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 -- THIS 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 andy@pangea.stanford.edu Seismicity Report for Northern California, the Nation, and the World for the week of August 26 - September 1, 1993 Data and text prepared by Steve Walter, Barry Hirshorn, and Allan Lindh U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 Graphics by Quentin Lindh San Francisco Bay Area For the 7-day period ending at midnight on Wednesday, September 1, 1993 the U.S. Geological Survey office in Menlo Park recorded 18 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Four of these were as large as M2.0. This total compares to 20 earthquakes during the previous week (August 19 - 25), three of which were as large as M2.0. The only notable Calaveras fault activity was a pair of M2 events that, though they occurred four days apart, had nearly identical epicenters (#2 in figure 1). Both were located seven miles east of Morgan Hill at a depth of about 8 km. The only other event of note in the East Bay was a M1.7 on the northern Hayward fault late Sunday afternoon (#4/1). No felt reports were received for this earthquake, which was located along the foothills of eastern El Cerrito. The creeping segment of the San Andreas was almost completely quiet except for a M2.9 three miles northwest of San Juan Bautista on Monday evening (#5/1). Though no reports were received, it is likely that this earthquake was felt locally. To the north, along the Peninsula segment, a M1.2 occurred early last Thursday morning about 4 miles southeast of Pacifica (#1/1). Though the epicenter was less that a kilometer from Interstate 280, which parallels the San Andreas along much of the Peninsula, the earthquake was too small and too deep to have been felt locally. Two earthquakes occurred offshore of Santa Cruz during the week. The first was a M1.8 last Saturday evening that was located about 30 miles southwest of Santa Cruz (#3/1). This event may have occurred on the northern end of the Sur-Nacimiento fault that crosses the outer reaches of the Monterey Canyon. On Tuesday afternoon, a M2.1 occurred on the San Gregorio fault about 10 miles southwest of Santa Cruz (#6/1). This is nearly the same location as a M2.0 that occurred a week earlier. Northern & Central California After an unusually quiet week from August 19-25, seismicity in the Cape Mendocino area picked up again last week with nearly a dozen M2-3 earthquakes at the Cape and out along the fracture zone (#3,#5/2). Half had focal depths of over 20 km, indicating much of this activity occurred within the underlying Gorda Plate. The northern Sierra Nevada were also a bit more active than usual with a trio of M2 earthquakes. The first occurred Sunday afternoon: a M2.0 that was located southeast of Lassen Peak and about six miles west of Chester (#4/2). Then on Monday a M2.1 occurred about 15 miles northeast of Red Bluff (#7/2), followed on Wednesday by a M2.5 about 13 miles northwest of Portola (#8/2). Activity continued down along the eastern side of the Sierra Nevada with a M2.3 east of Lake Tahoe last Thursday, a M2.2 about 20 miles northwest of Bridgeport on Saturday (#2/2), and a M2.0 late Sunday night in the eastern Mono Basin (#6/2). Central California was fairly quiet with only a couple small M2's on the creeping section of the San Andreas and a M2.1 on the Parkfield segment (#1/2). Long Valley Caldera Aftershocks continued in the Red Slate Mountain area, the location of a M4.5 earthquake on August 10. However, both the rate and magnitude of the aftershocks declined during the week with only two M2.1 events in the vicinity of the mainshock (#3/3). Additional earthquakes occurred to the north of the main aftershock zone, including a M2.7 near Laurel Mountain (#2/3) and a M2.4 just south of the south rim of the caldera (#1/3). Activity within the caldera was reduced from last week with only a few scattered earthquakes in the eastern end of the south moat area; all were smaller than M2. USA Seismicity (August 23 - September 1) According to the National Earthquake Information Center, there were several small earthquakes in the lower 48 states, outside of California, during the reporting period. Wyoming led things off with a pair of M3.0 earthquakes. The first occurred late on August 22 near the Continental Divide just southeast of Grand Teton National Park (#1/4). It was followed the next morning by a second M3.0 about 25 miles northeast of Rawlins (#2/4). The New Madrid seismic zone in the central U.S. was active, producing a M2.7 last Thursday evening that was felt in Jefferson, St. Francois, and St. Louis counties (#4/4). Finally, a M2.9 occurred last Saturday in northwestern Oregon; it was felt in the Scotts Mills, Woodburn, and Oregon City areas (#5/4). The Planet Earth (August 21 - September 1) The Java Trench, part of the boundary between the Indo-Australian and Eurasian plates, was exceptionally active during the past week with a number of moderate to strong earthquakes. These included a small cluster of earthquakes in the Andaman Islands area, a Mb5.8 in the Nicobar Islands area (#4/5), and Mb5.9 and Ms6.3 earthquakes along the south side of the Indonesian Island of Sumatra (#6/5). The northern and eastern boundaries of the Indo-Australian plate were also active with a M4.9 in Pakistan, a Mb5.0 in southern India, a Mb5.4 off the east coast of the North Island of New Zealand (#2/5), and numerous M4-5 events from Papua-New Guinea to Fiji and Samoa. Other earthquakes of interest on the planet include a Mb5.4 on the Chile Rise off the southern coast of Chile (#1/5), a Mb5.2 in the Dodecanese Islands of southeastern Greece (#3/5), and a Mb5.8 in the western part of the Caspian Sea (#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 93 AUG 26 748 23.65 40 21.11 124 28.19 18.60 12 1 .04 .4 .3 MEN 1.9 93 AUG 26 808 20.45 40 19.36 124 29.50 26.74 18 1 .10 1.3 .7 MEN 2.0 93 AUG 26 816 26.82 39 32.41 122 58.07 11.09 23 2 .09 .3 .5 BAR 1.5 93 AUG 26 836 41.61 38 48.49 122 46.31 2.70 24 .11 .3 .5 GEY 1.8 93 AUG 26 904 6.52 36 1.30 119 51.99 24.59 15 1 .38 2.7 3.0 COA 2.4 93 AUG 26 904 48.00 38 48.58 122 46.35 2.37 9 .03 .3 .6 GEY 1.3 93 AUG 26 906 51.71 38 48.68 122 46.36 2.48 8 .02 .3 .6 GEY 1.2 93 AUG 26 913 22.89 37 37.84 118 51.01 4.26 11 1 .09 .4 1.0 SMO 1.1 93 AUG 26 955 0.83 39 5.01 119 41.99 2.21 36 3 .14 .8 2.3 WAK 2.5 93 AUG 26 957 17.70 37 32.39 118 53.02 6.92 20 2 .14 .4 1.2 MOR- 1.4 93 AUG 26 1149 10.19 37 39.14 118 52.45 8.53 9 .03 .8 1.4 DOM 1.0 93 AUG 26 1309 37.47 36 34.44 121 1.49 8.74 21 1 .17 .4 .9 PAN 1.0 93 AUG 26 1311 50.38 37 36.28 122 25.56 8.57 15 2 .11 .4 .7 SFP 1.2 93 AUG 26 1356 20.50 38 49.21 122 47.89 3.79 23 .06 .2 .5 GEY 1.9 93 AUG 26 1419 33.57 38 47.28 122 46.49 2.34 21 .06 .2 .5 GEY 1.6 93 AUG 26 1532 16.68 37 38.17 118 54.89 8.19 17 2 .08 .4 .6 SMO 1.7 93 AUG 26 1541 49.28 37 38.22 118 54.78 7.82 12 1 .07 .5 .6 SMO 1.2 93 AUG 26 1555 28.47 37 29.74 118 52.77 0.76 8 .05 .9 9.2 MOR-- .9 93 AUG 26 1602 9.78 40 18.21 124 30.05 6.17 15 1 .10 .7 .5 MEN- 1.7 93 AUG 26 1649 44.17 37 12.79 121 38.68 6.58 13 .05 .3 .8 SFL 1.1 93 AUG 26 1655 0.95 37 34.98 119 0.68 2.15 9 1 .05 .4 1.7 SIL 1.2 93 AUG 26 1703 56.99 37 31.57 118 52.57 0.96 7 .08 1.5 8.9 MOR - 1.0 93 AUG 26 1913 51.56 37 25.68 118 43.84 6.67 10 .03 2.5 2.0 WCS 1.4 93 AUG 26 1923 13.47 36 33.92 121 8.63 8.56 20 1 .08 .3 .8 PIN 1.3 93 AUG 26 1924 13.43 37 33.11 118 52.47 6.41 8 .04 1.2 1.6 MOR 1.1 93 AUG 26 1943 47.82 37 31.72 118 52.71 5.53 12 .06 .4 1.0 MOR- 1.1 93 AUG 26 1955 54.01 37 19.96 121 41.91 7.23 26 1 .08 .2 .6 SFL 1.2 93 AUG 26 2031 44.40 36 2.82 120 35.28 3.97 8 .07 .6 1.1 SLA 1.1 93 AUG 26 2055 50.09 37 32.04 118 53.17 5.04 27 .13 .3 1.2 MOR 2.1 93 AUG 26 2120 38.30 37 31.83 118 52.29 1.63 8 .05 1.1 9.2 MOR - 1.0 93 AUG 26 2326 4.91 37 33.64 121 25.26 1.87 18 1 .08 .4 1.3 JQN- 1.6 93 AUG 27 36 1.71 37 20.37 121 42.23 9.15 8 .10 .6 1.0 ALU 1.5 93 AUG 27 109 46.63 37 38.76 118 51.38 6.91 10 .12 1.1 1.3 SMO 1.0 93 AUG 27 119 11.52 38 51.92 122 46.92 1.88 12 .04 .3 1.0 GEY 1.5 93 AUG 27 414 10.61 37 17.59 118 22.38 13.38 12 1 .08 .4 .9 OWV 1.2 93 AUG 27 424 28.35 37 36.09 118 53.17 3.71 21 .10 .3 .5 SHE 1.6 93 AUG 27 441 28.75 35 37.75 118 16.46 12.80 14 3 .14 .5 .9 WWF 1.5 93 AUG 27 458 54.52 38 45.35 122 42.76 2.54 16 .05 .2 .5 GEY 1.7 93 AUG 27 512 56.08 37 37.99 118 52.14 7.27 12 .10 .5 .9 SMO 1.2 93 AUG 27 514 8.43 37 37.66 118 51.94 8.95 12 .10 .8 .9 SMO 1.1 93 AUG 27 525 50.52 37 38.46 118 51.85 7.59 7 .07 .8 1.7 SMO 1.0 93 AUG 27 527 25.34 37 37.89 118 51.99 9.19 13 .09 .6 .9 SMO 1.1 93 AUG 27 610 8.58 37 33.68 118 52.77 7.00 26 .12 .4 .8 MOR 2.1 93 AUG 27 630 38.94 37 29.59 118 51.16 5.36 31 .11 .3 1.0 MOR 1.5 93 AUG 27 631 56.34 38 45.57 122 42.65 1.61 7 .04 .4 .8 GEY 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 93 AUG 27 648 19.40 38 36.80 122 48.80 5.17 14 .16 .5 2.0 ROG 1.1 93 AUG 27 742 9.19 35 58.80 120 31.44 11.91 31 .09 .3 .4 MID 2.1 93 AUG 27 824 57.49 36 7.76 120 3.89 8.66 15 .13 .7 .4 COA 1.9 93 AUG 27 831 22.82 37 31.62 118 52.68 4.51 14 .05 .6 2.4 MOR 1.5 93 AUG 27 853 27.26 36 8.70 119 59.64 6.49 12 .40 1.9 2.4 COA * 1.6 93 AUG 27 941 49.80 40 40.94 125 5.19 23.56 14 1 .18 3.315.2 DEL - 2.0 93 AUG 27 1000 55.62 37 36.17 118 53.34 3.67 37 3 .12 .3 .4 SHE 2.7 93 AUG 27 1040 6.46 37 36.86 118 49.27 5.74 29 .13 .4 .6 HCF 1.9 93 AUG 27 1254 33.89 37 31.87 118 52.73 4.63 17 .15 .5 1.5 MOR 1.7 93 AUG 27 1339 33.17 37 7.74 121 31.65 8.51 70 .07 .2 .4 CYN 2.5 93 AUG 27 1454 3.11 35 48.00 120 20.55 3.57 18 .09 .3 .9 GOL 1.6 93 AUG 27 1638 36.28 37 30.37 118 52.81 4.27 17 .10 .4 1.7 MOR- 1.4 93 AUG 27 1646 29.89 38 49.21 122 46.45 2.19 8 .09 .3 .7 GEY 1.1 93 AUG 27 1649 3.27 37 31.77 118 53.01 4.76 11 .05 .4 1.0 MOR 1.1 93 AUG 27 1906 19.67 37 37.31 118 57.78 7.86 16 .07 .4 .6 SMO 1.6 93 AUG 27 1916 34.62 37 34.29 118 53.11 6.14 38 2 .10 .3 .5 MOR 2.9 93 AUG 27 1926 58.01 37 35.93 118 53.30 3.79 18 .10 .4 .6 MOR 1.8 93 AUG 27 2008 42.32 38 47.60 122 46.49 4.82 12 .04 .3 .7 GEY 1.4 93 AUG 27 2117 51.05 38 3.74 120 24.68 2.02 9 2 .10 .4 9.1 YOS - 1.0 93 AUG 27 2339 12.12 37 34.29 118 53.08 6.48 21 .12 .4 .7 MOR 1.6 93 AUG 28 23 30.48 36 3.18 120 36.02 2.04 8 .09 1.2 1.3 SLA 1.3 93 AUG 28 143 35.47 37 30.62 118 52.70 0.54 14 .08 .9 6.7 MOR 1.6 93 AUG 28 218 6.73 37 30.72 118 53.02 0.65 23 .13 .4 8.9 MOR * 2.1 93 AUG 28 222 39.41 37 30.66 118 53.08 0.84 22 .13 .4 8.1 MOR * 2.1 93 AUG 28 229 21.31 37 30.54 118 52.87 0.01 13 .04 .5 7.8 MOR - 1.6 93 AUG 28 251 49.38 37 30.75 118 52.62 1.82 14 .11 .9 6.6 MOR * 1.7 93 AUG 28 328 3.27 36 58.86 121 13.62 0.00 9 .18 .6 8.6 ORT * 1.1 93 AUG 28 557 3.82 37 16.80 121 38.96 9.48 33 1 .05 .2 .4 SFL 1.3 93 AUG 28 630 35.22 37 34.44 119 0.43 2.01 8 .06 1.1 1.1 SIL 1.3 93 AUG 28 643 48.03 40 23.05 123 33.89 26.80 17 2 .12 .4 1.0 MEN 1.9 93 AUG 28 654 35.51 40 8.61 123 50.97 20.98 23 1 .16 .5 .3 MEN 2.1 93 AUG 28 655 8.57 37 34.05 119 0.73 1.85 23 .13 .4 1.8 SIL 2.2 93 AUG 28 754 6.09 38 49.53 122 46.78 2.67 18 .07 .2 .7 GEY 1.8 93 AUG 28 855 19.01 36 2.56 121 32.79 8.24 8 .03 1.1 7.0 SUR - 1.9 93 AUG 28 918 1.62 36 0.39 120 8.18 14.92 25 .13 .5 .9 COA 1.8 93 AUG 28 941 41.73 38 23.63 119 33.25 14.21 20 2 .23 1.1 6.1 WAK 2.5 93 AUG 28 954 46.42 40 21.73 123 56.46 6.19 20 1 .14 .4 .7 MEN- 1.5 93 AUG 28 1038 30.46 37 30.07 118 52.46 4.43 28 2 .14 .4 1.3 MOR 1.7 93 AUG 28 1100 4.74 37 28.35 119 2.08 1.75 9 .05 .5 9.1 SIL - 1.1 93 AUG 28 1213 43.01 37 39.01 118 53.36 2.27 7 .04 .4 .4 DOM 1.2 93 AUG 28 1222 40.46 38 47.21 122 46.39 2.48 17 .08 .2 .6 GEY 1.8 93 AUG 28 1328 56.11 37 38.57 118 56.43 5.14 13 .05 .4 .7 SMO 1.3 93 AUG 28 1351 44.84 38 49.27 122 48.05 3.73 8 .03 .4 .8 GEY 1.1 --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 93 AUG 28 1526 31.03 40 23.48 125 25.44 24.57 28 1 .26 3.019.9 MEN- 3.0 93 AUG 28 1533 59.76 36 27.38 120 9.66 19.18 21 .14 .5 .3 JQN 2.2 93 AUG 28 1711 15.48 38 44.65 122 26.04 5.16 34 1 .25 .3 1.3 GVL 2.0 93 AUG 28 1729 51.45 39 37.18 123 25.94 9.60 8 1 .06 .4 .8 MAA- 1.0 93 AUG 28 1816 6.11 37 2.44 121 28.87 6.32 72 1 .09 .2 .4 CYS 1.7 93 AUG 28 1826 52.68 40 32.92 123 32.53 10.73 12 1 .19 .6 .4 EUR 1.4 93 AUG 28 1940 16.35 37 30.30 118 52.34 2.06 9 .06 1.4 9.0 MOR - 1.0 93 AUG 28 2259 53.84 36 39.03 121 14.09 8.04 23 .05 .2 .6 STN 1.1 93 AUG 29 249 44.20 40 23.07 125 28.47 24.24 26 1 .23 2.717.8 MEN - 3.0 93 AUG 29 349 17.85 36 47.91 122 31.43 22.68 17 3 .22 1.8 1.0 POS 1.8 93 AUG 29 541 45.31 38 47.27 122 43.61 1.88 18 .07 .3 .6 GEY 1.6 93 AUG 29 547 55.61 37 31.92 118 52.04 1.91 8 .13 1.513.2 MOR - 1.1 93 AUG 29 636 50.44 40 18.06 124 22.64 7.87 10 1 .08 .9 .5 MEN 1.5 93 AUG 29 714 26.54 37 39.11 118 51.41 4.04 18 .14 .4 .9 DOM 1.8 93 AUG 29 737 44.82 37 32.85 118 52.42 0.04 9 .09 1.0 .6 MOR * 1.0 93 AUG 29 741 6.29 38 47.81 122 45.89 1.25 7 .06 .3 1.0 GEY 1.0 93 AUG 29 751 57.29 38 49.08 122 48.59 3.77 9 .05 .4 .8 GEY 1.3 93 AUG 29 819 11.31 35 53.14 120 25.64 11.16 26 2 .08 .3 .5 GOL 1.4 93 AUG 29 822 3.55 38 50.01 122 47.69 1.98 8 .02 .3 .7 GEY 1.2 93 AUG 29 854 15.59 38 45.81 122 43.86 1.54 13 .07 .3 .6 GEY 1.6 93 AUG 29 859 45.27 38 50.27 122 49.99 0.86 12 .09 .3 1.1 GEY 1.4 93 AUG 29 907 38.10 36 59.16 121 38.62 3.96 39 .15 .3 .6 SAR 1.4 93 AUG 29 919 52.10 39 18.40 123 12.27 0.07 30 3 .10 .2 1.2 MAA- 1.8 93 AUG 29 1039 33.78 40 18.32 124 43.38 13.55 12 1 .21 2.5 1.2 MEN 2.2 93 AUG 29 1222 56.12 37 3.80 121 55.04 16.53 27 3 .07 .4 .7 LOM 1.2 93 AUG 29 1300 23.03 38 47.79 122 46.02 1.48 9 .06 .3 .6 GEY 1.6 93 AUG 29 1300 29.65 38 47.04 122 46.60 1.75 9 .07 .3 9.7 GEY - 1.5 93 AUG 29 1302 41.51 37 31.61 118 52.77 1.42 13 .12 .511.8 MOR - 1.5 93 AUG 29 1330 36.24 37 39.27 118 52.98 4.00 14 .15 .6 .9 DOM 1.4 93 AUG 29 1350 54.57 40 20.62 121 19.05 6.37 14 3 .07 .4 1.2 ALM 1.4 93 AUG 29 1419 39.24 38 50.41 122 48.54 0.24 8 .10 .6 1.8 GEY * 1.1 93 AUG 29 1606 5.23 37 30.58 118 49.13 0.58 8 .03 .9 .7 MOR 1.3 93 AUG 29 1606 50.74 37 35.64 118 49.64 3.42 12 .17 .6 .9 MOR 1.2 93 AUG 29 1759 10.75 37 39.30 118 54.25 4.37 10 .02 .4 .7 DOM 1.2 93 AUG 29 1803 37.63 37 31.31 118 52.07 1.61 12 .13 1.111.0 MOR - 1.4 93 AUG 29 1811 55.89 37 40.57 118 50.43 1.16 7 .04 .4 .5 DOM 1.2 93 AUG 29 1956 53.10 39 14.64 123 17.08 6.99 19 3 .06 .2 .7 MAA 1.7 93 AUG 29 2144 55.00 38 47.95 122 45.10 1.92 16 .08 .3 .6 GEY 2.1 93 AUG 29 2213 16.46 40 19.32 121 20.19 4.10 22 2 .09 .3 .9 ALM 2.1 93 AUG 29 2248 41.77 38 45.09 122 42.63 1.37 10 .18 .6 1.3 NAP 1.5 93 AUG 29 2309 57.40 37 55.36 122 17.31 11.28 45 4 .19 .3 .6 HAY 1.7 93 AUG 29 2321 5.61 40 32.79 123 32.35 10.65 14 1 .23 .7 .5 EUR 1.7 93 AUG 30 37 26.86 38 49.45 122 47.93 4.12 9 .05 .3 .9 GEY 1.2 93 AUG 30 105 31.61 38 48.59 122 46.92 0.64 13 .12 .3 .6 GEY 1.6 93 AUG 30 636 30.82 40 24.75 124 43.76 17.35 11 1 .10 1.6 .8 MEN 2.8 --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 93 AUG 30 636 50.25 40 24.57 124 44.51 17.42 13 1 .14 1.4 .6 MEN 2.8 93 AUG 30 704 51.46 38 50.41 122 49.34 2.72 12 .05 .3 1.1 GEY 1.4 93 AUG 30 715 50.06 38 1.55 118 47.57 9.66 31 4 .11 .9 2.6 MOL 2.2 93 AUG 30 734 31.68 36 33.05 121 8.45 5.33 43 .13 .3 1.0 PIN 2.1 93 AUG 30 813 57.11 36 41.13 121 18.76 4.01 19 .06 .2 .5 STN 1.9 93 AUG 30 836 56.81 39 23.18 122 14.04 24.15 27 2 .20 .5 1.1 SAC 2.1 93 AUG 30 937 53.46 37 35.92 118 53.22 3.25 7 .02 .7 .8 MOR 1.0 93 AUG 30 938 56.88 37 30.67 118 52.40 1.74 11 .13 .913.1 MOR - 1.1 93 AUG 30 951 54.53 37 39.58 118 50.39 1.20 16 .12 .3 .5 HCF 1.8 93 AUG 30 954 24.22 37 30.09 118 52.12 2.04 12 .13 1.312.4 MOR - 1.3 93 AUG 30 1240 49.31 37 39.20 118 50.61 1.82 15 .09 .3 .9 HCF 1.6 93 AUG 30 1241 36.21 38 47.25 122 46.49 2.18 7 .01 .3 .7 GEY 1.2 93 AUG 30 1302 40.57 37 37.71 118 51.76 7.48 13 .10 .6 .8 SMO 1.3 93 AUG 30 1344 9.31 38 49.15 122 47.80 3.73 8 .05 .3 .8 GEY 1.2 93 AUG 30 1351 28.78 37 37.66 118 51.74 7.35 16 .09 .5 .7 SMO 1.6 93 AUG 30 1414 32.60 37 37.65 118 51.83 6.74 14 .11 .5 .9 SMO 1.5 93 AUG 30 1442 31.82 37 38.52 118 52.23 6.62 9 .04 .7 .5 SMO 1.0 93 AUG 30 1623 31.58 37 37.59 118 51.75 7.66 10 .12 .7 1.0 SMO 1.0 93 AUG 30 1703 11.97 37 30.86 118 50.29 0.03 10 .14 1.3 1.4 MOR * 1.6 93 AUG 30 1803 13.57 38 48.99 122 48.55 3.87 8 .02 .3 .6 GEY 1.3 93 AUG 30 1926 50.07 37 2.41 121 28.74 6.45 43 1 .06 .2 .4 CYS 1.8 93 AUG 30 1956 41.79 37 32.30 118 52.26 1.90 8 .04 1.6 8.3 MOR - 1.1 93 AUG 30 2053 9.93 40 18.17 122 0.69 14.32 26 .17 .4 1.5 SHA 2.3 93 AUG 30 2308 40.54 41 18.62 123 30.94 37.44 12 1 .13 .7 1.1 KLA 2.2 93 AUG 30 2343 4.79 36 11.63 120 45.22 3.34 8 .04 .3 1.1 BIT 1.4 93 AUG 30 2354 2.73 36 28.66 121 2.71 2.73 21 .08 .3 .9 BIT 2.0 93 AUG 31 8 21.34 40 17.99 124 28.59 16.96 19 1 .09 .9 .2 MEN 2.8 93 AUG 31 122 38.32 36 51.63 121 35.81 6.79 75 .19 .3 .4 SJB 2.9 93 AUG 31 155 14.41 37 37.09 118 53.89 2.13 8 .07 .7 .4 SHE 1.5 93 AUG 31 427 20.42 35 35.19 119 53.32 17.16 27 2 .21 1.2 .7 BAK 2.3 93 AUG 31 441 2.62 37 39.01 118 50.10 5.62 10 .06 .4 .9 HCF 1.1 93 AUG 31 514 52.88 38 47.53 122 46.10 2.42 7 .03 1.4 3.9 GEY 1.1 93 AUG 31 614 2.63 40 24.58 124 24.29 20.79 23 1 .12 .8 .2 MEN 3.1 93 AUG 31 751 59.13 38 49.32 122 47.62 0.04 15 .13 .3 .9 GEY * 1.7 93 AUG 31 854 9.08 37 31.93 118 53.12 1.20 15 .10 .4 8.6 MOR - 1.6 93 AUG 31 909 55.41 40 21.45 124 28.48 17.31 11 1 .07 .5 .6 MEN 1.8 93 AUG 31 1023 27.66 36 2.77 120 34.79 4.43 7 .05 .8 .9 SLA 1.2 93 AUG 31 1105 52.96 41 17.16 122 5.63 6.93 8 .09 .5 2.1 SHA 1.0 93 AUG 31 1117 31.55 40 44.14 123 53.22 9.78 10 1 .15 .6 .6 EUR 1.2 93 AUG 31 1217 19.33 38 49.87 122 49.66 0.67 8 .10 .5 1.0 GEY 1.0 93 AUG 31 1729 9.88 41 19.65 122 7.60 12.38 9 1 .13 .8 .9 SHA 1.4 93 AUG 31 1757 56.06 38 47.31 122 45.00 0.79 8 .04 .3 1.0 GEY 1.3 93 AUG 31 1758 19.69 38 47.19 122 44.95 0.09 7 .08 .3 1.4 GEY 1.1 93 AUG 31 1820 8.41 38 47.13 122 46.27 3.05 8 .02 .3 .9 GEY 1.1 93 AUG 31 2239 15.23 36 55.74 122 11.97 2.19 43 .19 .7 2.1 MON 2.1 --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 93 AUG 31 2258 15.60 37 34.45 118 52.32 4.36 8 .13 1.3 2.6 MOR 1.7 93 AUG 31 2326 50.88 38 50.35 122 47.95 0.74 16 .07 .2 .8 GEY 1.9 93 AUG 31 2330 3.36 38 50.28 122 47.79 0.47 16 .16 .3 1.3 GEY 1.8 93 AUG 31 2334 32.43 37 7.81 121 31.80 7.72 91 .12 .2 .4 CYN 2.7 93 SEP 1 33 26.34 38 47.80 122 47.78 0.95 9 .10 .3 .7 GEY 1.1 93 SEP 1 230 36.50 37 31.80 118 53.18 0.85 9 .03 .7 7.8 MOR - 1.1 93 SEP 1 239 24.48 37 40.57 118 50.47 1.93 10 .07 .3 .5 DOM 1.1 93 SEP 1 244 51.19 37 40.50 118 50.49 2.09 10 .04 .3 .6 DOM 1.2 93 SEP 1 514 0.25 37 38.76 118 51.75 7.61 13 .07 .6 .7 SMO 1.4 93 SEP 1 712 5.59 40 18.66 124 44.61 14.36 13 .15 4.9 2.2 MEN 2.6 93 SEP 1 854 0.58 38 46.77 122 43.29 3.12 7 .03 .9 1.1 GEY 1.1 93 SEP 1 1032 6.97 37 32.07 118 53.00 2.17 13 .13 .910.8 MOR - 1.5 93 SEP 1 1135 33.97 37 31.41 118 52.29 1.52 15 .13 1.112.1 MOR - 1.4 93 SEP 1 1223 29.82 37 38.22 118 51.64 7.94 14 .09 .4 .7 SMO 1.5 93 SEP 1 1327 30.69 37 31.69 118 52.39 1.11 12 .12 .912.3 MOR - 1.5 93 SEP 1 1448 23.18 38 48.96 122 48.81 4.83 10 .11 .5 1.1 GEY 1.4 93 SEP 1 1529 49.28 41 11.60 121 53.71 18.25 7 .10 1.2 3.9 SHA 1.6 93 SEP 1 1716 1.11 36 36.05 121 11.91 3.08 15 .08 .3 1.2 PIN 1.9 93 SEP 1 1756 31.26 37 33.30 119 0.51 0.00 9 .13 1.6 2.6 SIL * 1.2 93 SEP 1 1818 29.81 40 17.56 124 21.03 8.67 21 .14 .6 .3 MEN 3.4 93 SEP 1 1900 25.90 37 32.93 118 53.94 1.00 8 .10 2.0 2.8 SIL 1.0 93 SEP 1 1940 59.20 39 52.71 120 41.18 5.49 15 .15 1.311.6 WAK - 2.5 93 SEP 1 2233 18.82 37 31.22 118 52.67 1.05 17 .15 .612.4 MOR - 1.7 93 SEP 2 135 34.10 38 51.05 122 49.76 1.12 8 .07 .4 1.0 GEY 1.1 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 ------------------------------------------------------------------------------- AUG 21 044944.1 29.819N 137.425E 513* 4.5 0.9 44 SOUTH OF HONSHU, JAPAN 080751.4* 46.282S 96.425E 10G 4.6 1.2 13 SOUTHEAST INDIAN RIDGE 085143.3 6.518N 126.941E 66? 4.7 1.1 35 MINDANAO, PHILIPPINE ISLANDS AUG 22 112947.2% 44.027N 7.126E 10G 0.3 10 NORTHERN ITALY. ML 2.3 (GEN). 144619.5% 10.664N 62.529W 92? 0.2 13 NEAR COAST OF VENEZUELA. MD 4.3 163102.9& 60.390N 152.100W 79 61 SOUTHERN ALASKA. . 194646.4* 0.579S 123.329E 33N 4.8 1.5 10 MINAHASSA PENINSULA, SULAWESI 234653.7* 36.929N 22.138E 33N 1.0 14 SOUTHERN GREECE AUG 23 051932.0* 17.698S 178.346W 600G 4.7 0.7 18 FIJI ISLANDS REGION 052144.3 29.955N 67.888E 33N 4.9 0.8 41 PAKISTAN 052950.3 43.383N 110.097W 5G 0.7 11 WYOMING. ML 3.0 (GS). 090316.7 25.296N 128.082E 33N 5.1 4.6 1.0 41 RYUKYU ISLANDS 100137.6? 14.15 S 167.33 E 150G 4.9 1.7 20 VANUATU ISLANDS 120545.7* 22.682N 99.276W 33N 4.1 0.9 24 CENTRAL MEXICO 120739.4 36.392N 142.079E 29 4.8 4.8 0.9 57 OFF EAST COAST OF HONSHU, JAPAN 131213.5 42.052N 106.903W 5G 1.1 14 WYOMING. ML 3.0 (GS). 133056.1* 12.856N 144.041E 33N 4.3 1.3 8 SOUTH OF MARIANA ISLANDS 152029.6 34.178N 117.010W 10G 0.5 8 SOUTHERN CALIFORNIA. MD 2.9 190535.4* 10.660N 94.526E 33N 4.2 0.6 6 ANDAMAN ISLANDS, INDIA 195107.4* 29.402N 67.835E 33N 4.7 1.2 27 PAKISTAN 201040.4* 10.590N 94.287E 33N 4.3 4.6 1.1 10 ANDAMAN ISLANDS, INDIA 210259.7 15.512S 172.906W 33N 5.1 5.0 0.8 64 SAMOA ISLANDS REGION 214031.6* 13.253N 146.003E 33N 4.6 0.8 16 SOUTH OF MARIANA ISLANDS AUG 24 004617.3 11.921N 86.594W 174D 5.0 0.9 77 NEAR COAST OF NICARAGUA 034410.6& 62.940N 150.760W 107 77 CENTRAL ALASKA. . 035647.8* 10.573N 94.288E 33N 4.5 1.6 7 ANDAMAN ISLANDS, INDIA 050517.7 50.998N 129.537W 10G 3.9 0.8 24 VANCOUVER ISLAND REGION 174731.8* 20.737N 71.494E 33N 5.0 1.4 26 SOUTHERN INDIA. Felt in the states of Gujarat and Maharastra. 191841.9 19.611N 145.546E 114* 4.9 1.0 42 MARIANA ISLANDS 225223.3* 10.374N 94.091E 33N 4.7 4.3 1.3 17 ANDAMAN ISLANDS, INDIA 231842.1* 10.581N 94.114E 33N 4.3 1.6 13 ANDAMAN ISLANDS, INDIA 233557.2* 10.445N 93.780E 33N 4.5 4.1 1.3 17 ANDAMAN ISLANDS, INDIA AUG 25 012741.2* 22.782S 66.367W 250G 4.5 0.8 28 JUJUY PROVINCE, ARGENTINA 022352.5* 43.101N 139.181E 33N 4.5 1.1 30 EASTERN SEA OF JAPAN 024627.7& 61.440N 146.590W 19 78 SOUTHERN ALASKA. . ML 3.1 052531.9* 44.875S 79.944W 10G 5.4 5.4 1.0 54 OFF COAST OF SOUTHERN CHILE. 060736.9& 63.050N 150.780W 120 94 CENTRAL ALASKA. . 064747.9? 6.32 S 147.15 E 111? 5.3 0.8 13 EASTERN NEW GUINEA REG., P.N.G. 072251.0? 10.59 N 94.24 E 33N 4.1 1.6 6 ANDAMAN ISLANDS, INDIA 085002.4& 67.500N 146.010W 17 65 NORTHERN ALASKA. . ML 4.3 093951.5* 28.012S 66.578W 155* 4.5 1.1 31 CATAMARCA PROVINCE, ARGENTINA 155653.4 8.438N 138.296E 33N 5.2 4.8 1.1 57 WESTERN CAROLINE ISLANDS 163535.8* 3.678S 128.137E 121* 5.1 1.2 11 SERAM, INDONESIA AUG 26 013000.1* 35.934S 178.331E 33N 5.4 5.4 0.7 21 OFF E. COAST OF N. ISLAND, N.Z. 014309.8 8.735S 110.250E 60G 5.2 1.5 19 JAWA, INDONESIA 033242.7 5.432S 154.201E 135D 5.4 1.0 79 SOLOMON ISLANDS 100357.1 36.682N 28.092E 33N 5.2 1.1 115 DODECANESE ISLANDS. ML 4.9 (THE). Felt on Rhodos and Kos, Greece. 114616.1 59.954N 141.259W 10G 4.7 0.8 28 SOUTHEASTERN ALASKA. Felt (V) at Cape Yakataga and Icy Bay. 115217.4 59.976N 141.195W 10G 4.6 0.9 30 SOUTHEASTERN ALASKA. Felt at Icy Bay. 115943.9* 17.511N 100.729W 29D 4.6 0.9 39 GUERRERO, MEXICO 233642.0& 62.350N 151.160W 82 55 CENTRAL ALASKA. . 235049.6& 63.260N 151.120W 6 75 CENTRAL ALASKA. . ML 3.4 AUG 27 000832.8? 37.77 N 90.52 W 5G 1.2 4 EASTERN MISSOURI. mbLg 3.3 (GS). MD 3.3 (SLM). Felt in Jefferson, St. Francois and parts of St. Louis Counties, Missouri. 011557.8 59.928N 140.991W 10G 0.7 70 SOUTHEASTERN ALASKA. ML 3.8 014523.6* 17.605N 100.707W 33N 4.7 0.9 44 GUERRERO, MEXICO 051115.8 59.964N 141.023W 10G 0.9 71 SOUTHEASTERN ALASKA. ML 3.7 064044.1* 12.972N 145.737E 33N 4.2 0.7 6 SOUTH OF MARIANA ISLANDS AUG 28 005858.8* 67.751N 163.516W 33N 3.9 1.1 18 NORTHERN ALASKA 025351.9* 18.648N 146.222E 33N 4.7 0.6 21 MARIANA ISLANDS 135142.7 7.025N 126.856E 33N 5.0 0.8 44 MINDANAO, PHILIPPINE ISLANDS 201444.6 6.492N 94.739E 122D 5.8 0.9 120 NICOBAR ISLANDS, INDIA. Mw 5.9 212540.4& 45.049N 122.632W 16 37 WASHINGTON-OREGON BORDER REGION. . MD 2.9 (GS). Felt in the Scotts Mills-Woodburn-Oregon City area, Oregon. AUG 29 043513.0 61.716N 147.923W 10G 1.1 12 SOUTHERN ALASKA. ML 3.2 (PMR). Felt (II) at Palmer. 084040.4 18.211N 100.515W 70G 4.7 0.8 55 GUERRERO, MEXICO 095755.7* 6.934S 129.846E 150G 5.6 1.3 20 BANDA SEA AUG 30 195928.8 17.590S 178.400W 600G 5.0 0.8 59 FIJI ISLANDS REGION AUG 31 065526 Q 41.9 N 49.7 E 33N 5.8 0.5 48 CASPIAN SEA SEP 01 004122 Q 31.8 N 141.8 E 33N 5.7 0.9 75 SOUTH OF HONSHU, JAPAN 114842 Q 4.2 S 102.7 E 100 5.9 0.7 86 SOUTHERN SUMATERA, INDONESIA 140319 Q 3.1 N 96.3 E 33N 6.3 1.1 92 NORTHERN SUMATERA, INDONESIA Notes: 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.