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 August 1 - 7, 1996 Stephen R. Walter U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 San Francisco Bay Area Activity remained light throughout the Bay Area. During the seven-day period ending at midnight on August 7, 1996 the U.S. Geological Survey office in Menlo Park recorded 15 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Four were as large as M2. This total compares to 18 earthquakes during the previous eight-day period (July 24 - 31), five of which were as large as M2. The San Andreas fault was the source of three of the four M2 events. The first of these occurred early last Thursday morning just north of Loma Prieta Mountain in the Santa Cruz Mountains (#1/1). It was followed early Friday morning by a M2.1 along the creeping segment of the San Andreas, about 13 miles southeast of Hollister (#2/1), and by another M2.1 just after noon on Saturday that was located just southeast of San Juan Bautista (#3/1). The week's largest earthquake was a M2.8 events that occurred Wednesday afternoon on the central Calaveras fault in eastern San Jose (#4/1). Northern & Central California The week was relatively quiet throughout the region with only one earthquake as large as M3, a M3.5 that occurred along the Mendocino fracture zone about 18 miles west of Petrolia, an area that had seen two M2 events earlier in the week (#1/2). To the north a M2.2 event occurred along the coast just three miles southwest of Eureka (#10/2). The Coast Ranges were quiet at the M2 level except at the Geysers geothermal area where five M2 events occurred over the course of the week. Two M2 earthquakes were also recorded in the northern Sacramento Valley, a M2.1 about 12 miles northeast of Willows (#2/2) and a M2.1 beneath the Lake Shasta area northeast of Redding (#9/2). Activity in the Sierra Nevada range included a pair of small M2's beneath Lake Almanor about five miles southeast of Chester (#4/2), a pair of M2's east of Markleeville (#6/2), and M2.1's west of Carson City Nevada and southwest of South Lake Tahoe (#3/2). Central California experienced three small M2's along the central creeping segment of the San Andreas. The central Valley saw a M2.6 northwest of Coalinga (#7/2) and a M2.2 about 12 miles east of Avenal. Finally, a M2.3 occurred along the Big Sur coast about 13 miles northwest of San Simeon (#8/2). Long Valley Caldera Activity in the caldera continued along the southwest side of the resurgent dome, just east of the town of Mammoth Lakes (#2/3). Of the four M2 quakes that occurred during the week, the two largest were only M2.2 and none were reported to have been felt locally. Activity south of the caldera saw a pair of M2 events near Mt. Baldwin (#1,#4/3), a M2.1 beneath Mt. Morrison (#3/3), and a M2.0 beneath the north slope of Laurel Mountain (#5/3). USA Seismicity (July 29 - August 7) The largest earthquake in the lower 48 states was a M4.3 in east- central Idaho that was felt in the towns of Challis and Salmon (#4/4). Also felt were a pair of M3 earthquakes that occurred just east of the southern Colorado town of Trinidad (#2/4) and a M3.3 earthquake in the northern Willamette Valley that was felt at Estacada, Lebanon, Sandy, and Silverton, Oregon (#3/4). Probably felt, though we've received no felt reports, was a M3.5 in western Nevada north of the town of Fallon (#6/4). Other domestic quakes of note include a pair of felt events north of the San Fernando Valley (#5/4) and a M3.2 Gorda Plate earthquake off the coast of northern California/southern Oregon (#1/4). The Planet Earth (July 29 - August 7) The southwestern Pacific was far and away the most active area on the planet with a major earthquake (M7.1) in the Solomon Islands region that was felt at Gorontalo and Tolitoli (#2/5) and a trio of moderate to large earthquakes along the Tonga trench. Of the latter events, the largest were a Ms6.7 in the Tonga Islands (#4/5) and a Mb6.5 just southeast of the Fiji Islands at a depth of over 500 km (#6/5). A Ms5.9 near the coast of Ecuador was felt in Guayas and Manabi Provinces (#5/5). 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 96 AUG 1 752 6.55 38 49.24 122 47.86 3.66 9 .03 .3 .8 GEY 1.4 96 AUG 1 818 46.85 38 48.49 122 48.78 3.83 8 .02 .3 .7 GEY 1.2 96 AUG 1 1009 51.01 40 18.06 124 30.70 22.00 21 1 .07 1.0 .4 MEN 2.6 96 AUG 1 1044 58.21 37 9.31 121 56.65 7.68 76 1 .12 .1 .3 LOM 2.3 96 AUG 1 1239 9.49 38 47.85 122 48.33 3.81 8 .03 .3 .6 GEY 1.2 96 AUG 1 1313 24.93 36 23.37 120 57.31 1.46 10 .10 .6 1.4 BIT 1.8 96 AUG 1 1745 12.88 39 42.08 122 6.52 18.42 25 .20 .6 1.1 SAC# 2.1 96 AUG 1 2103 37.92 36 54.54 121 38.34 5.82 40 .13 .2 .5 SJB 1.7 96 AUG 1 2115 56.77 38 47.86 122 45.70 1.21 18 .07 .2 .5 GEY 1.7 96 AUG 1 2227 11.42 38 48.95 122 48.64 3.34 7 .03 .6 .4 GEY 1.3 96 AUG 2 7 26.91 37 38.91 118 54.79 5.96 22 .11 .4 .5 SMO 1.5 96 AUG 2 222 48.38 37 38.50 118 57.17 7.42 8 .06 .9 1.6 SMO 1.3 96 AUG 2 337 3.15 37 30.05 118 52.51 7.32 22 .08 .4 .6 MOR 1.3 96 AUG 2 338 13.88 38 49.59 122 47.60 4.84 18 .07 .3 .6 GEY 1.5 96 AUG 2 523 23.34 37 33.75 118 49.46 9.22 22 .07 .3 .6 MOR 1.4 96 AUG 2 634 6.08 37 29.65 118 50.81 9.56 9 .08 .9 1.2 MOR 1.0 96 AUG 2 728 47.95 39 48.01 122 28.83 2.51 16 .46 1.037.3 SAC - 1.6 96 AUG 2 817 46.57 36 1.96 120 36.16 9.30 9 .11 .6 .9 SLA 1.2 96 AUG 2 841 30.25 37 14.95 122 1.86 9.11 8 .07 1.1 1.3 BLM 1.1 96 AUG 2 853 16.02 39 8.56 119 55.60 8.22 14 .08 1.0 3.5 WAK 2.2 96 AUG 2 939 8.37 37 39.39 118 54.63 4.16 13 .06 .4 .7 DOM 1.5 96 AUG 2 946 30.32 36 41.02 121 18.41 4.23 29 .07 .2 .5 STN 1.6 96 AUG 2 953 48.12 36 41.05 121 18.38 4.27 52 .09 .2 .4 STN 2.2 96 AUG 2 1037 22.22 38 50.47 122 49.37 2.59 12 .03 .2 .7 GEY 1.4 96 AUG 2 1050 19.19 38 47.24 122 44.93 0.05 9 .05 .3 1.0 GEY # 1.4 96 AUG 2 1338 24.06 38 51.20 122 47.67 0.76 8 .05 .3 1.2 GEY 1.4 96 AUG 2 1847 29.50 40 20.13 124 45.08 19.02 24 1 .15 1.7 .7 MEN 2.2 96 AUG 2 1926 57.97 36 57.60 121 35.51 4.93 19 .14 .3 .6 SAR # 1.4 96 AUG 2 2000 5.50 37 34.60 118 49.70 3.17 27 2 .06 .2 .4 MOR 1.8 96 AUG 2 2031 1.97 37 35.65 118 47.31 1.37 7 .18 2.0 2.2 MOR 1.1 96 AUG 2 2046 7.92 37 31.81 118 52.80 4.90 24 .07 .3 .8 MOR 2.3 96 AUG 3 354 1.05 37 37.41 118 56.13 6.23 8 .05 .6 1.2 SMO 1.1 96 AUG 3 409 40.72 37 37.56 118 56.16 5.40 9 .04 .5 .8 SMO 1.4 96 AUG 3 641 15.04 37 38.70 118 55.21 8.07 16 .10 .5 .7 SMO 1.8 96 AUG 3 647 27.71 37 39.01 118 54.90 7.21 7 .05 1.1 1.4 DOM 1.1 96 AUG 3 649 50.06 36 28.95 121 3.56 6.97 11 .05 .4 .8 BIT 1.3 96 AUG 3 806 44.77 37 39.09 118 55.05 6.67 14 .08 .4 .8 DOM 1.4 96 AUG 3 1112 9.53 38 49.41 122 47.98 3.76 13 .04 .3 .7 GEY 1.8 96 AUG 3 1405 56.09 40 15.13 121 9.98 5.91 18 2 .14 .5 3.1 ALM 2.1 96 AUG 3 1406 40.08 40 15.19 121 11.27 8.91 18 1 .14 .6 3.0 ALM# 2.1 96 AUG 3 1424 20.24 36 36.03 121 12.48 6.45 9 .05 .4 .9 PIN 1.0 96 AUG 3 1845 38.49 37 33.65 118 50.92 6.64 10 .04 .5 .7 MOR 1.4 96 AUG 3 1955 20.79 36 48.27 121 31.64 6.04 46 .18 .3 .6 SJB 2.1 96 AUG 3 2032 42.58 37 38.95 118 56.18 6.53 16 .08 .4 .6 SMO 2.0 96 AUG 3 2059 27.47 37 38.93 118 56.11 6.29 14 .09 .5 .7 SMO 1.7 --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 96 AUG 3 2133 29.33 37 30.04 118 47.73 10.20 20 .08 .4 .7 MOR 1.7 96 AUG 3 2201 41.47 37 39.66 118 54.86 0.04 10 .31 .7 1.0 DOM # 1.4 96 AUG 4 202 36.40 37 37.39 118 53.62 5.31 15 .07 .4 .6 SMO 1.6 96 AUG 4 219 49.14 36 19.92 120 53.52 6.71 12 .04 .3 .7 BIT 1.2 96 AUG 4 302 54.71 38 48.10 122 46.64 0.74 9 .04 .3 .6 GEY 2.3 96 AUG 4 307 53.64 38 48.07 122 46.67 1.01 8 .04 .3 .6 GEY 1.2 96 AUG 4 359 38.04 37 39.30 118 51.58 4.96 14 .13 .4 .8 DOM 1.5 96 AUG 4 458 16.65 36 19.85 120 53.73 7.62 24 .10 .3 .7 BIT 2.1 96 AUG 4 545 44.34 37 33.47 118 51.02 7.41 20 .06 .3 .6 MOR 2.1 96 AUG 4 546 56.36 38 48.18 122 45.05 0.04 10 .26 .7 2.0 GEY # 2.3 96 AUG 4 723 33.94 38 50.46 122 49.61 2.50 7 .01 .4 .8 GEY 1.3 96 AUG 4 824 1.51 38 50.31 122 49.74 2.78 8 .06 .4 .9 GEY 1.1 96 AUG 4 1136 56.68 38 49.25 122 47.91 3.94 8 .02 .3 .9 GEY 1.0 96 AUG 4 1429 40.92 36 57.27 120 15.84 6.90 35 .23 .5 1.2 JQN 2.4 96 AUG 4 1845 31.79 38 46.06 119 38.89 7.83 11 .07 1.2 1.9 WAK 2.4 96 AUG 4 1901 26.73 38 51.26 122 51.44 1.58 8 .04 .6 .5 GEY 1.3 96 AUG 4 2005 37.22 38 49.48 122 47.64 3.68 15 .06 .3 .6 GEY 1.7 96 AUG 4 2017 54.44 38 35.55 122 15.04 4.95 9 .06 .4 .7 GVL 1.3 96 AUG 4 2045 56.65 38 49.47 122 48.00 3.79 9 .06 .3 .9 GEY 1.4 96 AUG 4 2046 31.98 38 50.07 122 52.58 2.88 16 .07 .2 .9 GEY 1.8 96 AUG 4 2121 10.94 37 31.79 118 52.69 6.52 19 .08 .3 .7 MOR 1.0 96 AUG 4 2238 15.14 38 48.76 122 48.50 3.55 8 .01 .3 .7 GEY 1.2 96 AUG 4 2308 3.44 38 47.57 122 48.38 4.08 7 .01 .4 .8 GEY 1.0 96 AUG 4 2330 4.02 39 26.34 123 18.08 11.85 10 .17 .7 3.1 MAA 1.8 96 AUG 4 2346 43.54 38 49.28 122 48.54 3.94 7 .01 .4 .8 GEY 1.0 96 AUG 4 2352 19.48 36 16.78 120 27.43 9.61 36 .16 .2 .5 COA 2.7 96 AUG 5 130 29.65 38 47.62 122 44.50 1.59 11 .06 .3 .7 GEY 1.6 96 AUG 5 131 49.40 36 16.91 120 27.25 10.02 11 .07 .4 .7 COA 1.8 96 AUG 5 230 55.66 37 34.51 118 49.76 3.50 29 .09 .3 .6 MOR 2.2 96 AUG 5 308 43.10 38 48.66 122 47.16 0.87 8 .07 .3 .6 GEY 1.2 96 AUG 5 435 27.04 37 36.47 118 54.62 7.58 22 .08 .3 .5 SHE 1.6 96 AUG 5 438 36.81 38 53.29 120 11.32 6.82 11 .07 .8 6.2 WAK 2.0 96 AUG 5 521 34.55 38 48.81 122 48.59 3.68 7 .04 .4 .7 GEY 1.0 96 AUG 5 559 17.52 39 37.79 123 22.80 8.10 9 .04 .4 .7 MAA 1.3 96 AUG 5 838 37.68 38 48.65 122 48.78 4.33 8 .02 .3 .8 GEY 1.2 96 AUG 5 907 9.68 38 53.87 120 10.56 11.39 11 .05 1.8 3.6 WAK 2.3 96 AUG 5 907 11.13 37 36.30 118 55.68 4.30 23 .11 .3 .5 SHE 1.8 96 AUG 5 910 16.60 37 36.42 118 55.50 4.74 22 .09 .3 .4 SHE 1.5 96 AUG 5 933 30.28 38 47.75 122 44.96 1.80 37 .08 .2 .5 GEY 2.6 96 AUG 5 934 30.79 38 48.28 122 45.27 0.91 9 .04 .3 .8 GEY 1.1 96 AUG 5 934 45.75 38 47.87 122 45.00 2.05 8 .05 .3 .8 GEY 1.1 96 AUG 5 943 52.52 38 47.73 122 44.88 1.29 8 .06 .3 .9 GEY 1.4 96 AUG 5 948 55.12 38 47.74 122 44.81 0.31 9 .06 .3 1.0 GEY 1.5 96 AUG 5 1038 24.72 37 38.46 118 56.64 5.81 12 .08 .5 .7 SMO 1.1 96 AUG 5 1134 1.98 37 14.51 121 37.54 6.59 49 1 .06 .1 .4 SFL 1.5 --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 96 AUG 5 1227 13.13 36 59.95 121 28.10 4.80 15 .06 .3 .6 CYS .9 96 AUG 5 1303 9.23 38 49.53 122 48.15 4.05 7 .03 .5 .9 GEY 1.2 96 AUG 5 1320 59.92 37 38.47 118 55.06 8.28 13 .11 .6 .9 SMO 1.2 96 AUG 5 1324 30.39 37 26.11 118 35.41 13.76 8 .07 1.0 2.1 RVL 1.0 96 AUG 5 1412 27.62 40 30.66 124 14.66 17.77 9 .03 .5 .5 EUR 1.8 96 AUG 5 1459 31.26 39 25.23 123 17.19 5.71 9 .05 .3 3.3 MAA 1.5 96 AUG 5 1734 10.03 38 50.70 122 48.17 1.11 7 .07 .4 1.0 GEY 1.0 96 AUG 5 1801 41.11 35 49.17 121 17.30 0.62 36 .40 1.1 9.8 SSM 2.3 96 AUG 5 1806 14.18 38 1.03 118 25.45 1.42 21 .07 .4 6.9 MOL 1.9 96 AUG 5 1833 48.38 37 34.80 118 51.47 2.62 8 .07 .5 .9 MOR 1.3 96 AUG 5 1929 13.23 38 46.58 122 42.82 2.54 8 .04 .5 .6 GEY 1.7 96 AUG 5 2011 15.71 37 56.41 118 9.11 1.62 19 .10 1.0 9.3 NEV - 2.8 96 AUG 5 2110 25.16 38 50.65 122 47.78 1.13 11 .04 .3 .8 GEY 1.7 96 AUG 6 54 58.87 36 1.11 119 54.82 23.82 34 1 .26 .7 .9 COA 2.3 96 AUG 6 154 56.97 36 51.33 121 18.94 3.48 34 1 .07 .2 .4 QUI 1.4 96 AUG 6 332 23.70 38 49.50 122 48.09 3.65 7 .04 .4 .8 GEY 1.1 96 AUG 6 344 29.74 40 46.59 122 15.62 11.44 23 1 .24 .5 1.8 SHA 2.2 96 AUG 6 725 50.36 36 28.49 121 1.43 5.42 14 .06 .5 .9 BIT 1.5 96 AUG 6 1150 26.23 36 46.85 121 29.21 11.84 11 .09 .6 1.1 SJB 1.0 96 AUG 6 1246 28.93 37 36.81 118 47.51 6.33 11 .10 .4 .9 HCF 1.3 96 AUG 6 1428 4.23 38 40.89 119 37.44 41.30 18 .34 1.9 4.3 WAK 2.6 96 AUG 6 1620 58.12 38 48.17 122 46.12 1.38 11 .05 .3 .6 GEY 2.0 96 AUG 6 1621 51.81 38 48.12 122 46.28 1.76 7 .03 .3 .7 GEY 1.2 96 AUG 6 1626 25.68 37 24.43 121 49.01 0.02 7 .04 .7 2.2 ALU # 1.6 96 AUG 6 1651 42.01 37 35.75 118 29.11 9.57 23 .08 .3 .8 CHV 1.8 96 AUG 6 1714 9.54 37 53.56 118 11.84 0.03 18 2 .08 2.5 1.7 NEV # 2.0 96 AUG 6 2015 20.97 37 37.86 118 56.74 8.39 20 .13 .4 .7 SMO 2.2 96 AUG 6 2050 33.52 38 50.32 122 48.03 1.68 19 .09 .3 .7 GEY 1.9 96 AUG 6 2109 45.98 38 49.19 122 48.54 3.89 8 .02 .3 .8 GEY 1.4 96 AUG 6 2216 55.29 40 26.99 122 40.76 19.84 12 .07 .5 .5 KLA 1.9 96 AUG 6 2329 9.37 36 32.95 121 5.93 7.36 14 .07 .3 .8 BVL 1.6 96 AUG 7 48 19.72 36 22.43 121 1.42 0.17 8 .04 .4 .6 BIT 2.4 96 AUG 7 603 26.69 38 48.73 122 48.68 3.93 8 .01 .3 .7 GEY 1.3 96 AUG 7 626 36.70 37 32.10 118 50.15 8.08 24 .07 .3 .8 MOR 2.0 96 AUG 7 811 26.74 38 47.20 122 46.43 2.36 14 .04 .2 .6 GEY 2.1 96 AUG 7 1009 57.46 38 49.31 122 48.24 3.43 11 .03 .3 .7 GEY 1.6 96 AUG 7 1016 33.17 37 36.42 118 55.51 3.81 10 .08 .5 .9 SHE 1.4 96 AUG 7 1032 23.88 37 36.16 118 55.45 3.77 11 .09 .5 1.1 SHE 1.2 96 AUG 7 1118 24.73 38 47.29 122 46.25 2.95 8 .04 .3 .8 GEY 1.2 96 AUG 7 1149 6.93 38 48.29 122 47.02 0.63 9 .06 .3 .7 GEY 1.2 96 AUG 7 1151 47.30 38 48.79 122 48.00 3.80 13 .02 .2 .5 GEY 1.9 96 AUG 7 1153 0.67 36 32.52 121 7.37 2.95 29 .07 .2 .5 PIN 2.2 96 AUG 7 1412 23.26 37 38.50 118 54.48 6.16 7 .14 .8 1.0 SMO 1.0 96 AUG 7 1434 26.16 40 44.94 124 11.71 8.66 14 1 .04 .3 .5 EUR 2.1 96 AUG 7 1434 46.58 36 48.76 121 32.04 8.32 46 1 .14 .3 .5 SJB 1.7 --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 96 AUG 7 1439 6.20 36 48.86 121 31.87 7.83 24 .12 .3 .7 SJB 1.3 96 AUG 7 1717 51.96 37 38.18 118 51.34 5.23 28 .09 .3 .5 SMO 2.2 96 AUG 7 1840 59.86 37 35.30 118 53.22 4.18 22 .09 .3 .6 MOR 2.0 96 AUG 7 2254 13.95 37 20.76 121 42.72 7.69 63 .07 .1 .4 ALU 2.8 96 AUG 7 2335 40.12 37 38.77 118 55.39 7.74 8 .07 .6 .9 SMO 1.1 96 AUG 7 2339 1.74 37 38.54 118 56.37 6.47 23 .13 .4 .6 SMO 2.2 96 AUG 7 2345 2.69 37 38.29 118 55.71 7.52 10 .14 .7 1.2 SMO 1.6 96 AUG 7 2356 38.84 37 38.69 118 55.42 8.07 11 .08 .5 .9 SMO 1.7 96 AUG 8 10 55.74 37 38.77 118 55.79 5.61 7 .03 .4 .9 SMO 1.0 96 AUG 8 16 10.27 37 38.81 118 55.89 1.80 7 .02 .3 .5 SMO 1.1 96 AUG 8 25 31.60 37 39.13 118 56.98 3.28 10 .38 1.1 2.5 SMO 1.5 96 AUG 8 31 7.04 37 38.76 118 55.83 6.21 11 .06 .4 .8 SMO 1.4 96 AUG 8 32 28.90 37 39.64 118 56.86 0.02 18 .48 .6 1.0 SMO # 2.0 96 AUG 8 35 59.68 37 38.74 118 56.24 6.10 12 .12 .4 .7 SMO 1.6 96 AUG 8 38 9.62 36 34.08 121 10.16 7.48 9 .05 .4 .9 PIN 1.1 96 AUG 8 40 48.22 37 39.05 118 56.29 0.11 9 .24 .6 1.3 SMO # 1.9 96 AUG 8 58 46.72 37 38.82 118 55.82 5.73 16 .12 .5 .7 SMO 1.8 96 AUG 8 101 40.42 37 38.79 118 55.78 6.70 9 .11 .6 1.2 SMO 1.7 96 AUG 8 107 26.69 37 38.67 118 55.61 7.43 11 .07 .6 .9 SMO 1.3 96 AUG 8 116 59.99 37 38.33 118 55.54 6.60 9 .09 .5 .9 SMO 1.5 96 AUG 8 202 36.25 37 32.73 118 49.61 10.28 17 .06 .4 .9 MOR 1.7 96 AUG 8 308 4.83 37 39.05 118 55.80 5.86 7 .04 .6 1.1 SMO 1.1 96 AUG 8 357 0.00 37 38.21 118 55.61 6.83 12 .06 .4 .8 SMO 1.4 96 AUG 8 622 49.51 40 21.13 124 38.22 22.78 39 .11 .9 1.2 MEN 3.5 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 29 000447.3 33.453S 66.100W 33N 4.9 0.9 58 SAN LUIS PROVINCE, ARGENTINA. Felt throughout San Luis Province. 002813.0? 1.95 N 80.64 W 33N 3.9 1.5 16 OFF COAST OF ECUADOR 004737.5 54.028N 109.227E 33N 4.1 0.7 15 LAKE BAYKAL REGION, RUSSIA 015202.3? 20.96 S 178.57 W 500G 4.1 1.0 12 FIJI ISLANDS REGION 031958.8& 18.900N 155.250W 10G 3.8 10 HAWAII. . 042513.8* 37.181N 72.157E 200G 3.6 0.9 8 TAJIKISTAN 045839.3& 59.770N 153.500W 131 3.8 108 SOUTHERN ALASKA. . 055329.7? 33.99 S 72.15 W 40G 0.3 10 OFF COAST-CENTRAL CHILE. MD 3.6 094722.4* 60.101S 159.567E 10G 4.5 1.1 13 MACQUARIE ISLANDS REGION 113653.9% 32.761S 71.685W 50G 0.4 11 NEAR COAST-CENTRAL CHILE. MD 4.0 132549.6* 18.056N 145.673E 200G 4.1 0.9 18 MARIANA ISLANDS 144450.9* 24.370N 127.423E 33N 4.7 1.0 23 SOUTHEAST OF RYUKYU ISLANDS 151210.7* 31.419S 69.546W 180G 0.4 11 SAN JUAN PROV., ARGENTINA. MD 4.1 172758.4* 7.499N 127.052E 33N 4.5 1.4 31 PHILIPPINE ISLANDS REGION 173349.4 21.923S 178.368W 400G 4.6 1.0 75 FIJI ISLANDS REGION 191722.6? 2.70 N 126.56 E 33N 4.0 0.8 10 NORTHERN MOLUCCA SEA 193638.9 35.212N 136.400E 33N 3.5 1.3 13 WESTERN HONSHU, JAPAN 200005.5* 51.534N 176.457E 33N 4.1 1.1 9 RAT ISLANDS, ALEUTIAN ISLANDS 200337.8 50.863N 175.980E 33N 3.9 0.6 18 RAT ISLANDS, ALEUTIAN ISLANDS JUL 30 001512.8* 1.002N 120.193E 33N 4.4 1.1 10 MINAHASSA PENINSULA, SULAWESI 002251.1 7.114S 127.131E 300G 4.5 1.2 9 BANDA SEA 005505.2* 6.879S 132.593E 33N 4.6 1.3 15 TANIMBAR ISLANDS REG., INDONESIA 011744.8* 13.430S 167.117E 150G 4.7 1.0 12 VANUATU ISLANDS 024352.3* 6.883S 129.726E 100G 4.8 1.3 17 BANDA SEA 030112.1* 41.920N 146.124E 33N 4.2 1.5 13 OFF COAST OF HOKKAIDO, JAPAN 030705.5* 43.726N 85.238E 33N 4.0 1.3 11 NORTHERN XINJIANG, CHINA 042855.6 43.825N 84.610E 33N 4.3 0.9 18 NORTHERN XINJIANG, CHINA 063708.0% 32.464S 71.958W 10G 0.4 12 NEAR COAST-CENTRAL CHILE. MD 4.2 063802.5& 18.470N 155.650W 0G 3.8 9 HAWAII. . 094350.8? 17.72 S 178.72 W 500G 4.1 1.0 12 FIJI ISLANDS REGION 114810.9? 3.98 S 141.66 E 33N 4.4 1.3 7 NEW GUINEA, PAPUA NEW GUINEA 135555.4& 18.900N 155.250W 10G 4.3 24 HAWAII. . 160525.3* 28.477N 113.134W 10G 4.0 1.0 21 BAJA CALIFORNIA, MEXICO 181707.6? 8.87 S 109.29 W 10G 4.8 1.1 29 CENTRAL EAST PACIFIC RISE 214607.6* 38.849N 20.969E 10G 4.0 1.3 27 GREECE. ML 4.2 (ROM). 234150.7* 28.994S 12.963W 10G 4.6 1.2 15 SOUTHERN MID-ATLANTIC RIDGE JUL 31 001501.2 51.562N 16.176E 10G 3.5 0.8 15 POLAND. ML 3.6 (VIE). 003215.5* 37.502N 143.093E 33N 4.1 1.2 19 OFF EAST COAST OF HONSHU, JAPAN 011331.7* 41.958N 125.928W 10G 3.2 1.3 10 OFF COAST OF NORTHERN CALIFORNIA 021916.4* 3.877S 151.264E 33N 4.9 5.2 1.1 26 NEW IRELAND REGION, P.N.G. 022735.1* 3.781S 151.042E 33N 4.4 1.0 18 NEW IRELAND REGION, P.N.G. 040612.7* 3.898S 151.551E 33N 4.9 1.0 16 NEW IRELAND REGION, P.N.G. 043642.8? 10.91 N 84.91 W 100G 3.9 1.2 13 COSTA RICA 053151.3 41.317N 14.392E 10G 3.5 1.4 15 SOUTHERN ITALY. 054823.9* 3.879N 31.512W 10G 4.3 4.2 1.0 26 CENTRAL MID-ATLANTIC RIDGE 061202.9* 30.435N 140.660E 100G 4.1 1.1 11 SOUTH OF HONSHU, JAPAN 063944.5* 4.663S 151.656E 33N 4.6 1.2 16 NEW BRITAIN REGION, P.N.G. 080027.2 30.096N 88.171E 33N 5.0 5.0 1.1 89 XIZANG 080252.6 30.108N 88.140E 33N 5.0 5.0 0.9 77 XIZANG 083703.1? 30.50 N 88.12 E 33N 4.0 1.4 8 XIZANG 092341.0* 36.165N 27.218E 33N 4.4 1.2 20 DODECANESE ISLANDS 101933.0 2.726N 128.609E 250G 4.5 0.7 26 HALMAHERA, INDONESIA 102910.5 12.758S 66.343E 10G 5.0 4.9 0.9 66 MID-INDIAN RIDGE 114328.8* 28.478N 142.697E 33N 4.1 0.9 18 BONIN ISLANDS REGION 123320.8* 53.528N 165.666W 33N 3.8 1.4 16 FOX ISLANDS, ALEUTIAN ISLANDS 123851.8* 53.720N 165.680W 56* 4.1 1.0 22 FOX ISLANDS, ALEUTIAN ISLANDS 140054.9* 46.313N 153.067E 33N 4.5 4.2 1.3 40 KURIL ISLANDS 160655.4 36.551N 71.042E 200G 3.8 0.8 12 AFGHANISTAN-TAJIKISTAN BORD REG. 163434.3? 32.09 S 71.49 W 10G 0.4 10 NEAR COAST-CENTRAL CHILE. MD 3.8 174125.2 35.841N 70.713E 100G 4.1 1.1 19 HINDU KUSH REGION, AFGHANISTAN 181138.9* 2.544N 126.939E 91D 4.4 1.4 22 NORTHERN MOLUCCA SEA 184611.8* 19.140N 39.115E 10G 4.0 1.3 18 RED SEA 220203.6* 47.325N 152.179E 33N 3.8 0.3 8 KURIL ISLANDS 221843.0* 27.575S 65.446E 10G 4.1 0.9 8 SOUTH INDIAN OCEAN 223035.6 27.601S 65.575E 10G 5.3 5.5 1.2 91 SOUTH INDIAN OCEAN 223924.2* 21.354S 178.390W 500G 4.4 0.6 20 FIJI ISLANDS REGION 233207.2 20.298N 45.648W 10G 4.4 0.9 27 NORTHERN MID-ATLANTIC RIDGE 235940.0* 27.633S 65.296E 10G 4.6 1.2 14 SOUTH INDIAN OCEAN AUG 01 033607.5* 45.708N 97.209E 33N 5.2 4.7 0.9 31 MONGOLIA 040823.1? 0.11 N 122.90 E 149D 5.5 0.8 13 MINAHASSA PENINSULA, SULAWESI. Mw 5.5 (HRV). Felt at Gorontalo and Tolitoli. 044920.9? 27.08 S 65.52 E 10G 5.4 4.7 1.1 11 SOUTH INDIAN OCEAN 054422.8 37.407N 104.227W 5G 0.9 10 COLORADO. mbLg 3.8. Felt at Trinidad 055554.1 37.375N 104.194W 5G 0.8 8 COLORADO. mbLg 3.2 (GS). 091436.0? 4.76 S 148.29 E 33N 4.9 0.8 13 BISMARCK SEA 100920.8? 18.11 S 169.19 E 33N 4.6 1.3 15 VANUATU ISLANDS 103525.3* 8.954S 152.750E 33N 4.6 1.1 20 D'ENTRECASTEAUX ISLANDS REGION 121548.0& 18.900N 155.250W 10G 4.2 11 HAWAII. . 191049.5* 56.115N 164.367E 33N 4.2 1.0 21 KOMANDORSKY ISLANDS REGION 215147.8 17.794S 70.543W 74D 4.9 0.8 48 NEAR COAST OF PERU. Felt (III) at Arequipa and Ilo; (II) at Mollendo and Moquegua. AUG 02 005841.1? 31.98 S 70.20 W 120G 0.3 10 CHILE-ARGENTINA BORDER. MD 3.5 033544.8 33.149N 137.051E 388 4.5 0.9 50 NEAR S. COAST OF HONSHU, JAPAN 113612.9* 29.666N 67.806E 33N 4.7 0.8 25 PAKISTAN 114619.0& 44.980N 122.650W 27 12 OREGON. . MD 3.3 (SEA). Felt at Estacada, Lebanon, Sandy and Silverton. 120747.5* 22.119S 171.545E 33N 5.2 1.1 24 LOYALTY ISLANDS REGION 125530.1 10.690S 161.510E 33N 6.3 7.1 0.9 76 SOLOMON ISLANDS. Mw 6.9 (GS) 151138.3 82.220N 1.590W 0G 0 NORTH OF SVALBARD 154440.7% 33.656S 71.764W 20G 0.2 11 NEAR COAST-CENTRAL CHILE. MD 4.4 162335.6? 26.87 S 177.49 W 33N 5.6 5.7 1.0 37 SOUTH OF FIJI ISLANDS 175254.4% 33.689S 72.008W 10G 0.5 10 OFF COAST-CENTRAL CHILE. MD 3.4 181216.2* 21.218S 68.312W 117? 4.5 1.3 12 CHILE-BOLIVIA BORDER AUG 03 001425.2? 24.38 N 143.96 E 33N 5.1 4.5 0.7 31 VOLCANO ISLANDS REGION 010750.6* 18.382N 111.119W 10G 4.4 0.9 17 REVILLA GIGEDO ISLANDS REGION 044553.5* 73.266N 6.634E 10G 4.7 1.3 16 GREENLAND SEA 061516.2 44.485N 114.267W 5G 3.6 0.7 23 WESTERN IDAHO. ML 4.3 (GS). Felt at Challis and Salmon. 095138.6* 27.524S 65.537E 10G 5.1 1.2 21 SOUTH INDIAN OCEAN 111356.5* 54.120N 163.049W 33N 4.5 1.2 12 UNIMAK ISLAND REGION AUG 04 064832.7* 7.859S 128.783E 33N 5.1 1.7 26 BANDA SEA 111432.9* 22.525S 68.733W 95D 4.8 1.1 13 NORTHERN CHILE 174114.6* 37.608N 21.214E 33N 4.4 1.3 24 SOUTHERN GREECE AUG 05 002514.5* 54.393N 161.542E 33N 4.9 1.0 36 NEAR EAST COAST OF KAMCHATKA 020857.8 15.256S 173.276W 41G 5.9 6.7 1.3 101 TONGA ISLANDS. Mw 6.7 (GS) 100052.9 34.587N 118.667W 5G 0.7 40 SOUTHERN CALIFORNIA. ML 3.0 100311.8 34.617N 118.638W 5G 0.7 24 SOUTHERN CALIFORNIA. ML 2.8 105444.2* 56.342N 164.011E 33N 4.9 0.6 25 KOMANDORSKY ISLANDS REGION 213917.2 1.744S 80.854W 33N 5.7 5.9 0.9 137 NEAR COAST OF ECUADOR. Mw 6.2 Felt in Guayas and Manabi Provinces. 223506.2* 15.602S 167.619E 130D 4.9 0.8 29 VANUATU ISLANDS 223822.1 20.597S 178.548W 551D 6.5 0.7 85 FIJI ISLANDS REGION. Mw 7.3 AUG 06 062932.3 38.798N 118.706W 5G 0.7 40 CALIFORNIA-NEVADA BORDER. ML 3.5 101314.6* 21.188S 175.639W 33N 5.4 4.8 0.6 59 TONGA ISLANDS 115210.4 34.094N 116.776W 10G 0.5 29 SOUTHERN CALIFORNIA. ML 3.3 150823.5 28.746S 67.549W 33N 5.0 4.2 0.9 26 LA RIOJA PROV., ARGENTINA. Felt (III) in the Famatina area. Note: Computer users can get faster access to the Weekly Seismicity Reports in any of three ways: 1. World-Wide-Web (WWW) access: http://quake.wr.usgs.gov 2. Anonymous FTP access: quake.wr.usgs.gov (in pub/www/QUAKES/WEEKREPS) 3. Email Access: (send email to michael@andreas.wr.usgs.gov) 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.