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 19 - 25, 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, August 25, 1993 the U.S. Geological Survey office in Menlo Park recorded 20 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Three of these were as large as M2.0, though just barely. This total compares to 26 earthquakes during the previous week (August 12 - 18), ten of which were as large as M2.0. It was a fairly quiet week in the area with only the San Gregorio fault showing any activity at all out of the ordinary. Early Sunday morning a very small M1.1 earthquake occurred along this fault just north of Ano Nuevo (#3 in figure 1). Just an hour later, a M2.0 occurred on the southern end of this fault (#4/1). This small earthquake, located eleven miles west of Santa Cruz, was followed about two hours later by a M1.6 aftershock. The San Andreas was quiet during the week with nothing more than a few M1 earthquakes. The first of these was a M1.3 late Saturday morning about one mile southeast of Pacifica (#2/1). The only other earthquakes were a pair of M1's later in the week about nine miles south of Hollister. The East Bay experienced minor activity on both the Concord and Calaveras faults. The Concord activity consisted of two M1 events, the largest a M2.0 early Tuesday morning that was located near the southern end of the Concord fault about 6 miles north of San Ramon (#5/1). A slightly smaller M1.6 had occurred at the north end of the Concord fault, just after midnight last Friday. The southern and central Calaveras experienced ten earthquakes larger than M1.0, the largest a M2.0 last Saturday morning that was located about 6 miles northeast of Milpitas (#1/1). Northern & Central California The largest earthquake in the region during the past week was a M3.5 in the Geysers area east of Cloverdale (#5/2). This is the third week in a row that this area has experienced a M3 earthquake. To the north, the Cape Mendocino area was quiet with only a few M2's along the fracture zone just west of the Cape (3/2). The northern Sierra Nevada experienced a couple of earthquakes worth mentioning. First, a M2.2 occurred early Monday morning about 9 miles south-southwest of Reno (#4/2). Second, a M3.2 occurred early Wednesday afternoon about 19 miles south of Portola (#6/2). No reports were received that this earthquake was felt but given its size and the time of day, it is likely that it was felt locally. Central California experienced several earthquakes larger than M2. Late last Thursday morning two earthquakes occurred about ten miles north of Coalinga (#1/2). The largest of these was M3.0; it was preceded by a M2.5 three minutes earlier. The following day a M2.0 occurred along the Big Sur Coast about 16 miles northwest of San Simeon (#2/2). Long Valley Caldera Aftershocks of the August 10, M4.5 earthquake continued in the Red Slate Mountain area. The largest of these aftershocks was a M3.7 early last Thursday morning that was felt in the city of Mammoth Lakes; it was preceded an hour earlier by a pair of M2 foreshocks (#1/3). This activity was actually 1-2 km farther north of epicenters of previous earthquakes in this sequence, suggesting the north-south oriented rupture is continuing to extend to the north. The full length of the rupture continued to be active with at least four M2 events along the southern half rupture, the largest of these a M2.8 Saturday evening (#4/3). Other earthquakes south of the caldera worth mentioning include a pair of M2.7's southeast of Convict Lake (#2/3) and a M2.4 on the Hilton Creek fault (#3/3). Activity picked up inside the caldera later in the week with M1 and M2 earthquakes scattered from the east end of the south moat north to the south edge of the resurgent dome. The first and largest of these caldera earthquakes was a M2.7 on Tuesday evening (#6/3). USA Seismicity (August 19 - 25) According to information supplied by the National Earthquake Information Center, during the past week only one earthquake in the lower 48 states outside of California. This M3.6 earthquake occurred early last Thursday afternoon in the Yellowstone region of Wyoming and was likely felt by visitors to the Park (#2/4). Activity in California, not already covered above, included a pair of M3's along the California-Nevada border (#1,#3/4) and a M4.7 last Friday evening that was widely felt in San Bernardino and Riverside counties (#3/4). This earthquake was an aftershock to the M7.3 Landers earthquake that occurred in April, 1992. This is the largest aftershock in some time but it caused little damage and no injury. The Planet Earth (August 14 - 25) The western Pacific rim continued to be the most active region on the planet, as is often the case. During the past week, the largest earthquake occurring in this region was a Ms6.3 beneath western highlands of Papua New Guinea (#3/5). Many buildings were reported to have been badly damaged in villages in the area but injuries were apparently only minor. No other M6 events occurred in the region but M5's struck in Halmahera, Indonesia (Mb5.4), Luzon, Philippines (Mb5.3), the Mariana Islands (Mb5.5 & Mb5.4), Mindanao, Philippines (Mb5.4 & Mb5.2), south of the Tonga Islands (Mb5.6), and in the Fiji Islands region (Mb5.7). The largest earthquakes in the western hemisphere were a Mb5.5 near the coast of Guatemala (#4/5), a Ms5.4 in the Dominican Republic (#2/5), and a pair of M4.7's in northern Alaska (#1/5). 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 19 701 59.08 40 36.01 122 51.67 13.39 11 .21 .9 1.4 KLA 1.7 93 AUG 19 712 6.18 37 30.58 118 53.05 4.86 30 .11 .3 1.4 MOR 2.0 93 AUG 19 718 0.68 38 50.42 122 47.33 1.42 8 .03 .3 .9 GEY 1.1 93 AUG 19 813 27.85 37 33.68 118 53.10 5.98 38 3 .13 .3 .6 MOR 3.0 93 AUG 19 851 22.84 37 33.47 118 53.09 5.97 32 .12 .3 .7 MOR 2.5 93 AUG 19 914 37.05 37 33.83 118 53.05 6.04 37 1 .12 .3 .7 MOR 3.6 93 AUG 19 1005 23.05 37 33.34 118 53.05 5.89 34 .13 .3 .8 MOR 2.7 93 AUG 19 1018 35.23 37 30.46 118 53.26 0.01 11 .03 .7 8.3 MOR-- 1.4 93 AUG 19 1020 37.26 37 30.36 118 53.26 0.02 13 .07 .4 9.5 MOR-- 1.5 93 AUG 19 1026 35.36 37 33.19 118 52.95 5.67 28 .11 .3 .8 MOR 2.2 93 AUG 19 1048 2.75 37 33.20 118 52.73 6.23 15 .11 .4 1.2 MOR 1.5 93 AUG 19 1050 58.56 37 34.01 118 52.58 6.58 11 .08 .7 1.0 MOR 1.0 93 AUG 19 1232 39.16 37 33.66 118 52.38 8.84 9 .06 .8 1.4 MOR 1.1 93 AUG 19 1252 37.00 37 16.00 121 38.60 7.51 37 1 .05 .2 .4 SFL 1.8 93 AUG 19 1258 41.94 37 32.45 118 53.21 1.90 7 .10 .911.6 MOR - 1.1 93 AUG 19 1321 51.58 40 13.34 124 8.35 12.52 14 1 .12 .6 .8 MEN 1.4 93 AUG 19 1513 12.03 40 34.46 121 35.62 2.94 8 1 .21 1.2 4.8 SHA 1.9 93 AUG 19 1607 23.65 37 16.62 121 38.82 9.00 30 1 .07 .2 .6 SFL 1.5 93 AUG 19 1621 4.16 37 31.48 118 52.66 2.08 10 .06 .4 7.5 MOR-- 1.1 93 AUG 19 1707 44.85 37 37.87 118 52.19 8.06 27 3 .08 .3 .4 SMO 2.1 93 AUG 19 1708 33.13 36 16.70 120 23.82 10.07 32 1 .09 .2 .4 COA 2.7 93 AUG 19 1711 31.22 36 16.76 120 24.04 9.30 55 .18 .2 .4 COA 3.0 93 AUG 19 1713 48.79 37 36.33 118 50.38 7.92 13 .11 .5 .9 SMO 1.6 93 AUG 19 1832 19.00 37 31.75 118 52.56 0.69 15 .13 .6 3.0 MOR 1.6 93 AUG 19 1833 33.64 37 38.35 118 51.69 8.18 13 .08 .5 .7 SMO 1.5 93 AUG 19 1935 49.18 37 33.66 118 53.04 4.97 12 .10 .8 1.1 MOR 1.7 93 AUG 19 2008 7.30 37 31.99 118 53.08 4.69 30 3 .11 .4 .8 MOR 2.1 93 AUG 19 2040 10.69 38 48.16 122 48.78 4.29 7 .01 .3 .8 GEY 1.0 93 AUG 19 2317 23.17 36 19.11 120 29.97 10.44 7 .13 .6 1.1 COA 1.5 93 AUG 20 35 12.27 37 31.60 118 52.67 2.04 10 .03 .7 7.8 MOR - 1.3 93 AUG 20 45 10.16 38 49.25 122 47.88 3.77 10 .07 .3 .7 GEY 1.5 93 AUG 20 114 1.39 38 47.67 122 46.20 0.83 11 .06 .3 .7 GEY 1.6 93 AUG 20 127 6.13 38 47.47 122 45.23 0.03 8 .02 .3 1.1 GEY * 2.0 93 AUG 20 154 18.35 38 49.83 122 48.35 0.04 12 .13 .3 1.3 GEY * 1.7 93 AUG 20 404 18.53 37 31.93 118 52.01 1.48 10 .16 .715.0 MOR - 1.1 93 AUG 20 617 15.17 37 37.42 118 53.45 2.00 15 2 .09 .3 .3 SMO 2.0 93 AUG 20 639 55.06 37 32.14 118 52.46 2.45 13 .11 .6 9.7 MOR - 1.5 93 AUG 20 817 50.05 37 29.10 118 52.32 0.44 16 .10 .7 9.2 MOR - 1.5 93 AUG 20 909 46.14 38 48.90 122 48.44 3.36 18 .06 .2 .6 GEY 1.7 93 AUG 20 1100 19.42 37 31.00 118 52.87 0.64 12 .12 .6 9.4 MOR- 1.0 93 AUG 20 1202 12.69 38 47.68 122 47.87 1.49 7 .02 .3 .5 GEY 1.6 93 AUG 20 1208 23.05 37 31.21 118 48.45 15.62 11 .05 .5 1.6 MOR 1.1 93 AUG 20 1311 26.44 37 37.83 118 49.74 9.49 11 .08 .8 .9 HCF 1.5 93 AUG 20 1342 48.08 37 31.65 118 53.08 0.17 17 .05 .3 3.7 MOR * 1.8 93 AUG 20 1350 7.50 38 49.23 122 48.22 3.37 15 .06 .3 .6 GEY 1.6 --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 20 1421 24.01 37 31.80 118 52.58 4.72 29 .12 .4 1.0 MOR- 1.6 93 AUG 20 1422 48.31 37 31.98 118 53.04 3.18 27 .15 .4 1.8 MOR- 1.9 93 AUG 20 1431 22.46 37 31.35 118 52.39 5.64 13 .05 .4 .9 MOR- 1.2 93 AUG 20 1453 48.86 37 32.03 118 52.51 1.81 12 .08 .710.3 MOR - 1.5 93 AUG 20 1514 55.59 37 33.95 118 50.22 6.44 9 .16 2.8 1.9 MOR 1.0 93 AUG 20 1516 15.11 38 46.37 122 44.76 2.67 14 .05 .2 .7 GEY 1.6 93 AUG 20 1611 47.90 37 31.61 118 52.90 5.35 16 1 .16 .6 1.7 MOR- 1.4 93 AUG 20 1702 37.40 37 16.32 121 38.61 8.81 38 .07 .2 .5 SFL 1.6 93 AUG 20 1825 46.36 37 31.56 118 52.86 2.11 9 .03 .5 8.4 MOR - 1.0 93 AUG 20 1928 5.59 37 7.57 121 31.57 2.61 8 1 .07 .7 .6 CYN 1.0 93 AUG 20 1958 53.60 37 31.61 118 52.99 3.66 21 .11 .4 1.4 MOR 1.9 93 AUG 20 2007 10.26 37 20.02 121 41.88 7.02 28 .07 .2 .6 SFL 1.5 93 AUG 20 2046 58.51 35 44.14 121 27.26 0.00 16 .43 3.315.0 SSM * 2.0 93 AUG 20 2052 2.81 36 33.84 121 9.28 3.76 15 1 .05 .3 .7 PIN 1.0 93 AUG 20 2052 35.15 37 32.92 118 26.50 8.16 10 .03 .4 .6 CHV 1.1 93 AUG 20 2213 38.33 38 49.26 122 47.91 3.55 9 .07 .4 .8 GEY 1.1 93 AUG 20 2230 53.90 37 39.73 118 54.10 5.86 8 1 .03 .9 1.0 DOM 1.0 93 AUG 20 2232 6.22 37 30.86 118 53.00 5.68 28 2 .14 .4 1.1 MOR 1.7 93 AUG 20 2247 8.05 37 34.54 118 50.72 6.64 22 .13 .5 .8 MOR 2.7 93 AUG 20 2316 55.42 37 39.25 118 54.00 6.03 13 .09 .4 .7 DOM 1.3 93 AUG 21 115 31.24 38 47.83 122 48.15 3.73 28 .08 .2 .4 GEY 1.8 93 AUG 21 120 16.30 38 23.68 118 24.09 6.09 14 1 .17 1.513.8 NEV-- 2.2 93 AUG 21 222 53.74 37 34.31 118 50.52 7.16 16 .06 .4 .6 MOR 1.5 93 AUG 21 238 10.12 37 37.61 118 50.27 10.28 21 .09 .4 .7 HCF 1.9 93 AUG 21 311 33.01 40 21.50 124 27.18 0.00 11 .25 2.5 4.2 MEN * 2.3 93 AUG 21 349 10.54 37 34.68 118 47.64 3.56 23 .13 .4 .9 MOR 2.4 93 AUG 21 450 50.50 37 31.80 118 53.06 3.94 7 .04 1.6 7.4 MOR - 1.2 93 AUG 21 452 25.82 36 42.73 121 21.47 2.90 8 .07 .4 .6 STN 1.0 93 AUG 21 527 20.40 37 33.86 118 49.55 5.27 10 .04 .5 .6 MOR 1.1 93 AUG 21 549 10.62 37 32.05 118 52.95 3.19 9 .03 .8 4.5 MOR 1.0 93 AUG 21 635 28.59 38 47.40 122 44.90 0.58 12 .07 .3 .8 GEY 1.6 93 AUG 21 817 31.96 37 58.94 122 3.39 13.72 8 .11 1.3 1.9 CON 1.6 93 AUG 21 854 2.73 37 30.93 118 51.28 1.10 8 .13 4.513.0 MOR - 1.3 93 AUG 21 958 2.80 38 49.53 122 47.66 2.29 16 .04 .2 .5 GEY 1.6 93 AUG 21 1205 45.53 37 32.30 118 53.78 2.04 10 .13 1.913.3 SIL - 1.6 93 AUG 21 1417 25.98 37 29.84 121 50.81 10.20 48 2 .13 .2 .5 MIS 2.0 93 AUG 21 1436 54.00 37 29.86 118 52.45 7.89 36 5 .12 .3 1.2 MOR 2.6 93 AUG 21 1819 49.94 37 37.46 122 28.07 7.73 14 1 .17 .7 1.0 SFP 1.2 93 AUG 21 1847 58.05 37 32.30 118 52.39 2.08 9 .14 1.212.7 MOR - 1.1 93 AUG 21 1911 53.83 38 41.87 119 39.14 0.64 12 2 .08 1.1 3.4 WAK * 2.1 93 AUG 21 1925 13.53 37 34.46 118 50.65 6.70 25 .13 .5 .7 MOR 1.8 93 AUG 21 1930 23.07 37 37.24 118 49.31 10.53 8 .05 .7 1.6 HCF 1.0 93 AUG 21 2001 6.99 38 46.34 122 43.17 2.53 21 .14 .3 .6 GEY 2.0 93 AUG 21 2208 5.28 39 10.01 123 12.89 5.92 16 .08 .3 1.3 MAA 1.5 93 AUG 21 2320 42.59 37 38.21 118 50.48 7.71 7 .02 .7 .5 HCF 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 21 2327 28.14 37 37.66 118 50.22 8.44 11 .06 .4 .8 HCF 1.1 93 AUG 22 44 18.19 35 58.15 120 30.99 8.46 7 .01 1.4 1.3 MID 1.1 93 AUG 22 56 20.06 37 33.31 118 53.14 4.46 11 .03 .5 1.1 MOR 1.1 93 AUG 22 114 39.16 37 29.51 118 52.44 5.91 30 .10 .3 1.1 MOR 2.8 93 AUG 22 301 9.25 38 49.27 122 46.56 2.34 8 .04 .3 .7 GEY 1.1 93 AUG 22 532 18.84 37 32.35 118 52.61 4.81 17 .11 .6 1.1 MOR 1.4 93 AUG 22 648 8.55 37 33.68 118 52.74 4.91 11 .04 1.0 .8 MOR 1.3 93 AUG 22 715 52.94 40 19.05 124 26.19 9.71 16 1 .04 .6 .3 MEN 2.1 93 AUG 22 1004 15.38 37 29.11 118 52.41 1.75 11 .04 .4 8.7 MOR - 1.3 93 AUG 22 1335 54.82 37 8.85 122 20.41 9.69 11 1 .11 1.3 1.4 ANN 1.2 93 AUG 22 1342 21.41 37 35.24 118 46.76 4.57 12 .10 .4 1.1 MOR 1.4 93 AUG 22 1351 33.45 40 29.07 121 29.04 4.97 11 3 .09 .7 .6 LAS 1.2 93 AUG 22 1352 30.75 40 28.63 121 28.95 4.01 23 3 .08 .3 .2 LAS 2.0 93 AUG 22 1414 5.75 38 47.17 122 44.92 0.25 8 .04 .3 1.2 GEY 1.1 93 AUG 22 1425 32.96 36 56.44 122 13.59 6.44 32 1 .11 .7 1.4 MON 2.1 93 AUG 22 1506 38.04 38 49.12 122 48.52 3.79 11 .04 .3 .7 GEY 1.4 93 AUG 22 1600 16.14 37 27.16 118 50.34 7.15 30 1 .10 .5 1.2 MOR 2.9 93 AUG 22 1601 8.64 36 58.14 121 27.48 5.51 55 2 .10 .2 .5 CYS 1.8 93 AUG 22 1618 44.18 38 51.70 122 51.84 1.76 9 .04 .3 .5 GEY 1.0 93 AUG 22 1627 16.77 37 29.19 118 50.65 1.92 7 .04 1.5 8.8 MOR - 1.0 93 AUG 22 1757 7.29 36 56.71 122 13.32 3.87 14 1 .07 1.0 1.8 MON 1.5 93 AUG 22 1835 14.72 36 58.04 121 27.48 4.20 17 .08 .3 .8 CYS 1.0 93 AUG 22 1849 51.11 38 47.65 122 45.98 1.49 9 .08 .3 .8 GEY 1.3 93 AUG 22 1900 38.29 37 34.61 118 50.44 6.66 29 .12 .4 .6 MOR 2.7 93 AUG 22 1903 3.77 37 34.48 118 50.24 7.11 17 .12 .5 .9 MOR 1.6 93 AUG 22 2005 16.28 37 34.46 118 50.28 7.31 18 .10 .5 .7 MOR 1.6 93 AUG 22 2022 21.62 37 30.56 118 52.12 0.42 14 .12 .610.4 MOR - 2.0 93 AUG 22 2119 4.31 37 32.91 118 52.68 5.45 14 .12 .5 1.0 MOR 1.5 93 AUG 22 2121 1.34 38 49.73 122 47.62 2.60 8 .02 .3 .7 GEY 1.0 93 AUG 22 2134 19.21 37 34.18 119 1.12 2.80 11 .08 1.1 3.0 SIL 1.8 93 AUG 22 2153 17.63 38 49.68 122 47.63 2.41 9 .04 .3 .7 GEY 1.2 93 AUG 22 2255 24.24 37 39.07 118 54.50 7.91 7 .02 .9 1.9 DOM 1.0 93 AUG 23 17 41.65 37 39.84 118 54.73 3.71 11 .09 .5 .7 DOM 1.2 93 AUG 23 40 29.29 37 29.80 118 52.10 1.76 7 .09 1.711.0 MOR - 1.2 93 AUG 23 116 26.33 35 57.89 120 31.00 12.04 10 .03 .9 .8 MID 1.4 93 AUG 23 155 23.38 37 29.57 118 52.17 4.89 22 .07 .3 1.1 MOR 1.9 93 AUG 23 253 10.87 37 31.78 118 52.55 1.27 12 .03 .6 7.4 MOR - 1.2 93 AUG 23 346 13.22 37 31.96 118 53.00 3.15 22 .08 .3 1.3 MOR 2.0 93 AUG 23 404 20.80 37 31.90 118 53.10 1.46 13 .08 .410.4 MOR - 1.5 93 AUG 23 442 53.97 37 17.41 119 26.80 33.30 18 4 .21 1.0 1.7 KAI 2.2 93 AUG 23 449 21.07 40 40.19 123 42.32 23.88 10 2 .10 .6 1.2 EUR 1.6 93 AUG 23 647 14.82 37 37.30 118 50.86 5.34 16 .11 .4 .7 SMO 1.4 93 AUG 23 713 54.40 37 32.48 118 52.61 5.68 11 .04 .7 1.2 MOR 1.0 93 AUG 23 726 55.66 40 21.98 124 25.89 18.96 13 1 .14 1.4 .4 MEN 1.6 93 AUG 23 839 44.26 37 20.25 121 42.20 6.73 19 .03 .3 .6 ALU 1.4 --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 23 844 1.71 38 49.91 122 47.95 0.59 15 .11 .3 .8 GEY 1.7 93 AUG 23 854 5.46 37 30.98 118 52.51 0.05 17 .10 .5 5.0 MOR * 1.5 93 AUG 23 1049 30.88 37 31.89 118 52.82 1.68 16 .09 .4 8.4 MOR - 1.6 93 AUG 23 1057 17.85 37 32.94 118 49.67 5.84 14 .17 .8 1.3 MOR 1.2 93 AUG 23 1109 2.76 39 25.00 119 54.83 0.45 27 1 .16 1.3 2.9 WAK- 2.4 93 AUG 23 1112 41.33 37 32.60 118 49.47 4.23 11 .08 .6 1.4 MOR 1.1 93 AUG 23 1322 55.98 37 37.77 118 53.08 6.51 12 .10 .4 .7 SMO 1.1 93 AUG 23 1503 26.78 38 48.66 122 49.92 1.84 65 .14 .1 .4 GEY 3.5 93 AUG 23 1506 56.77 38 50.14 122 50.27 1.28 11 .09 .3 .9 GEY 1.8 93 AUG 23 1509 31.39 37 30.77 118 52.79 0.95 13 .03 .4 8.2 MOR - 1.3 93 AUG 23 1512 54.43 38 48.78 122 50.21 2.25 7 .03 .4 .8 GEY 1.3 93 AUG 23 1521 28.25 38 49.59 122 50.15 1.27 21 .15 .3 1.0 GEY 2.0 93 AUG 23 1644 58.10 38 49.94 122 48.31 1.38 8 .11 .5 1.0 GEY 1.2 93 AUG 23 1728 51.19 38 49.63 122 49.51 2.37 8 .08 .5 .9 GEY 1.4 93 AUG 23 1739 39.50 38 49.56 122 49.40 2.38 17 .07 .3 .7 GEY 1.9 93 AUG 23 1841 40.95 38 49.70 122 49.33 2.83 8 .03 .4 .8 GEY 1.3 93 AUG 23 1851 55.62 37 32.57 118 53.23 5.78 38 5 .12 .3 .7 MOR 2.0 93 AUG 23 1905 15.06 37 32.09 118 50.02 0.84 7 .01 .8 .3 MOR 1.1 93 AUG 23 1927 12.33 37 15.69 121 38.49 5.16 7 .02 .4 .7 SFL 1.0 93 AUG 23 2115 54.61 37 37.30 118 50.99 5.25 13 .12 .5 .8 SMO 1.4 93 AUG 23 2212 7.00 36 50.26 121 24.60 7.98 30 .11 .3 .7 HOL 1.4 93 AUG 24 100 34.65 38 48.63 122 50.29 1.55 13 .09 .4 .8 GEY 1.6 93 AUG 24 109 35.46 37 31.84 118 50.36 0.14 11 .11 1.0 .6 MOR 1.3 93 AUG 24 112 33.41 37 38.31 118 51.42 3.43 11 .15 .6 1.5 SMO 1.1 93 AUG 24 117 52.02 38 49.40 122 47.87 3.73 8 .03 .4 .8 GEY 1.4 93 AUG 24 122 7.52 37 37.61 118 51.15 4.98 35 .17 .4 .6 SMO 2.7 93 AUG 24 310 18.07 37 37.75 118 53.98 1.63 7 .03 .4 .3 SMO 1.5 93 AUG 24 439 20.90 37 37.77 118 54.06 1.62 7 .03 .5 .3 SMO 1.6 93 AUG 24 535 43.04 37 34.89 118 50.27 8.04 11 .10 .7 1.1 MOR 1.1 93 AUG 24 730 47.28 38 47.23 122 45.43 1.73 8 .03 .3 .7 GEY 1.3 93 AUG 24 804 59.93 37 38.71 118 53.29 1.33 8 .03 .4 .3 SMO 1.5 93 AUG 24 807 56.16 40 18.53 124 33.35 11.96 7 .05 2.9 .7 MEN 2.3 93 AUG 24 855 40.98 37 39.42 118 51.93 4.85 9 .04 .5 1.1 DOM 1.0 93 AUG 24 908 1.14 38 48.00 122 49.60 3.04 11 .04 .3 .8 GEY 1.7 93 AUG 24 1055 9.32 37 30.89 118 52.48 1.56 10 .05 .9 9.3 MOR - 1.1 93 AUG 24 1111 7.45 37 37.38 118 50.95 4.85 18 .11 .4 .6 SMO 1.7 93 AUG 24 1126 48.88 37 52.52 121 59.50 4.30 7 .06 2.2 1.4 CON 2.0 93 AUG 24 1132 58.54 37 38.45 118 52.72 8.37 12 .08 .6 .8 SMO 1.7 93 AUG 24 1241 37.64 38 45.11 122 43.58 1.80 15 .08 .3 .6 GEY 1.8 93 AUG 24 1258 54.85 37 30.75 118 52.73 1.01 8 .07 1.2 9.6 MOR - 1.1 93 AUG 24 1353 27.95 37 30.75 118 52.75 1.13 11 .04 .8 8.5 MOR - 1.3 93 AUG 24 1358 28.85 37 34.63 118 48.00 13.08 10 .04 .5 1.4 MOR 1.0 93 AUG 24 1401 18.92 37 38.74 118 53.03 1.90 8 .04 .3 .3 SMO 1.5 93 AUG 24 1443 48.80 36 43.14 121 22.01 2.93 7 .05 .4 1.1 STN 1.3 93 AUG 24 1551 34.85 37 34.66 118 47.82 12.16 13 .06 .4 .9 MOR 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 93 AUG 24 1632 40.31 37 38.47 118 51.86 6.98 11 .09 .4 .9 SMO 1.2 93 AUG 24 1700 46.97 38 47.17 122 44.99 1.53 26 .11 .2 .9 GEY 2.2 93 AUG 24 1742 0.65 38 51.21 122 48.13 2.00 18 .07 .2 .8 GEY 1.5 93 AUG 24 1804 37.48 35 35.05 119 53.20 15.52 24 1 .22 1.2 .8 BAK 2.2 93 AUG 24 1819 29.80 35 36.17 119 50.97 14.64 18 3 .19 1.0 1.3 BAK 1.9 93 AUG 24 1823 25.12 35 35.81 119 51.77 15.48 25 2 .21 1.0 1.1 BAK 1.9 93 AUG 24 1925 55.43 37 37.27 118 51.07 5.36 17 .10 .4 .5 SMO 1.8 93 AUG 24 1932 6.18 37 37.46 118 50.80 5.91 11 .13 .5 .9 SMO 1.1 93 AUG 24 2025 26.01 37 37.87 118 51.92 8.33 13 .11 .5 .8 SMO 1.5 93 AUG 24 2027 52.36 37 37.60 118 52.54 8.87 24 .11 .4 .5 SMO 2.0 93 AUG 24 2028 54.16 37 37.96 118 51.80 9.50 11 .06 1.2 1.2 SMO 1.4 93 AUG 24 2031 2.40 37 37.90 118 51.15 6.86 8 .15 .9 1.7 SMO 1.1 93 AUG 24 2031 15.56 37 38.45 118 51.57 10.39 8 .08 1.1 1.7 SMO 1.2 93 AUG 24 2104 42.55 37 37.86 118 51.81 7.08 11 .12 .4 1.0 SMO 1.2 93 AUG 24 2202 19.67 37 37.99 118 52.24 8.02 9 .03 .6 .7 SMO 1.2 93 AUG 24 2319 1.32 37 32.67 118 53.01 5.93 38 4 .12 .3 .7 MOR 2.6 93 AUG 24 2338 48.42 38 50.70 122 49.75 0.63 12 .16 .5 1.4 GEY 1.5 93 AUG 25 147 43.16 37 38.67 118 52.67 4.69 37 2 .12 .3 .4 SMO 2.3 93 AUG 25 217 37.24 38 47.68 122 44.73 1.34 14 .07 .3 .6 GEY 1.9 93 AUG 25 354 7.74 39 31.78 122 54.71 4.07 17 2 .10 .3 .6 BAR- 1.6 93 AUG 25 804 25.24 40 17.29 124 22.07 20.63 12 1 .07 .9 .4 MEN 1.7 93 AUG 25 938 50.11 37 32.25 118 52.52 6.22 8 .08 1.3 1.8 MOR 1.0 93 AUG 25 940 36.11 35 46.23 118 1.43 9.17 14 2 .08 .4 1.1 WWF 1.8 93 AUG 25 1058 0.56 36 56.55 121 26.41 2.50 40 1 .09 .2 .9 HOL 1.9 93 AUG 25 1147 15.78 37 30.28 118 52.69 4.26 22 .12 .4 1.3 MOR 2.0 93 AUG 25 1331 23.72 37 32.28 118 52.07 4.89 7 .06 .9 1.5 MOR 1.1 93 AUG 25 1341 27.84 37 38.50 118 51.18 4.13 12 .08 .3 .9 SMO 1.5 93 AUG 25 1552 22.85 37 39.74 118 51.37 5.89 17 .12 .4 .8 DOM 1.7 93 AUG 25 1555 8.37 37 34.57 118 50.33 7.29 18 .10 .4 .7 MOR 1.5 93 AUG 25 1557 44.08 37 39.49 118 51.81 6.98 24 .12 .4 .7 DOM 2.1 93 AUG 25 1647 52.13 37 27.29 118 40.89 0.00 12 .10 .7 8.5 WCS - 1.4 93 AUG 25 1653 55.49 35 42.97 120 16.21 11.48 10 .04 .4 .9 GOL 1.2 93 AUG 25 1800 12.43 37 38.44 118 57.99 5.48 8 .12 .8 1.6 SMO 1.0 93 AUG 25 1809 55.02 37 37.89 119 1.50 5.46 11 .03 .6 .9 MAM 1.1 93 AUG 25 1840 24.20 37 31.15 118 52.47 1.19 7 .04 1.6 8.7 MOR - 1.0 93 AUG 25 1841 39.16 37 29.45 118 50.61 8.68 23 .09 .3 .9 MOR 1.7 93 AUG 25 1902 30.87 37 39.85 118 55.33 8.48 10 .15 1.8 1.8 DOM 1.0 93 AUG 25 1948 46.20 37 31.52 118 52.77 1.63 7 .03 1.5 8.5 MOR - 1.0 93 AUG 25 2021 10.28 39 31.86 120 24.91 14.79 23 .09 .9 3.0 WAK 3.2 93 AUG 25 2040 21.91 38 46.32 122 54.37 4.41 11 .07 .4 1.4 GEY 1.4 93 AUG 25 2240 26.01 37 38.46 118 53.16 2.66 12 .14 .5 .8 SMO 1.5 93 AUG 26 127 4.17 37 32.72 118 51.03 6.54 9 .08 1.3 1.4 MOR * 1.5 93 AUG 26 148 8.45 37 32.26 118 51.43 2.87 7 .10 1.0 9.7 MOR - 1.2 93 AUG 26 315 51.66 38 46.08 122 43.73 1.02 11 .06 .3 .6 GEY 1.7 93 AUG 26 410 48.71 37 31.26 118 51.59 1.50 8 .20 1.618.5 MOR - 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 14 012917.8 33.343N 132.466E 41D 5.1 4.3 1.0 59 SHIKOKU, JAPAN 021508.8* 12.654N 144.773E 33N 4.1 0.7 10 SOUTH OF MARIANA ISLANDS 035239.6? 37.66 N 70.95 E 33N 4.8 1.2 12 AFGHANISTAN-TAJIKISTAN BORD REG. 115730.7 36.970N 142.235E 33N 4.2 1.2 23 OFF EAST COAST OF HONSHU, JAPAN 143003.9 25.422N 101.373E 33N 4.8 4.7 1.1 39 YUNNAN, CHINA 223819.4? 13.22 N 143.84 E 33N 4.3 0.1 4 SOUTH OF MARIANA ISLANDS AUG 15 020202.4* 6.668S 132.450E 10G 4.0 1.5 6 TANIMBAR ISLANDS REG., INDONESIA 030605.9* 5.233N 94.543E 33N 5.1 1.1 29 NORTHERN SUMATERA, INDONESIA 031021.9 0.923N 25.866W 15D 5.3 5.3 1.0 84 CENTRAL MID-ATLANTIC RIDGE 044124.3 43.646N 147.460E 33N 4.5 0.9 32 KURIL ISLANDS jjj053902.9 7.658N 126.787E 65* 4.6 1.1 32 MINDANAO, PHILIPPINE ISLANDS 061856.3% 44.422N 7.199E 10G 0.5 10 NORTHERN ITALY. ML 2.4 (GEN). 091814.3* 41.975N 139.590E 33N 4.6 0.7 13 HOKKAIDO, JAPAN REGION 120544.4? 27.24 S 69.16 W 114D 4.3 1.1 26 NORTHERN CHILE 125104.3& 62.970N 149.850W 86 51 CENTRAL ALASKA. . 145720.8* 6.784S 131.635E 33N 1.3 8 TANIMBAR ISLANDS REG., INDONESIA 175907.7& 62.330N 149.450W 57 86 CENTRAL ALASKA. . ML 3.6 214435.0 34.035N 135.136E 18 4.4 0.9 15 NEAR S. COAST OF WESTERN HONSHU 235226.2% 44.257N 8.246E 5G 0.4 7 NORTHERN ITALY. ML 2.3 (GEN). AUG 16 032023.3% 47.321N 11.430E 10G 0.3 5 AUSTRIA. ML 1.5 (VIE). 060725.7 35.819N 115.744W 5G 0.8 13 CALIFORNIA-NEVADA BORDER ML 3.0 063624.2* 12.895N 145.309E 33N 4.2 1.3 6 SOUTH OF MARIANA ISLANDS 080712.3* 13.579N 143.944E 33N 4.3 0.6 6 SOUTH OF MARIANA ISLANDS 102747.3* 4.685S 152.610E 33N 5.0 0.8 17 NEW BRITAIN REGION, P.N.G. 123404.4* 45.966N 11.626E 10G 0.8 11 NORTHERN ITALY. ML 3.2 (VIE). 170442.4 15.187S 165.980E 33N 5.1 4.7 0.9 44 VANUATU ISLANDS AUG 17 032515.6* 4.137N 125.985E 33N 5.0 1.2 12 TALAUD ISLANDS, INDONESIA 105628.2* 9.012S 118.728E 33N 4.7 0.9 11 SUMBAWA REGION, INDONESIA 145914.1 42.562N 139.322E 33N 4.7 0.8 29 HOKKAIDO, JAPAN REGION 162604.4* 39.991N 20.656E 33N 1.3 21 GREECE-ALBANIA BORDER ML 3.8 172213.5* 13.265N 145.276E 33N 4.6 1.3 26 MARIANA ISLANDS. Felt (IV) at Agana and Yigo, Guam. 203513.1* 9.467S 158.066E 33N 4.6 4.3 0.7 10 SOLOMON ISLANDS 234005.9* 30.628S 71.948W 33N 4.8 1.2 32 NEAR COAST OF CENTRAL CHILE AUG 18 013751.5* 12.996N 145.660E 33N 4.9 1.6 31 SOUTH OF MARIANA ISLANDS 041823.1 43.149N 139.353E 33N 4.8 1.2 41 EASTERN SEA OF JAPAN 044035.3* 24.702N 121.676E 33N 4.6 1.0 14 TAIWAN 050511.2& 67.510N 145.900W 22 4.1 60 NORTHERN ALASKA. . ML 4.3 120915.3* 34.554N 26.260E 10G 4.6 1.1 32 CRETE. Felt in the Iraklion and Lasithi Districts. 121951.0 44.423N 149.099E 33N 4.7 0.8 41 KURIL ISLANDS 191435.8* 12.910N 145.046E 33N 4.6 0.7 10 SOUTH OF MARIANA ISLANDS 213432.6* 42.943N 139.612E 33N 4.6 1.0 10 HOKKAIDO, JAPAN REGION AUG 19 033618.5? 15.92 S 174.62 W 150D 4.3 0.9 26 TONGA ISLANDS 043108.1 1.912N 127.494E 125* 5.4 1.0 40 HALMAHERA, INDONESIA 062214.7 35.835N 115.812W 5G 0.6 17 CALIFORNIA-NEVADA BORDER ML 3.5 064826.1 13.276N 124.133E 64D 5.3 1.0 39 LUZON, PHILIPPINE ISLANDS 073344.5 34.092N 116.870W 5G 0.8 8 SOUTHERN CALIFORNIA. ML 2.7 080323.2 13.251N 145.452E 60G 5.5 1.2 108 MARIANA ISLANDS. Mo=5.2*10**17 Nm (PPT). Felt (III) at Agana, Guam. 081153.8 51.606N 171.203W 33N 5.4 5.3 1.2 101 FOX ISLANDS, ALEUTIAN ISLA 091336.5 13.285N 144.045E 33N 4.3 0.8 12 MARIANA ISLANDS 091437.7 37.572N 118.848W 5G 0.7 79 CALIFORNIA-NEVADA BORDER ML 3.5 103935.5* 13.523N 143.571E 33N 4.2 0.6 6 SOUTH OF MARIANA ISLANDS 133551.6 7.910S 146.470E 33N 5.3 0.7 27 EASTERN NEW GUINEA REG., P.N.G. 140129.4& 60.340N 152.510W 92 46 SOUTHERN ALASKA. . 152142.7 7.168N 126.808E 70G 5.4 1.1 68 MINDANAO, PHILIPPINE ISLANDS 153307.2 18.423N 70.370W 33N 4.9 5.4 1.2 109 DOMINICAN REPUBLIC REGION. Felt strongly at Santo Domingo. Felt throughout the Dominican Republic. 162329.2 28.890N 141.815E 33N 4.9 1.0 30 BONIN ISLANDS REGION 171131.5 36.257N 120.402W 15G 0.8 34 CENTRAL CALIFORNIA. ML 2.9 (GS). 183034.1* 53.091N 171.484W 118* 4.3 0.8 12 FOX ISLANDS, ALEUTIAN ISLANDS 194313.1 44.803N 110.941W 5G 0.7 42 YELLOWSTONE REGION, WYOMING. ML 3.6 (GS), 3.7 (BUT). 215205.7 7.150N 126.796E 33N 5.2 4.4 1.2 50 MINDANAO, PHILIPPINE ISLANDS 220133.4* 42.758N 145.890E 33N 4.7 1.2 18 HOKKAIDO, JAPAN REGION 221149.5* 13.431N 143.952E 33N 4.7 1.4 12 SOUTH OF MARIANA ISLANDS AUG 20 021108.7? 19.01 N 106.15 W 33N 4.4 1.3 28 OFF COAST OF JALISCO, MEXICO 034750.0? 18.87 N 106.15 W 33N 4.2 1.3 24 OFF COAST OF JALISCO, MEXICO 050655.2 5.946S 142.450E 33N 5.9 6.3 0.9 45 NEW GUINEA, PAPUA NEW GUINEA. Mw 6.4 (GS), 6.2 (HRV). Five people injured and damage in the Tari area. 071553.8* 51.296N 179.262E 33N 4.7 0.9 15 RAT ISLANDS, ALEUTIAN ISLANDS 112357.8* 15.568S 173.251W 33N 5.1 1.0 41 TONGA ISLANDS 115203.9 21.805N 142.934E 281D 5.4 0.7 73 MARIANA ISLANDS REGION 130608.5* 18.132N 102.632W 33N 4.2 1.1 37 MICHOACAN, MEXICO 165726.8* 50.610N 156.246E 46D 4.9 1.0 30 KURIL ISLANDS 185713.4 25.748S 175.234W 33N 5.6 5.1 0.7 70 SOUTH OF TONGA ISLANDS 211248.4* 12.679N 145.051E 33N 4.6 0.4 9 SOUTH OF MARIANA ISLANDS AUG 21 014637.3 34.008N 116.359W 10G 4.4 1.0 60 SOUTHERN CALIFORNIA. ML 4.7 (GS). Felt in San Bernardino and Riverside Counties. Also felt in parts of Orange County. 094236.6 21.026S 178.159W 434D 5.7 0.8 82 FIJI ISLANDS REGION 200338.1 67.421N 146.720W 10G 4.7 4.1 1.3 32 NORTHERN ALASKA AUG 22 100157.5* 13.425N 90.652W 33N 5.5 4.7 1.1 77 NEAR COAST OF GUATEMALA 180831.8 36.486N 117.614W 5G 0.7 36 CALIFORNIA-NEVADA BORDER ML 3.2 AUG 23 131512.4* 41.770N 139.320E 33N 4.8 0.6 31 HOKKAIDO, JAPAN REGION 150326.7 38.816N 122.767W 5G 0.8 43 NORTHERN CALIFORNIA. ML 3.5 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.