DISCLAIMER -- THIS IS NOT AN EARTHQUAKE PREDICTION OR WARNING!
  The commentary provided with these map(s) is for INFORMATIONAL
USE ONLY, and SHOULD NOT be construed as an earthquake prediction,
warning, or advisory.  Responsibility for such warnings rests with
the Office of Emergency Services of the State of California.
PLEASE REMEMBER -- THESE ARE PRELIMINARY DATA
  Releasing these summaries on a timely basis requires that the
data, analysis, and interpretations presented are PRELIMINARY. Of
necessity they can only reflect the views of the seismologists who
prepared them, and DO NOT carry the endorsement of the U.S.G.S.
Thus while every effort is made to ensure that the information is
accurate, nothing contained in this report is to be construed as
and earthquake prediction, warning, advisory, or official policy
statement of any kind, of the U.S. Geological Survey, or the
U.S. Government.
FOR QUESTIONS CONCERNING THIS REPORT
  Send e-mail to michael@andreas.wr.usgs.gov
  DO NOT SEND EMAIL TO weekly@garlock.wr.usgs.gov  It will not be read.

Seismicity Report for Northern California,
the Nation, and the World for the week of
July 17- 23, 1997

 Stephen R. Walter
U.S. Geological Survey
345 Middlefield Rd.  MS-977, Menlo Park, CA  94025

San Francisco Bay Area               
  
   During the seven-day period ending at midnight on Wednesday,
July 23, 1997 the U.S. Geological Survey office in Menlo Park
recorded 16 earthquakes of magnitude one (M1) and greater within
the San Francisco Bay area shown in Figure 1.  Only one was as
large as M2.0.   This total compares to 13 earthquakes during the
prior seven-day period (July 10 - 16), one of which was as large
as M2.
  The only notable earthquake of the week occurred just after noon
last Thursday and was mentioned in last week's summary.  The M4.1
earthquake occurred close to the southern end of the Sargent
fault, about three miles southwest of Gilroy (#1/1).  It was felt
throughout the San Jose area, as far north as Redwood City, and
south at least as far as Salinas.  No damage was reported from the
earthquake.  Five small (M1) aftershocks had occurred over the
next two days, the largest a M1.8 just before noon on Saturday.
  The only other earthquake of note was a M1.8 on the northern
Concord fault late Monday morning (#2/1).    
   
Northern & Central California
	
  Activity during the past week was centered primarily in the
northern part of the state.  The week began with a M2.4 last
Thursday evening in the northern Sacramento Valley about eight
miles east of Redding (#1/2).  It was followed by a pair of M2.3
shocks over the next four days, the first late Sunday night, the
second late Tuesday afternoon.  A cluster of five M2 earthquakes
occurred northeast of Cottonwood over a 27 hour period beginning
early Saturday morning (#2/2).  Activity on the Mendocino fracture
zone included a pair of M2's just west of Petrolia and a M3.3 on
Wednesday that was located about 14 miles west of the town (#4/2). 
On Monday afternoon a M3.5 occurred near the coast about 14 miles
southwest of Eureka (#8/2).  the following day a 25-km-deep M4.0
earthquake occurred beneath the central Klamath Mountains about 25
miles west of Weaverville (#9/2).  It was reported felt at Blue
Lake and Willow Creek.  
   Activity in the central Coast Range was limited to a pair of
M2's at the Geysers, the largest a M2.7 (#3/2), and a M2.8 near
the San Andreas fault about three miles southeast of Point Arena
(#5/2). 
   The only earthquakes as large as M2 in central California were
a M2.0 on the San Andreas just north of The Pinnacles National
Monument (#1/2) and a M2.2 in the southern Sierra Nevada about 18
miles southeast of Porterville (#6/2).

Long Valley Caldera
The activity along the southwest side of the resurgent dome that
began on July 8 declined to just two events as large as M1.5, the
largest a M2.1 on Wednesday evening (3/3).  To the east a cluster
of small earthquakes occurred last Thursday near the Fish
Hatchery, the largest of these a M3.4 that may have been felt
locally (#1/3).  
   The only earthquake of note south of the caldera was a M2.3
south of Mt. Morrison (#2/3).
  
USA Seismicity (July 15 - 22)
  
   Data provided by the National Earthquake Information Center
showed a fairly quiet week in the lower 48 states.  Outside of
California the largest earthquake reported was a M3.5 along the
Tennessee/Georgia border (#2/4).  Other earthquakes of note:  a
M2.6 in the Oregon Cascade Mountains just northwest of Mt.
Jefferson (#1/4) and a M2.8 in the Seattle area (#3/4).   

The Planet Earth  (July 15 - 22)

   For a change the eastern Pacific margin was most active during
the past week.  A M5.8 near the coast of central Chile was widely
felt in the vicinity, as was a M5.5 aftershock (#1/5).  To the
northeast, a M6.0 occurred along the Argentina/Bolivia border that
was felt as far away as the northern Chilean coastal towns of
Antofagasta and Tocopilla (#4/5).  The largest earthquake of the
week occurred off the coast of Guerrero, Mexico that was felt in
Guerrero and Oaxaca and as far away as Mexico City (#2/5). 

Table 1. Northern & Central California Seismicity (M>1.0)

--ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH  N N RMS ERH ERZ       DUR
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG

97 JUL 17  715 21.69 37 36.72 118 48.61  5.70  7   .04  .6 1.3 HCF   1.3
97 JUL 17 1017  0.00 37 30.50 118 51.14  6.05  9   .05 1.0 1.5 MOR   1.2
97 JUL 17 1201  4.75 37 28.32 118 47.03 10.85 18   .06  .7  .8 MOR   1.5
97 JUL 17 1238 48.74 36 38.49 121 15.30  4.28 37   .06  .2  .5 STN   2.0
97 JUL 17 1355  2.12 37 38.15 118 51.55  5.60 15   .08  .4  .6 SMO   1.6

97 JUL 17 1359 36.79 37 38.25 118 51.61  5.42 14   .08  .4  .6 SMO   1.4
97 JUL 17 1403 10.17 37 38.21 118 51.51  5.52 14   .07  .4  .6 SMO   1.4
97 JUL 17 1406 10.51 37 38.20 118 51.69  5.40 23   .07  .3  .5 SMO   2.0
97 JUL 17 1412  2.00 37 38.20 118 51.55  5.47 18   .07  .3  .6 SMO   1.5
97 JUL 17 1412 36.07 37 38.10 118 51.52  1.86 13   .08  .3  .5 SMO   2.1

97 JUL 17 1427 33.28 37 38.46 118 51.15  6.15  7   .02  .5 1.2 SMO   1.0
97 JUL 17 1440 55.81 37 37.85 118 52.09  2.91 31   .26  .5 1.2 SMO   2.3
97 JUL 17 1442  4.18 37 38.23 118 51.48  5.59 19   .06  .3  .5 SMO   1.7
97 JUL 17 1456 10.03 37 38.48 118 51.23  6.37 12   .02  .4  .7 SMO   1.5
97 JUL 17 1501 33.45 37 38.06 118 51.67  5.57 18   .06  .3  .5 SMO   1.6

97 JUL 17 1514 55.19 37 30.88 118 51.25  5.67  7   .05 1.5 2.1 MOR   1.0
97 JUL 17 1555 56.60 37 38.13 118 51.78  5.38 26   .09  .3  .4 SMO   2.3
97 JUL 17 1628  4.97 38 46.49 122 44.93  2.22  9   .03  .4  .6 GEY   1.4
97 JUL 17 1643 53.65 37 38.15 118 51.56  5.61 17   .07  .3  .5 SMO   1.6
97 JUL 17 1803 46.61 37 35.19 118 46.94  0.00  9   .47 2.2 1.6 MOR # 1.0

97 JUL 17 1826 50.78 37 38.32 118 51.57  5.17 14   .07  .4  .6 SMO   1.5
97 JUL 17 1946 37.24 36 57.88 121 35.82  7.41 89   .15  .2  .5 SAR   3.9
97 JUL 17 1952 50.03 36 58.08 121 35.98  5.68 12   .07  .3  .5 SAR   1.4
97 JUL 17 2007 17.45 36 57.84 121 35.62  5.63  9   .06  .4  .6 SAR   1.1
97 JUL 17 2016  0.70 38 48.54 122 48.88  3.76  8   .02  .4  .6 GEY   1.3

97 JUL 17 2035 48.72 37 39.54 118 55.80  7.73 17   .05  .4  .7 SMO   1.4
97 JUL 17 2142 48.02 36 58.24 121 35.92  5.85 17   .13  .3  .7 SAR   1.3
97 JUL 17 2207  3.75 37 38.59 118 51.41  6.32  7   .02  .5 1.7 SMO   1.4
97 JUL 17 2258 34.52 36 58.08 121 35.64  5.52 20   .11  .3  .6 SAR   1.4
97 JUL 17 2352 25.62 36 39.08 121  6.53 10.06 14   .11  .4  .9 BVL   1.3

97 JUL 18   51 28.84 37 38.09 118 51.89  5.59 33   .08  .3  .4 SMO   3.1
97 JUL 18  137  0.21 37 38.39 118 51.90  4.80 27   .06  .2  .4 SMO   2.7
97 JUL 18  139 15.31 37 38.51 118 51.24  6.00 10   .02  .5  .9 SMO   1.4
97 JUL 18  146 11.57 37 38.27 118 51.61  5.16 19   .07  .3  .5 SMO   1.6
97 JUL 18  231 58.77 37 38.48 118 51.31  6.08 12   .02  .4  .8 SMO   1.2

97 JUL 18  402 26.51 37 38.25 118 51.53  4.97 15   .07  .4  .6 SMO   1.4
97 JUL 18  649 55.64 37 34.27 118 50.40  7.23 11   .03  .5  .8 MOR   1.1
97 JUL 18  708  8.44 37 25.28 118 36.30  5.35  7   .1412.110.6 RVL - 1.2
97 JUL 18  811 24.85 37 38.16 118 51.22  5.46 12   .07  .4  .6 SMO   1.4
97 JUL 18 1027 34.51 37 38.30 118 51.81  4.75 14   .06  .4  .6 SMO   1.3

97 JUL 18 1046 22.01 37 38.27 118 54.08  8.43  7   .11 1.4 2.1 SMO   1.3
97 JUL 18 1142 30.35 38 48.79 122 48.45  0.16 10   .07  .3 1.4 GEY # 1.5
97 JUL 18 1150 46.81 37 38.28 118 51.87  5.08 25   .07  .3  .4 SMO   1.9
97 JUL 18 1153 35.28 37 35.29 118 48.13 22.82  7   .09 1.8 8.3 MOR - 1.2
97 JUL 18 1154 24.49 37 38.46 118 51.34  6.25 11   .03  .5  .8 SMO   1.3

--ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH  N N RMS ERH ERZ       DUR
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG

97 JUL 18 1324 29.46 40  2.01 123 45.04 14.54  7   .10 2.0 1.2 MAA   1.8
97 JUL 18 1325 39.67 37 38.25 118 51.64  5.10 18   .06  .3  .5 SMO   1.5
97 JUL 18 1539 58.84 38 49.11 122 48.62  4.19 10   .02  .3  .6 GEY   1.5
97 JUL 18 1740 14.75 38 46.95 122 45.75  1.97  7   .07  .4 1.1 GEY   1.1
97 JUL 18 1922 36.22 38 49.36 122 47.57  3.90  8   .02  .3  .8 GEY   1.4

97 JUL 18 1958 27.55 37 38.25 118 51.70  5.51 14   .06  .4  .6 SMO   1.3
97 JUL 18 2026 58.52 36 57.81 121 35.40  6.27  9   .06  .5  .6 SAR   1.0
97 JUL 18 2103 22.20 38 47.89 122 46.96  1.03  8   .02  .3  .5 GEY   1.5
97 JUL 19   30 47.88 38 49.25 122 47.63  4.04  8   .02  .3  .8 GEY   1.3
97 JUL 19  335 41.90 37 33.15 118 44.87  8.92 15   .04  .3  .9 WCN   1.5

97 JUL 19  510  7.16 40 34.13 122 13.83 18.73 18   .22  .6 1.3 SHA   2.4
97 JUL 19  607 17.50 37 38.50 118 51.23  6.31  7   .01  .5 1.1 SMO   1.0
97 JUL 19  609  4.87 37 38.41 118 51.75  4.99 10   .07  .4  .8 SMO   1.0
97 JUL 19  658  6.56 37 38.52 118 51.45  7.25  8   .03  .7 1.5 SMO   1.4
97 JUL 19  658 27.67 37 38.32 118 51.72  5.35 16   .07  .4  .6 SMO   1.7

97 JUL 19  725 32.33 38 49.70 122 48.14  3.52  7   .02  .4  .9 GEY   1.1
97 JUL 19  754 11.64 36 57.96 121 35.71  5.92 15   .07  .3  .5 SAR   1.4
97 JUL 19 1036 56.19 40 24.62 122  6.85  3.32 15   .10  .3 1.7 SHA   2.4
97 JUL 19 1230 52.62 37 38.52 118 51.45  6.32  9   .02  .4  .9 SMO   1.0

97 JUL 19 1359 47.96 38 47.62 122 44.47  2.20 16   .06  .2  .6 GEY   2.0
97 JUL 19 1417 43.61 37 29.21 118 52.07  6.59 18   .05  .5  .5 MOR   1.7
97 JUL 19 1452 10.97 37 38.97 118 54.71  8.06 10   .04  .7 1.3 SMO   1.0
97 JUL 19 1538  4.11 38 56.07 123  4.70  5.54  8   .04  .4 1.8 MAA   1.4
97 JUL 19 1615 52.82 37 38.80 118 54.51  7.91 14   .04  .4  .8 SMO   1.2

97 JUL 19 1620 36.94 37 38.24 118 51.98  5.29 27   .09  .3  .4 SMO   1.7
97 JUL 19 1623 13.21 37 38.50 118 51.51  5.93 16   .04  .3  .6 SMO   1.5
97 JUL 19 1630  9.98 37 38.91 118 54.56  8.28 14   .04  .4  .9 SMO   1.3
97 JUL 19 1708 44.10 40 23.03 122  6.07  0.25 17   .26  .7 9.9 SHA # 2.3
97 JUL 19 1720 32.54 40 22.50 122  5.48  7.88 13   .18  .5 2.8 SHA   2.0

97 JUL 19 1811 33.67 36 57.84 121 35.61  6.46 41   .13  .3  .6 SAR   1.8
97 JUL 19 1825 49.24 37 38.94 118 54.61  8.09 21   .07  .3  .6 SMO   1.8
97 JUL 19 1827 21.23 37 38.78 118 54.83  7.51  9   .04  .6 1.0 SMO   1.0
97 JUL 19 1832 11.24 37 39.12 118 54.39  8.84 14   .03  .5  .7 DOM   1.2
97 JUL 19 1902 37.45 37 39.09 118 54.44  8.66 11   .04  .8 1.3 DOM   1.0

97 JUL 19 1918 18.23 38 50.79 122 47.67  1.60 19   .05  .2  .6 GEY   2.7
97 JUL 19 1954 20.27 37 38.26 118 51.67  5.34 20   .06  .3  .5 SMO   1.6
97 JUL 19 2121 44.35 37 39.32 118 54.33  4.82 17   .08  .3  .6 DOM   1.4
97 JUL 19 2122  7.66 36 49.93 121 25.23  4.70 16   .05  .3  .7 HOL   1.4
97 JUL 19 2156 18.76 38 49.47 122 48.35  3.67  7   .03  .4  .8 GEY   1.3

97 JUL 19 2211  0.50 37 38.84 118 54.68  7.43 12   .04  .4  .9 SMO   1.1
97 JUL 19 2255  3.86 37 39.51 118 55.98  6.23  8   .01  .4  .9 SMO   1.0
97 JUL 19 2333 58.56 37 39.33 118 55.93  6.81 14   .04  .4  .7 SMO   1.1
97 JUL 20   51 46.34 36 57.95 121 35.76  5.89 15   .08  .3  .6 SAR   1.2
97 JUL 20  120 43.76 37 40.85 118 54.14 18.72 12   .27 2.5 7.2 DOM   1.2

--ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH  N N RMS ERH ERZ       DUR
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG

97 JUL 20  129 21.87 36 47.21 121 24.51  9.26 21   .11  .3  .8 HOL   1.6
97 JUL 20  214 28.20 38 48.61 122 47.91  3.99 10   .01  .3  .6 GEY   1.7
97 JUL 20  314 46.35 37 32.03 118 50.73  7.62  8   .03  .6 1.4 MOR   1.1
97 JUL 20  429 19.31 37 38.85 118 54.59  7.79 14   .04  .4  .7 SMO   1.4
97 JUL 20  643  3.77 36 39.16 121 14.32  6.47 27   .05  .2  .5 STN   1.8

97 JUL 20  921 49.74 37 34.85 118 51.15  7.84 10   .06  .5 1.2 MOR   1.0
97 JUL 20  944 53.32 37 38.43 118 54.01  6.12  9   .10  .6 1.1 SMO   1.3
97 JUL 20 1121 58.19 40 24.19 122  6.74  2.63 15   .49 1.323.5 SHA # 2.1

97 JUL 20 1149  1.32 36 48.52 121 30.76  3.26 12   .11  .4  .7 SJB   1.4
97 JUL 20 1350 55.70 40 22.15 122  4.61 10.84 10   .07  .5 2.3 SHA   2.0
97 JUL 20 1418 47.20 38 46.54 122 45.14  0.04  7   .07  .3 1.8 GEY # 1.4
97 JUL 20 1438 48.30 37 31.87 118 51.26  9.41 30   .05  .3  .6 MOR   2.3
97 JUL 20 1442 21.54 40 18.92 124 24.90  8.82  7   .05 1.4  .6 MEN   2.6

97 JUL 20 1701 39.88 38 52.32 123 38.87  7.27 31   .11  .9  .7 PAR   2.8
97 JUL 20 2105  8.34 35 55.73 118 44.07  0.18 10   .15  .5 9.0 BAK # 2.2
97 JUL 20 2325 33.91 40 28.27 121 32.71  4.79 11   .03  .3  .6 LAS   2.1
97 JUL 21  230 45.77 37 24.63 121 48.83  1.07 11   .03  .3 1.3 ALU   1.6

97 JUL 21  335 57.70 37 35.71 118 54.26  6.34 18   .05  .4  .6 SIL   1.4
97 JUL 21  525 46.74 36 34.49 121  7.70 11.04 17   .04  .3  .8 BVL   1.4
97 JUL 21  642  6.11 40 34.47 122 14.57 16.70 12   .19  .6 2.0 SHA   2.3
97 JUL 21 1224 20.75 37 38.74 118 52.44  5.65 15   .06  .4  .5 SMO   1.4
97 JUL 21 1452  4.93 37 38.24 118 51.04  5.14 10   .07  .4  .9 SMO   1.0

97 JUL 21 1453 46.88 37 38.14 118 51.36  5.42 18   .07  .3  .5 SMO   1.4
97 JUL 21 1646 57.69 37 20.54 121 43.05  0.38 19   .05  .2 1.5 ALU   1.7
97 JUL 21 1758  0.12 38 47.98 122 47.59  0.46  9   .07  .3  .5 GEY   1.8
97 JUL 21 1815 30.79 38  0.46 122  3.38 12.87 17   .17  .6  .8 CON   1.8
97 JUL 21 1838 56.25 35 52.63 120 25.53  9.77  9   .02  .5  .7 GOL   1.5

97 JUL 21 2005 28.70 37 38.19 118 51.44  5.33 11   .05  .4  .6 SMO   1.3
97 JUL 21 2224 28.99 40 40.72 124 22.92 21.07 27   .08  .6  .5 EUR   3.5
97 JUL 22   14  0.12 40 18.19 124 20.23  6.81  7   .05 1.2 1.2 MEN   2.1
97 JUL 22  127 21.36 37 38.11 118 51.28  5.11 13   .07  .4  .6 SMO   1.1
97 JUL 22  300 58.84 38 47.62 122 48.57  4.21  9   .02  .4  .7 GEY   1.4

97 JUL 22 1806 34.04 37 33.72 118 49.94  3.93  8   .02  .4 1.6 MOR   1.0
97 JUL 22 1814 42.65 37 38.80 118 57.72  7.41 14   .05  .4  .7 SMO   1.0
97 JUL 22 2012 25.01 36 44.53 121  6.16  3.65 12   .47 4.217.5 PAN # 1.3
97 JUL 22 2349 47.84 40 33.94 122 14.63 19.66  9   .10  .5 1.5 SHA   2.3
97 JUL 23   54 41.36 38 47.76 122 44.59  1.75  8   .03  .3  .8 GEY   1.5

97 JUL 23  318  3.82 40 54.17 123 22.30 25.17 44   .19  .4 3.6 KLA   3.9
97 JUL 23  458 35.59 38 49.07 122 47.77  3.63 12   .04  .3  .7 GEY   1.6
97 JUL 23  845 39.31 38 48.09 122 47.35  0.32  9   .02  .2 1.5 GEY   1.7
97 JUL 23  930  7.13 37 37.38 118 41.42  0.94  7   .14 2.611.6 CAS - 1.1
97 JUL 23  930 54.79 37 33.54 118 46.15 16.67  7   .10 2.8 8.4 WCN - 1.0

--ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH  N N RMS ERH ERZ       DUR
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG

97 JUL 23 1043  7.98 38 40.46 122 43.43  6.71 14   .07  .4  .8 NAP   1.5
97 JUL 23 1348  4.65 37 32.54 118 51.12 12.09  7   .05 1.3 3.1 MOR   1.1
97 JUL 23 1422 44.70 37 39.91 118 49.95  3.06 22   .07  .3  .6 HCF   1.9
97 JUL 23 1651 11.99 36 35.26 121 11.17  4.96  8   .04 1.0  .6 PIN   1.0

97 JUL 23 1713  8.80 38 36.89 122 41.43  8.74  8   .05  .4 1.4 NAP   1.3
97 JUL 23 1919 39.99 37 34.32 118 50.34  7.33 14   .03  .3  .7 MOR   1.5
97 JUL 23 2203 56.20 40 18.20 124 33.44 19.42 28   .09 1.1  .4 MEN   3.4
97 JUL 23 2240 11.05 37 39.86 118 49.84  3.55 18   .07  .3  .6 HCF   1.6
97 JUL 23 2240 31.89 37 40.93 118 48.43  4.36  9   .03 3.6 1.3 EMO   1.2

97 JUL 24  102 11.24 37 39.90 118 49.61  3.25 10   .06  .4  .9 HCF   1.1
97 JUL 24  134  4.49 37 38.05 118 56.15  7.95 10   .05  .7 1.1 SMO   1.0
97 JUL 24  159  9.39 38 46.09 122 42.55  0.46  7   .06  .6  .8 GEY   1.2
97 JUL 24  221  2.85 37 30.47 121 40.33  8.46  8   .01  .4 1.8 HAM   1.1
97 JUL 24  307  9.61 37 39.69 118 53.76  5.97  9   .07  .6 1.0 DOM   1.4

97 JUL 24  307 41.76 37 38.43 118 54.47  8.21 14   .05  .4  .9 SMO   2.1
97 JUL 24  307 50.12 37 38.09 118 54.50  8.25  8   .03  .9 1.1 SMO   1.2
97 JUL 24  308 22.41 37 38.74 118 54.70  9.57  8   .04  .7 1.5 SMO   1.0
97 JUL 24  312 16.14 37 38.21 118 54.59  8.05 15   .04  .4  .6 SMO   1.3
97 JUL 24  327 43.43 37 38.14 118 54.89  6.73 15   .13  .5  .6 SMO   1.0

97 JUL 24  509 17.76 36 28.07 121  2.60  5.60 21   .05  .3  .6 BIT   1.8
97 JUL 24  641 17.18 38 49.03 122 50.08  1.09 12   .04  .2  .6 GEY   1.6

 
   
TABLE 2.
Data from National Earthquake Information Center (NEIC)

UTC TIME    LAT     LONG    DEP GS MAGS  SD STA  REGION AND COMMENTS
HRMNSEC                         MB  Msz     USED
-------------------------------------------------------------------------------
JUL 15
035358.4* 23.156S  63.423W  33N 4.7     1.1  39 SALTA PROVINCE, ARGENTINA
043925.2  36.882N  95.296E  33N 4.7 4.0 0.6  43 QINGHAI, CHINA
143409.1  34.037N 117.236W   5G         1.1  27 SOUTHERN CALIFORNIA. ML 2.9
203540.6% 43.237N   0.365W   5G         0.9  18 PYRENEES. ML 3.3 (LDG).
210041.2  38.287N  26.771W  10G 4.5 4.0 0.9  49 AZORES ISLANDS

JUL 16
020959.8* 21.754S 177.190W 183D 4.5     0.7  25 FIJI ISLANDS REGION
071531.4  59.968N 151.508W  33N         1.1  97 KENAI PENINSULA, ALASKA. ML 3.9
073224.3   8.150S  74.362W 159D 4.6     0.9  75 PERU-BRAZIL BORDER REGION
100607.2  39.104N  25.190E  10G 4.8 3.9 1.2  63 AEGEAN SEA. Felt at Burhaniye,
                                                Turkey.
104327.2* 28.489N  43.664W  10G 4.6 4.3 0.9  24 NORTHERN MID-ATLANTIC RIDGE
104608.2? 28.64 N  42.63 W  10G 4.2     0.8   7 NORTHERN MID-ATLANTIC RIDGE
104727.6  28.637N  43.779W  10G 4.7 4.7 1.2  42 NORTHERN MID-ATLANTIC RIDGE
105308.8* 28.514N  43.445W  10G 5.0 5.1 0.9  34 NORTHERN MID-ATLANTIC RIDGE
163146.5* 22.999S  68.213W 100G 4.3     1.4  28 NORTHERN CHILE
213844.6& 45.018N 121.881W   4               10 WASHINGTON-OREGON BORDER. MD 2.6

JUL 17
062953.6  62.675N 152.340W  33N         1.2  21 CENTRAL ALASKA. ML 3.7
070133.1? 22.94 S 175.64 W  33N 4.9 4.7 0.9  28 TONGA ISLANDS REGION
070309.6? 23.20 S 175.13 W  33N 4.8     1.5  17 TONGA ISLANDS REGION
071742.1  63.306N 151.183W  33N         1.1  25 CENTRAL ALASKA. ML 4.0
084508.9*  7.761S 108.027E  33N 4.7     1.2  30 JAWA, INDONESIA
085445.7% 34.046S  71.016W  33N         0.6  10 NEAR COAST-CENTRAL CHILE. MD 3.0
124535.0   3.663N  74.119W  33N 4.9 4.0 0.9  75 COLOMBIA. Felt at Bogota and
        Villavicencio. Also felt in Caqueta Department.
141948.3  51.960N 178.947E 100G 4.3     1.1  33 RAT ISLANDS, ALEUTIAN ISLANDS.
                                                ML 4.2 (PMR).
154208.4  18.190N 145.515E 221D 4.7     1.1  72 MARIANA ISLANDS
194637.0& 36.960N 121.600W   7               23 CENTRAL CALIFORNIA. Mw 3.9, ML
4.1
                Felt at San Francisco, San Jose, and Santa Cruz.

JUL 18
005129.2  37.671N 118.846W   5G         0.8  12 CALIFORNIA-NEVADA BORDER. ML 3.4
144551.4* 60.477S  25.006W  33N 4.7     1.0  13 SOUTH SANDWICH ISLANDS REGION
185941.9? 29.64 N  68.46 E  33N 5.1     0.9   7 PAKISTAN
193921.9? 26.73 N  91.72 E  33N 4.9     0.5  16 NORTHEASTERN INDIA
235042.4* 45.864N 149.934E  33N 5.1     0.6  55 KURIL ISLANDS

JUL 19
073437.9* 17.651N 100.149W  33N 4.7 3.8 1.0  43 GUERRERO, MEXICO. Felt.
122257.8  29.043S  71.397W  26D 5.8 5.4 0.7  97 NEAR COAST-CENTRAL CHILE. 
               Felt (V) at Vallenar; (IV) at Caldera, Chanaral, Copiapo,
               El Salvador and Ovalle; (III) at Coquimbo and La Serena. 
142204.8  15.843N  98.193W  33N 5.7 6.2 1.0  96 OFF COAST OF GUERRERO, MEXICO.
        Mw 6.8.  Felt in Guerrero and Oaxaca. Also felt at Mexico City.
145452.6? 16.33 N  98.06 W  33N 4.1     1.0  10 NEAR COAST OF GUERRERO, MEXICO
150440.9? 16.50 N  98.24 W  33N 3.5     1.2   9 NEAR COAST OF GUERRERO, MEXICO
161015.5* 22.797S 169.318E  33N 5.8 5.4 0.7  55 LOYALTY ISLANDS REGION
170124.9? 33.88 N 141.66 E  33N 4.6     0.6  24 OFF EAST COAST OF HONSHU, JAPAN
170636.4  35.015N  84.615W  10G         0.6  10 TENNESSEE. mbLg 3.5 (GS).
174057.7* 16.513N  98.067W  33N 4.6 4.1 1.1  40 NEAR COAST OF GUERRERO, MEXICO
182728.9? 16.53 N  98.13 W  33N 3.9     0.8   9 NEAR COAST OF GUERRERO, MEXICO
192932.6? 16.46 N  98.10 W  33N 4.1     0.7  11 NEAR COAST OF GUERRERO, MEXICO
224000.2? 16.79 N  98.23 W  33N 4.1     1.4  10 NEAR COAST OF GUERRERO, MEXICO

JUL 20
003020.7  52.677N 167.536W  15D 5.6 5.9 1.1 123 FOX ISLANDS, ALEUTIAN ISLANDS.
                                                Mw 6.2 (GS).
003839.5* 52.661N 167.492W  33N 4.4     1.0   9 FOX ISLANDS, ALEUTIAN ISLANDS
005529.2  52.639N 167.399W  33N 4.8     0.9  35 FOX ISLANDS, ALEUTIAN ISLANDS
033908.6* 41.262N  20.013E  10G 4.6     1.0  10 ALBANIA
034030.5? 16.83 N  98.22 W  33N 4.2     0.8  18 NEAR COAST OF GUERRERO, MEXICO
063509.8? 16.64 N  98.10 W  33N 4.2     0.8  20 NEAR COAST OF GUERRERO, MEXICO
092430.0* 41.246N  19.967E  10G 3.8     1.1  16 ALBANIA
101423.5  22.667S  66.024W 257D 6.0     0.7 110 JUJUY PROVINCE, ARGENTINA. Mw
6.1
              Felt (IV) at Calama and Mejillones; (III) at Antofagasta,
              San Pedro de Atacama and Tocopilla, Chile.
104944.0*  6.071S 145.516E 121D 5.1     0.9  15 NEW GUINEA, PAPUA NEW GUINEA
114943.1*  3.304N 128.378E  33N 4.9     1.1  11 NORTH OF HALMAHERA, INDONESIA
115230.0? 16.27 N  98.11 W  33N 4.2     1.1  26 NEAR COAST OF GUERRERO, MEXICO
174348.8  18.972N  46.103W  10G 4.8 4.5 0.7  34 NORTHERN MID-ATLANTIC RIDGE
193310.7* 16.784S 179.204W 490D 4.5     0.6  41 FIJI ISLANDS REGION

JUL 21
074640.2*  8.819S 108.105W  10G 5.0 4.7 0.8  47 CENTRAL EAST PACIFIC RISE
083256.6*  8.748S 108.083W  10G 4.8 4.3 0.8  52 CENTRAL EAST PACIFIC RISE
145621.9*  8.785S 108.091W  10G 4.8 4.2 0.7  36 CENTRAL EAST PACIFIC RISE
175416.4  30.101S  71.715W  33N 4.8 4.8 0.8  35 NEAR COAST-CENTRAL CHILE.
        Felt (II) at Coquimbo and La Serena.
231940.2* 30.078S  71.738W  33N 5.2 5.5 1.0  59 NEAR COAST-CENTRAL CHILE. Mw 6.1
                                                Felt (III) at La Serena. 

JUL 22
000956.7  47.774N 122.364W  15G         0.6   6 WASHINGTON. ML 2.8 (GS).
020934.8* 29.687S  71.618W  33N 4.9 4.7 0.9  50 NEAR COAST-CENTRAL CHILE.
        Felt (III) at Coquimbo, La Serena, Ovalle and Santiago.
083320.4* 20.388S 178.700W 529D 4.9     0.5  77 FIJI ISLANDS REGION
101655.0   6.191S 154.734E  51D 5.6     0.6  73 SOLOMON ISLANDS. Mw 5.6
112140.5  36.318N 120.450W   5G         0.8  11 CENTRAL CALIFORNIA. ML 2.8 (GS).
134456.2* 31.915S  71.409W  33N 4.7 4.1 0.8  19 NEAR COAST-CENTRAL CHILE.
        /Felt (IV) at Catemu, Illapel, Llaillay, Los Vilos, Panquehue and
        Salamanca; (III) at La Ligua, Papudo, Quillota, San Felipe, Santa Maria,
        and Santiago; and (II) at Coquimbo, La Serena and Ovalle.
142815.4? 22.89 S 175.08 W  33N 4.8 4.9 0.6  24 TONGA ISLANDS REGION
162140.3* 66.169N  18.174W  10G 4.8 4.6 1.0  32 ICELAND REGION
174342.3* 16.193N  98.202W  33N 4.8 4.1 1.1  44 NEAR COAST OF GUERRERO, MEXICO
180124.0? 16.62 N  98.04 W  33N 4.3     1.0  20 NEAR COAST OF GUERRERO, MEXICO
191034.6   4.566N  32.619W  10G 5.5 5.1 0.9  72 CENTRAL MID-ATLANTIC RIDGE. 

Notes for Table 1:
       Origin time in the list is in GMT, in the text and on maps
       it is in local time.
       N RD: is the number of readings used to locate the event.
       N S: is the number of S waves in N RD.
       RMS SEC: is the root mean squared residual misfit for the
                location is seconds, the lower the better, over 0.3
                to 0.5 seconds is getting bad, but this is machine,
                not hand timed, data.
       ERH: is the estimated horizontal error in kilometers.
       ERZ: is the estimated vertical error in kilometers.
       N FM: is the number of readings used to compute the magnitude.
       REMKS: obtuse region codes that denote the velocity model
              used to locate the event.
       DUR MAG: is the magnitude as determined from the duration of
                the seismograms, not the amplitude.  Sort of like
                going to echo canyon and measuring how loud your
                yell is by counting echos.
       FIG: denotes the figure/event number in the maps posted separately.