
      P waves (Boatwright and Choy, 1986). The Me can complement
      moment magnitudes (Mw) in describing the size of an
      earthquake. Me, being derived from velocity power spectra,
      is a measure of the amount of damage that could be caused.
      Mw, being derived from low-frequency asymptote of
      displacement spectra, is more physically related to the
      final static displacement of an earthquake. Local
      Magnitudes: Local
      Magnitude (ML): This magnitude is generally referred to as
      the true "Richter magnitude" (originally defined for
      California). The values are computed for distances less
      than 600 km with depths less than 70 km. These estimates
      are computed in the western part of the United States as
      well as world-wide, often using different calibrating
      functions. Local
      or Regional Magnitude (Mn or MbLg): This value is
      calculated for the area of North America east of the Rocky
      Mountains. It is computed from the vertical component
      1-second Lg seismic-waves (short-period surface waves). It
      has also been used in other parts of the world, using
      different calibrating functions. Other
      Magnitudes: Duration
      Magnitudes (MD): These estimates are derived from the
      duration or coda length of earthquake vibrations. Duration
      or coda length magnitude scales are normally adjusted to
      agree with ML or Mn estimates. The MD formulas vary for
      different geographic regions and for different
      seismographic instruments. Felt
      Area Magnitudes (FA or MI): The estimate is compatible with
      an estimated mb magnitude. It is commonly computed from the
      felt area for earthquakes which occurred before seismic
      instruments were in general use. The estimates are based on
      isoseismal maps or defined areas using
      intensity-attenuation relationships. Unknown
      Magnitudes (UK): The computational method was unknown and
      could not be determined from published sources. The
      magnitude section of the earthquake line consists of two
      parts: magnitude values (mb and MS) determined by the
      National Earthquake Information Service (NEIS); and
      Contributed Magnitude values provided by other
      organizations (including NEIS). The headings have the
      following meanings: mb
      = Average NEIS body-wave magnitude. OBS
      = Number of amplitudes used in the mb magnitude
      computation. Ms
      = Average NEIS surface-wave magnitude (if given, Z =
      vertical component, H = horizonatal component). OBS
      = Number of amplitudes used in the surface-wave magnitude
      computation. CONTRIBUTED
      VALUES: Any
      magnitude other than NEIS mb and Ms may show in these
      fields, including some magnitudes computed at NEIS. The
      value may have been calculated from one station or it may
      be an average magnitude value from a number of stations in
      the network. Up to two magnitudes may be given here. The
      second magnitude (if given) is coded on a line immediately
      beneath the first one. The contributed magnitude field
      consists of 11 characters: positions 1-4 = magnitude value;
      positions 5-6 = magnitude scale; and postions 7-11 =
      organization source; if blank, the source is the same as
      the one shown under the catalog source column. A
      number of magnitude scales are defined by source agencies
      or institutions. The magnitude scales in the data base
      include: UK
      = Unknown magnitude scale Ms
      = Surface-wave magnitude; Bath, 1966 mb
      = Body-wave magnitude; Gutenberg and Richter, 1956 ML
      = Local magnitude; Richter, 1958 Mn
      = Nuttli magnitude; Nuttli, 1973 MD
      = Coda-length magnitude FA
      or MI = Felt area magnitude; approximately equivalent to an
      mb value mB
      = Broad-band, body-wave magnitude; Abe (1981, 1982, 1984),
      Abe and Kanamori, 1979, and Abe and Noguchi (1983a,b) Mw
      = Moment magnitude, Hanks and Kanamori, 1979 Mz
      = Magnitude based on the cycles/second of the Sg-phase MI
      = Magnitude computed from the epicentral intensity value K
      = Energy class magnitude value; Kondorskaya and others,
      1982. INFORMATION
      INFORMATION (IEFM DTSVNWG on Screen Search): Dots are used
      in place of blanks to aid in the distinction between the
      columns. Read the sub-headers vertically. Intensity
      (sub-header INT): Maximum
      intensity on the Modified Mercalli Intensity Scale of 1931
      (Wood and Neumann, 1931) or any similar 12-point intensity
      scale. It may also be an MMI value approximated from other
      intensity scales such as Ross-Forel or Japan Meteorological
      Agency. Possible intensity values are 1 - 9; X = 10; E =
      11; T = 12. Cultural
      Effects (sub-header EFF): The
      most severe effect is listed (C = Casualities; D = Damage;
      F = Felt; H = Heard). Note that casualties includes human
      deaths or injuries. Domestic animal casualties are
      considered to be damage. Isoseismal
      Map (sub-header MAP): (Expanded Format only)
      Indicates the publication where an isoseismal map for this
      event has been published. U
      = United States Earthquakes.
      E = Earthquake Notes. (Now Seismological Research Letters)
      P = Preliminary Determination of Epicenters. W
      = Wellington (New Zealand Seismology Reports, Wellington,
      N.Z.).
      N = Nature Magazine.
      S = Bulletin of the Seismological Society of America.
      Fault Plane Solution (sub-header FPS):
      Coded as an "F" to indicate the availability of a fault
      plane solution in the publication, "Preliminary
      Determination of Epicenters, Monthly Listing". Moment
      Tensor Solution (sub-header MO):
      Coded as an "G" to indicate the availability of a moment
      tensor solution in the publication "Preliminary
      Determination of Epicenters, Monthly Listing" (Sipkin,
      1982; Dziewonski, 1980; and Hanks and others, 1979). ISC
      Alternate Depth Indicator (sub-header DEP):
      A "D" in this column indicates that a pP depth is given,
      but the pP depth is not the adopted depth in the hypocenter
      solution. International
      Data Exchange (sub-header IDE):
      An "X" in this column identifies the event as a "IDE"
      earthquake. Preferred
      Solution (sub-header PFD):
      A "P" in this column designates a preferred solution.
      Earthquake hypocenters which are located within a seismic
      network, such as Pasadena or Berkeley, or seismic catalogs
      which have undergone critical review during their
      compilation will be designated as a preferred solution.
      Flag
      (sub-header FLG): Currently not used. PHENOMENA
      Diastrophism: (sub-header D) F
      = Faulting.
      U = Uplift.
      S = Subsidence.
      3 = Uplift and Subsidence.
      4 = Uplift and Faulting.
      5 = Faulting and Subsidence.
      6 = Faulting with Uplift and Subsidence.
      7 = Uplift or Subsidence.
      8 = Faulting and Uplift or Subsidence.
      Tsunami: (sub-header T) T
      = Tsunami generated.
      Q = Questionable Tsunami.
      Seiche: (sub-header S) S
      = Seiche.
      Q = Questionable Seiche.
      Volcanism: (sub-header V) V
      = Earthquake associated with volcanism. Non-Tectonic:
      (sub-header N) E
      = Explosion.
      I = Collapse.
      C = Coal bump or Rockburst in a coal mine.
      R = Rockburst.
      M = Meteoritic.
      N = Either known to be or likely to be of non-tectonic
      origin.
      ? = Classified as an earthquake, but a non-tectonic origin
      cannot be ruled out.
      V = Reservoir induced earthquake.
      Guided Waves in Atmospheric And/Or Ocean: (sub-header W) T
      = T-wave.
      A = Acoustic wave.
      G = Gravity wave.
      B = Both A and G.
      M = T-wave plus and A or G.
      Miscellaneous Phenomena: (sub-header G) L
      = Liquefaction.
      G = Geyser.
      S = Landslides and/or Avalanches.
      B = Sandblows.
      C = Ground cracks not known to be an expression of
      faulting.
      V = Lights or other visual phenomena seen.
      O = Olfactory (Unusual odors noted).
      M = More than one of these phenomena observed.
      Radial Distance
      RADIAL DISTANCE: On radius searches, the distance in
      kilometers between designated input point and earthquake
      location. The distance value is truncated to the whole kilometer.

DISTRIBUTION_INFORMATION

  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: National Earthquake Information Center; World Data Center
        Contact_Person: Madeleine Zirbes
      Contact_Position: 
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 
        City: 
        State_or_Province: 
        Postal_Code: 
        Country: 
      Contact_Voice_Telephone: 
      Contact_Facsimile_Telephone: 
      Contact_Electronic_Mail_Address: zirbes@usgs.gov
      Hours_of_Service: 
  Resource_Description:
  Distribution_Liability:

METADATA_REFERENCE_INFORMATION

  Metadata_Date: 20000825
  Metadata_Review_Date: 
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: 
        Contact_Person: 
      Contact_Position: 
      Contact_Address:
        Address_Type: Mailing and physical address
        Address: 
        City: 
        State_or_Province: 
        Postal_Code: 
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  Metadata_Standard_Name: FGDC CSDGM
  Metadata_Standard_Version: FGDC-STD-001-1998