Metadata:

	Identification_Information

		Citation:

		 	Citation_Information:

				Originator: Nealon, Jeffrey

		 		Publication_Date: 1999

				Title: Seismic Reflection Results from the Gyre 1997 Cruise at the Bryant Canyon of the Louisiana Gulf Coast

		 		Publication_Information:

		 			Publication_Place: Woods Hole, MA

		 		 	Publisher: U.S. Geological Survey

		 		Other_Citation_Details: none

		 		Online_Linkage: none

		Description:

		 	Abstract:

		 		This CD-ROM contains digital high resolution seismic-

		 		reflection data collected during the USGS GYRE 97006

		 		cruise. The coverage is the offshore Louisana continental

		 		slope, Gulf of Mexico. The seismic-reflection data are

		 		stored as IBM 4 bit interger SEG-Y format that can be read and

		 		manipulated by most seismic-processing software. Much

		 		of the information specific to the data are contained

		 		in the headers of the SEG-Y format files. The file system

		 		format is ISO 9660 which can be read with DOS, Unix, and

		 		MAC operating systems with the appropriate CD-ROM driver

		 		software installed. This directory contains the processed 

		 		(using Promax 7.2) and unprossesd (RAW) GI air gun

				data collected on the GYRE 97006 cruise.  These data

		 		were collected using a Seismic Systems Inc. generated

		 		injected (GI) air gun source. On this cruise the GI gun

		 		was configured with two 105 cu. in. chambers, a total

		 		of 210 cu. in. The GI gun works by using one chamber

		 		for a primary pulse and the second chamber injects a

		 		pulse near the maximum expansion of the primary pulse.

		 		This results in a dampening effect on the collapse of

		 		the primary bubble pulse. The data were logged on an

		 		Intel based PC computer (Mudseis system). The data are

		 		two-channel (two traces per shot).

		 	Purpose:

		 		The seismic-reflection data are being archived so that

		 		further digital processing can be done for the seafloor

		 		mapping project: TECTONICS AND SEDIMENTARY PROCESSES OF

		 		THE SALT DEFORMED TEXAS-LOUISIANA CONTINENTAL SLOPE.

		 		This project proposes (1) mapping the surficial geology

		 		of a large part of the TX-LA slope using advanced

		 		processing techniques and existing GLORIA and multibeam

		 		data, (2) conducting a higher resolution sidescan and

		 		sampling cruise to refine the understanding of tectonic,

		 		sediment supply, and oceanographic controls on

		 		sedimentary processes, (3) linking the surficial geology

		 		with the subsurface structures and stratigraphy for

		 		modern and ancient comparison of sedimentary systems,

		 		and (4) integrating data into a three-dimensional model

		 		of depositional systems in this complex environment.

		 Time_Period_of_Content:

		 	Time_Period_Information:

		 		Range_of_Dates/Times:

		 			Beginning_Date: 19970409

		 		 	Beginning_Time: 045227

		 		 	Ending_Date: 19970413

		 		 	Ending_Time: 131459

		 	Currentness_Reference: publication date

		 Status:

		 	Progress: In work

		 	Maintenance_and_Update_Frequency: Unknown

		 Spatial_Domain:

		 	Bounding_Coordinates:

		 		West_Bounding_Coordinate: -92.833333

		 		East_Bounding_Coordinate: -91.916667

		 		North_Bounding_Coordinate: 27.5

		 		South_Bounding_Coordinate: 26.25

		 Keywords:

		 	Theme:

		 		Theme_Keyword_Thesaurus: None

		 		Theme_Keyword: seismic reflection

		 		Theme_Keyword: Seismic Systems Inc.

		 		Theme_Keyword: GI Air Gun

		 		Theme_Keyword: SEG-Y

		 		Theme_Keyword: ISO 9660 CD-ROM

		 	Place:

		 		Place_Keyword_Thesaurus:None

		 		Place_Keyword: Gulf of Mexico

		 		Place_Keyword: Louisiana

		 		Place_Keyword: LA

		 		Place_Keyword: continental slope

		 		Place_Keyword: R/V GYRE

		 		 Access_Constraints: for U.S. Geological 

Survey use only

		 		 Use_Constraints: for U.S. Geological 

Survey use only

		 		 Point_of_Contact:

		 		 		 Contact_Information:

		 		 		 		 

Contact_Person_Primary:

		 		 		 		 		 

Contact_Person: Twichell, Dave

		 		 		 		 		 

Contact_Organization: U.S. Geological Survey

		 		 		 		 

Contact_Position: Seafloor Mapping Project

		 		 		 		 

Contact_Address:

		 		 		 		 		 

Address_Type: mailing address

		 		 		 		 		 

Address:

		 		 		 		 		 		 

U.S. Geological Survey

		 		 		 		 		 		 

Woods Hole Field Center

		 		 		 		 		 		 

384 Woods Hole Road

		 		 		 		 		 		 

Quissett Campus

		 		 		 		 		 

City: Woods Hole

		 		 		 		 		 

State_or_Province: MA

		 		 		 		 		 

Postal_Code: 02543-1598

		 		 		 		 		 

Country: USA

		 		 		 		 

Contact_Voice_Telephone: (508) 548-8700

		 		 		 		 

Contact_Facsimile_Telephone: (508) 457-2310

		 		 		 		 

Contact_Electronic_Mail_Address: dtwichell@usgs.gov

		 		 Data_Set_Credit: 

		 		 		 D. Twichell, D. 

Nichols, T. O'Brien, B. Irwin, V. Cross, M. Taylor

		 		 		 D. Foster, B. Danforth, 

S. Harrison, J. Brand, C. Spagnuolo

		 		 Native_Data_Set_Environment: ISO 9660

		 Data_Quality_Information:

		 		 Attribute_Accuracy:

		 		 		 

Attribute_Accuracy_Report:

		 		 		 

Quantitative_Attribute_Accuracy_Assessment:

		 		 		 		 

Attribute_Accuracy_Value:

		 		 		 		 

Attribute_Accuracy_Explanation:

		 		 Logical_Consistency_Report:

		 		 Completeness_Report: archive of SEG-Y 

format seismic data

		 		 Positional_Accuracy:

		 		 		 

Horizontal_Positional_Accuracy:

		 		 		 		 

Horizontal_Positional_Accuracy_Report:

		 		 		 		 		 

The ship was navigated with differential GPS

		 		 		 		 		 

The GI air gun was towed 10 m aft of the ship

		 		 		 		 		 

The two-channel streamer was towed 100 m aft of the

		 		 		 		 		 

ship. Each channel consisted of a 25 m length

		 		 		 		 		 

of streamer.

		 		 		 		 

Quantitative_Horizontal_Positional_Accuracy_Assessment:

		 		 		 		 		 

Horizontal_Positional_Accuracy_Value: 5-10 meters

		 		 		 		 		 

Horizontal_Positional_Accuracy_Explanation:

		 		 		 		 		 		 

the ship position is accurate within 5-10 meters

		 		 		 

Vertical_Positional_Accuracy:

		 		 		 		 

Vertical_Positional_Accuracy_Report:

		 		 		 		 		 

The air gun was towed at depth of 1 meter. The

		 		 		 		 		 

streamer was towed at a depth of 5 meters. Vertical

		 		 		 		 		 

resolution of the seismic data is about 1-2 meters.

		 		 		 		 		 

There was no correction to a datum such as mean sea

		 		 		 		 		 

level.

		 		 		 		 

Quantitative_Vertical_Positional_Accuracy_Assessment:

		 		 		 		 		 

Vertical_Positional_Accuracy_Value: 1-2 meters

		 		 		 		 		 

Vertical_Positional_Accuracy_Explanation:

		 		 Lineage:

		 		 		 Source_Information

		 		 		 		 

Source_Citation

		 		 		 		 		 

Citation_Information:

		 		 		 		 		 		 

Originator: Twichell, David C.

		 		 		 		 		 		 

Publication_Date: 1997

		 		 		 		 		 		 

Title:

		 		 		 		 		 		 

Geospatial_Data_Presentation_form:

		 		 		 		 

Source_Scale_Denomonator:

		 		 		 		 

Type_of_Source_Media: Seg-Y files on CDROM

		 		 		 		 

Source_time_preiod_of_Content:

		 		 		 		 		 

Time_preiod_of_Iinformation:

		 		 		 		 		 		 

Single_Date/Time:

		 		 		 		 		 		 		 

Calendar_date: 1997

		 		 		 		 		 

Souce_Currentness_Reference:

		 		 		 		 

Source_Citation_Abbrevaition: USGS

		 		 		 Process_Step:

		 		 		 		 

Process_Description:

		 		 		 		 		 

Flow 1 : load file and geometry 

    		 		 		 		 		 		 

2D Marine geometry spreadsheet 

    		 		 		 		 		 		 

Seg-Y Input 

            		 		 		 		 		 		 

File to input: Raw.seg-y 

            		 		 		 		 		 		 

Store Processing History:Yes 

            		 		 		 		 		 		 

Input Auxiliary Traces: Yes 

            		 		 		 		 		 		 

Get Channel Number from Trace Headers: Yes 

            		 		 		 		 		 		 

Input Trace Format:  Get from Headers 

            		 		 		 		 		 		 

Display ensemble Formation:  No 

            		 		 		 		 		 		 

Data Input Sample Rate:   0.5 msec 

            		 		 		 		 		 		 

Maximum Time to input: variable 

            		 		 		 		 		 		 

Is this Stacked Data:   No 

            		 		 		 		 		 		 

Max Traces Per Ensemble: 120 

            		 		 		 		 		 		 

Primary Sort Header Word: SHOT 

            		 		 		 		 		 		 

Input Primary Selection Choice:Input all 

            		 		 		 		 		 		 

Input secondary selection Choice:None 

            		 		 		 		 		 		 

Input global XY coordinates: No 

            		 		 		 		 		 		 

Use coordinate Scalar: Yes 

            		 		 		 		 		 		 

Remap Seg-Y header Values:  No 

    		 		 		 		 		 		 

Inline Geometry header Load 

            		 		 		 		 		 		 

water velocity:  1525 

            		 		 		 		 		 		 

Primary header to match database: FFID 

            		 		 		 		 		 		 

Secondary Header to match database: None 

            		 		 		 		 		 		 

Match by Valid trace Number: NO 

            		 		 		 		 		 		 

Drop traces with Null CDP headers:  No 

            		 		 		 		 		 		 

Drop Traces with Null receiver Headers: No 

            		 		 		 		 		 		 

Verbose Diagnostics: YES 

    		 		 		 		 		 		 

Trace header Math 

         		 		 		 		 		 		 

select Mode:fixed equation Mode 

              		 		 		 		 		 		 

define header equation:FFID =CDP 

    		 		 		 		 		 		 

Disk Data Output 

         		 		 		 		 		 		 

output dataset file Name: geom 

            		 		 		 		 		 		 

New or existing file:New 

            		 		 		 		 		 		 

record length to output:0(default parameter means include all) 

            		 		 		 		 		 		 

Trace sample format:16 bit 

            		 		 		 		 		 		 

Skip primary disk storage:No 

		 		 		 		 		 

Flow 2: Mute and Deconvolution 

    		 		 		 		 		 		 

Disk Data Input 

          		 		 		 		 		 		 

Read data from other lines/surveys:No 

                		 		 		 		 		 

Select input file: geom 

                		 		 		 		 		 

Trace read option: Get all 

                		 		 		 		 		 

Read data multiple times: No 

                		 		 		 		 		 

Input trace headers only: No 

                		 		 		 		 		 

Override input datas sample interval:No 

    		 		 		 		 		 		 

Trace Muting 

               		 		 		 		 		 		 

Reapply Previous mutes: no 

                		 		 		 		 		 

Mute time reference:Time 0 

                		 		 		 		 		 

Type of Mute: TOP 

                		 		 		 		 		 

Starting ramp:30 

                		 		 		 		 		 

Extrapolate mute times:No 

                		 		 		 		 		 

Get Mute Times from Database:Yes 

                 		 		 		 		 		 

Select Database:Topmute(Horizon picked ~300 ms above seafloor) 

    		 		 		 		 		 		 

True Amplitude recovery 

                		 		 		 		 		 

Apply spherical divergence corrections: NO 

                		 		 		 		 		 

Apply inelastic attenuation correction: NO 

                		 		 		 		 		 

Apply db/sec corrections:YES 

                         		 		 		 		 

DB per second constant:6 

                		 		 		 		 		 

Apply time raise to a power corrections:NO 

                           		 		 		 		 

Time power constant:NO 

                		 		 		 		 		 

Apply effect to data or remove function:APPLY 

                		 		 		 		 		 

Maximum application Time: 3500-4000 

    		 		 		 		 		 		 

Spiking Predictive decon 

                		 		 		 		 		 

Type of deconvolution:MIN PHASE SPIKING 

                		 		 		 		 		 

Decon Operator length:80 

                		 		 		 		 		 

Operator white noise level:.1 

                		 		 		 		 		 

window rejection length:2 

                		 		 		 		 		 

Time gate reference:DATABASE FILE 

                		 		 		 		 		 

Select decon gate from Database: 

Yes             		 		 		 		 		 		 		 		 		 		 

Select database:DECON 

                		 		 		 		 		 

Output traces or filters:TRACES 

                		 		 		 		 		 

Apply a band pass filter after decon:NO 

                 		 		 		 		 		 

Reapply mutes after decon:YES 

   		 		 		 		 		 		 

Disk Data Output 

         		 		 		 		 		 		 

Output dataset file Name:decon 

            		 		 		 		 		 		 

New or existing file:New 

            		 		 		 		 		 		 

record length to output:0(default parameter means include all) 

            		 		 		 		 		 		 

Trace sample format:16 bit 

            		 		 		 		 		 		 

Skip primary disk storage:No 

		 		 		 		 		 

Flow 3 Stack 

   		 		 		 		 		 		 

Disk Data Input 

            		 		 		 		 		 		 

Read data from other lines/surveys: No 

            		 		 		 		 		 		 

Select input file:decon 

            		 		 		 		 		 		 

Trace read option:sort 

                     		 		 		 		 		 

Primary Sort header word:CDP 

                    		 		 		 		 		 

Secondary sort header word:NONE 

                   		 		 		 		 		 

Sort order dataset:*/ 

                    		 		 		 		 		 

Presort in memory or disk:Memory 

            		 		 		 		 		 		 

Read data multiple times:No 

            		 		 		 		 		 		 

Input trace headers only: No 

           		 		 		 		 		 		 

Override input datas sample interval:No 

    		 		 		 		 		 		 

CDP Ensemble Stack 

             		 		 		 		 		 		 

sort order of input ensembles:CDP 

             		 		 		 		 		 		 

Method of trace summing:Mean 

             		 		 		 		 		 		 

root Power scalar for stack normalization:0.5 

              		 		 		 		 		 		 

Apply final datum statics after Stack:Yes 

            		 		 		 		 		 		 

Has NMO been applied:No 

    		 		 		 		 		 		 

Disk Data Output 

         		 		 		 		 		 		 

Output dataset file Name:stack 

            		 		 		 		 		 		 

New or existing file:New 

            		 		 		 		 		 		 

record length to output:0(default parameter means include all) 

            		 		 		 		 		 		 

Trace sample format:16 bit 

            		 		 		 		 		 		 

Skip primary disk storage:No 

     		 		 		 		 		 		 

Disk Data Input 

            		 		 		 		 		 		 

Read data from other lines/surveys:No 

            		 		 		 		 		 		 

Select input file:stack 

            		 		 		 		 		 		 

Trace read option:get all 

            		 		 		 		 		 		 

Read data multiple times:No 

            		 		 		 		 		 		 

Input trace headers only:No 

           		 		 		 		 		 		 

Override input data's sample interval:No 

    		 		 		 		 		 		 

Bandpass Filter 

        		 		 		 		 		 		 

Type of Filter:single filter 

        		 		 		 		 		 		 

Type of filter specification:ormsby bandpass 

         		 		 		 		 		 		 

Phase of filter:Zero 

        		 		 		 		 		 		 

domain of filter application:Frequency 

         		 		 		 		 		 		 

Percent zero padding for FFT:25 

        		 		 		 		 		 		 

Apply notch filter:no 

        		 		 		 		 		 		 

Ormbsby bandpass filter values:4-8-100-150 

        		 		 		 		 		 		 

Reapply trace mute after filter:yes 

    		 		 		 		 		 		 

Seg-Y Output 

        		 		 		 		 		 		 

type of seg-y:standard 

               		 		 		 		 		 		 

file name:line1pro.sgy 

        		 		 		 		 		 		 

Retrieve history form header:yes 

        		 		 		 		 		 		 

copy reel header:default 

        		 		 		 		 		 		 

job id for binary header:9999 

        		 		 		 		 		 		 

line number for binary header:9999 

        		 		 		 		 		 		 

desired trace format:4 bit integer 

        		 		 		 		 		 		 

maximum time to output:variable 

        		 		 		 		 		 		 

remap seg-y header values:no 

		 Spatial_Data_Organization_Information:

		 		 Indirect_Spatial_Reference: Gulf of 

Mexico, Louisiana Continental Slope

		 		 Direct_Spatial_Reference_Method: raster

		 		 Raster_Object_Information:

		 		 		 Raster_Object_Type: 

Voxel

		 		 		 		 

Row_Count: > 10000

		 		 		 		 

Column_Count: 1

		 		 		 		 

Vertical_Count: 4096

		 Spatial_Reference_Information: 

		 		 Horizontal_Coordinate_System_Definition: 

		 		 		 Planar: 

		 		 		 		 

Grid_Coordinate_System:

		 		 		 		 		 

Grid_Coordinate_System_Name

		 		 		 		 		 

Universal_Transverse_Mercator:

		 		 		 		 		 		 

UTM_Zone_Number: 15

		 		 		 		 		 		 

Transverse_Mercator:

		 		 		 		 		 		 		 

Scale_Factor_at_Central_Meridian: .9997

		 		 		 		 		 		 		 

Longitude_of_Central_Meridian: -93

		 		 		 		 		 		 		 

Latitude_of_Projection_Origin: 0

		 		 		 		 		 		 		 

False_Easting: 0

		 		 		 		 		 		 		 

False_Northing: 0

		 		 		 		 

Planar_Coordinate_Information:

		 		 		 		 		 

Planar_Coordinate_Encoding_Method: coordinate pair

		 		 		 		 		 

Coordinate_Representation:

		 		 		 		 		 		 

Abscissa_Resolution: 5

		 		 		 		 		 		 

Ordinate_Resolution: 5

		 		 		 		 		 

Planar_Distance_Units: meters

		 		 		 Geodetic_Model: 

		 		 		 		 

Horizontal_Datum_Name: North American Datum of 1983

		 		 		 		 

Ellipsoid_Name: Geodetic Reference System 80

		 		 		 		 

Semi-major_Axis: 6378137

		 		 		 		 

Denominator_of_Flattening_Ratio: 298257

		 		 Vertical_Coordinate_System_Definition:

		 		 		 

Altitude_System_Definition:

		 		 		 		 

Altitude_Datum_Name: assumed sea level

		 		 		 		 

Altitude_Resolution: 1

		 		 		 		 

Altitude_Distance_Units: two-way travel time

		 		 		 		 

Altitude_Encoding_Method: Attribute values

		 		 		 Depth_System_Definition:

		 		 		 		 

Depth_Datum_Name: fish depth below sea level (local surface)

		 		 		 		 

Depth_Resolution:  1

		 		 		 		 

Depth_Distance_Units: meters

		 		 		 		 

Depth_Encoding_Method: Attribute values

		 Entity_and_Attribute_Information:

		 		 Overview_Description:

		 		 		 

Entity_and_Attribute_Overview:

		 		 		 

Entity_and_Attribute_Detail_Citation:

		 Distribution_Information:

		 		 Distributor:

		 		 		 Contact_Information:

		 		 		 		 

Contact_Person_Primary:

		 		 		 		 		 

Contact_Person: Soderberg, Nancy

		 		 		 		 		 

Contact_Organization: U.S. Geological Survey

		 		 		 		 

Contact_Position: Data Library

		 		 		 		 

Contact_Address:

		 		 		 		 		 

Address_Type: mailing address

		 		 		 		 		 

Address:

		 		 		 		 		 		 

U.S. Geological Survey

		 		 		 		 		 		 

Woods Hole Field Center

		 		 		 		 		 		 

384 Woods Hole Road

		 		 		 		 		 		 

Quissett Campus

		 		 		 		 		 

City: Woods Hole

		 		 		 		 		 

State_or_Province: MA

		 		 		 		 		 

Postal_Code: 02543-1598

		 		 		 		 		 

Country: USA

		 		 		 		 

Contact_Voice_Telephone: (508) 548-8700

		 		 		 		 

Contact_Facsimile_Telephone: (508) 457-2310

		 		 		 		 

Contact_Electronic_Mail_Address: nsoderberg@usgs.gov

		 		 Resource_Description: U.S. Geological 

Suvey Internal CD-ROM Data Archive

		 		 Distribution_Liability:

		 		 		 This Compact Disc-Read 

Only Memory (CD-ROM) publication

		 		 		 was prepared by an 

agency of the United States Government.

		 		 		 Neither the United 

States Government nor any agency thereof,

		 		 		 nor any of their 

employees, make any warranty, expressed

		 		 		 or implied, or assumes 

any legal liability or responsibility

		 		 		 information, apparatus, 

product, or process disclosed in

		 		 		 this report, or 

represents that its use would not infringe

		 		 		 privately owned rights. 

Reference therein to any specific

		 		 		 commercial product, 

process, or service by trade name,

		 		 		 trademark, 

manufacturer, or otherwise does not necessarily

		 		 		 constitute or imply its 

endorsement, recommendation, or

		 		 		 favoring by the United 

States Government or any agency thereof.

		 		 		 Any views and opinions 

of authors expressed herein do not

		 		 		 necessarily  state  or 

reflect those of the United States

		 		 		 Government or any 

agency thereof. Although all data published

		 		 		 on this CD-ROM have 

been used by the USGS, no warranty,

		 		 		 expressed or implied, 

is made by the USGS as to the accuracy

		 		 		 of the data and related 

materials and/or the functioning of

		 		 		 the software.  The act 

of distribution shall not constitute

		 		 		 any such warranty, and 

no responsibility is assumed by the

		 		 		 USGS in the use of this 

data, software, or related materials.

		 		 Standard_Order_Process:

		 		 		 Digital_Form:

		 		 		 		 

Digital_Transfer_Information:

		 		 		 		 		 

Format_Name: ISO 9660 CD-ROM

		 		 		 		 		 

Format_Version_Number: ISO 9660

		 		 		 		 		 

Format_Specification: 

		 		 		 		 		 

Format_Information_Content: SEG-Y

		 		 		 		 		 

File_Decompression_Technique: none

		 		 		 		 		 

Transfer_Size: 650 MB

		 		 		 		 

Digital_Transfer_Option:

		 		 		 		 		 

Offline_Option:

		 		 		 		 		 		 

Offline_Media: CD-ROM

		 		 		 		 		 		 

Recording_Capacity: 650 MB

		 		 		 		 		 		 		 

Recording_Density: 512

		 		 		 		 		 		 		 

Recording_Density_Units: bytes		 

		 		 		 		 		 		 

Recording_Format: ISO 9660

		 		 		 		 		 		 

Compatibility_Information: UNIX, DOS, MAC

		 		 

		 		 		 Fees:

		 Metadata_Reference_Information:

		 		 Metadata_Date: 19970408

		 		 Metadata_Contact:

		 		 		 Contact_Information:

		 		 		 		 

Contact_Person_Primary:

		 		 		 		 		 

Contact_Person: Foster, David

		 		 		 		 		 

Contact_Organization: U.S. Geological Survey

		 		 		 		 

Contact_Position: Geophysics Group

		 		 		 		 

Contact_Address:

		 		 		 		 		 

Address_Type: mailing address

		 		 		 		 		 

Address:

		 		 		 		 		 		 

U.S. Geological Survey

		 		 		 		 		 		 

Woods Hole Field Center

		 		 		 		 		 		 

384 Woods Hole Road

		 		 		 		 		 		 

Quissett Campus

		 		 		 		 		 

City: Woods Hole

		 		 		 		 		 

State_or_Province: MA

		 		 		 		 		 

Postal_Code: 02543-1598

		 		 		 		 		 

Country: USA

		 		 		 		 

Contact_Voice_Telephone: (508) 548-8700

		 		 		 		 

Contact_Facsimile_Telephone: (508) 457-2310

		 		 		 		 

Contact_Electronic_Mail_Address: dfoster@usgs.gov

		 		 Metadata_Standard_Name: FGDC Content 

Standard

		 		 Metadata_Standard_Version: 19940608

		 		 Metadata_Time_Convention: universal time

		 		 Metadata_Access_Constraints: none

		 		 Metadata_Use_Constraints: none