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 March 13 - 19, 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, March 19, 1997 the U.S. Geological Survey office in Menlo Park recorded 24 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Five were as large as M2. This total compares to 18 earthquakes during the prior seven day period (March 6 - 12), seven of which were as large as M2. Several of the week's larger earthquakes occurred on the creeping segment of the San Andreas. Largest of these was M3.1 last Thursday afternoon that was located about eight miles southwest of Hollister (#1/1). It was followed by half a dozen smaller shocks, the largest a M2.0 early last Friday morning. On Tuesday morning a M2.3 occurred to the southeast, but still on the creeping segment, about 10 miles southeast of Hollister (#4/1). Other events of note include a trio of M1's west of San Francisco, aftershocks to last weeks pair of M3.5 temblors that were felt widely in the Bay Area (#2/1); a M2.0 on the central Calaveras just east of Milpitas (#3/1); and a M2.6 on the southern Sargent fault about three miles southwest of Gilroy (#5/1). Northern & Central California It was a very quiet week in northern California. The Cape Mendocino area experienced just one event as large as M2, a M2.2 last Friday about 30 miles west of Petrolia (#4/2). The Coast Range was nearly as quiet with a M2.3 west of the Maacama fault about 12 miles northwest of Ukiah (#2/2) along with the usual Geysers activity, this time capped by a M3.0 event on Sunday morning (#8/2). Minor activity occurred in the central part of the state. The largest event here was a M2.6 just after midnight Monday about 12 miles east of Kettleman City (#9/2). A pair of small M2's occurred on the central creeping segment of the San Andreas southeast of the Pinnacles National Monument (#1/2) and a M2.3 occurred on the northern Parkfield segment of the San Andreas about four miles northwest of Parkfield (#10/2). Activity along the eastern Sierra Nevada range included a pair of M2's in the Markleeville area (#6/2), a M2.4 just north of Mono Lake (#5/2), a M2.7 12 miles southwest of Big Pine (#3/2), and a M2.5 eleven miles west of Bishop (#7/2). Long Valley Caldera As has been the case for most of the year so far there were no earthquakes as large as M2 within the Long Valley caldera. South of the caldera there were two earthquakes as large as M2: a M2.0 last Thursday east of Convict Lake (#1/3) and a M3.3 Wednesday evening south of Red Slate Mountain (#2/3). USA Seismicity (March 10 - 19) The National Earthquake Information Center reported a M4.7 last Wednesday in the St. Lawrence Island region of Alaska that was felt at Gambell, the westernmost city on the island (#1/5). Last Friday a M3.6 occurred along the Idaho/Montana border that was felt in the local area (#1/4). On Sunday a M4.2 occurred beneath the southeast side of the Island of Hawaii (#4/5). That same day a M3.4 occurred about 60 miles southwest of Little Rock, Arkansas near the western end of De Gray Lake (#2/4). The largest domestic earthquake occurred Tuesday morning in southern California (#3/4). This M5.4 quake occurred about ten miles northeast of Barstow. It was strongly felt in the town, though it produced only minor damage, and was felt in Los Angeles, Orange, Riverside, and San Bernardino counties. The earthquake is considered an aftershock to the M7.3 Lander Earthquake of June 28, 1992. Tuesday's quake was located in "Barstow cluster" of the Landers sequence. The Planet Earth (March 10 - 19) The only large earthquake on the planet during the week was a M6.0 in the Sunda Strait of southern Indonesia (#5/5). It produced minor damage in Jakarta and was felt throughout western Jawa and southeastern Sumatera, Indonesia. Though smaller, a M5.5 near the south coast of Honshu, Japan caused more injuries with at least four people injured at Toyohashi, a coastal town about 150 miles southwest of Tokyo (#3/5). Finally, two M4.7 earthquakes occurred off the coast the central America last Thursday and were both felt in San Salvador, El Salvador (#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 MAR 13 1024 12.92 37 31.99 118 49.56 9.48 19 .06 .4 .6 MOR 1.5 97 MAR 13 1217 55.71 36 29.83 121 4.20 3.83 46 1 .06 .1 .2 BIT 2.3 97 MAR 13 1222 14.18 36 29.88 121 4.31 3.97 29 .06 .2 .3 BIT 2.1 97 MAR 13 1223 26.94 36 30.01 121 4.24 3.79 21 .07 .3 .4 BIT 1.2 97 MAR 13 1259 8.99 37 35.44 118 49.35 8.08 24 .06 .4 .4 MOR 2.0 97 MAR 13 1327 40.54 38 48.53 122 48.95 1.37 9 .02 .5 .3 GEY 1.0 97 MAR 13 1340 15.63 39 13.06 123 24.66 0.12 29 3 .12 .2 1.4 PAR 2.3 97 MAR 13 1345 9.29 38 48.46 122 48.89 1.47 8 .02 .3 .5 GEY 1.2 97 MAR 13 1621 35.42 38 49.40 122 48.45 4.17 7 .03 .5 .9 GEY 1.0 97 MAR 13 1717 51.76 38 49.77 122 45.70 0.97 12 .04 .2 .6 GEY 1.5 97 MAR 13 1719 45.46 37 38.55 118 47.32 4.64 12 .02 .7 .7 EMO 1.9 97 MAR 13 1719 57.65 37 38.57 118 47.45 4.35 11 1 .02 .8 .6 EMO .9 97 MAR 13 1738 2.85 36 4.46 120 37.46 2.77 7 .03 1.3 2.2 SLA 1.4 97 MAR 13 1934 15.83 40 5.66 123 46.21 22.17 10 .05 .6 .5 MEN 2.0 97 MAR 13 2040 17.74 37 28.83 118 37.59 11.69 19 1 .07 .3 1.2 RVL 1.7 97 MAR 13 2042 17.02 37 28.87 118 37.54 10.62 28 3 .08 .3 1.1 RVL 2.1 97 MAR 13 2052 20.00 40 3.01 123 49.36 15.04 7 1 .26 4.6 6.9 MAA # 1.4 97 MAR 13 2114 7.11 36 44.70 121 26.84 7.51 73 3 .21 .2 .4 SJB 3.1 97 MAR 13 2115 41.18 36 44.97 121 26.88 8.86 46 2 .22 .3 .5 SJB 1.6 97 MAR 13 2118 55.48 36 4.61 120 37.09 3.60 14 3 .03 .7 .6 SLA 1.4 97 MAR 14 27 39.89 38 48.39 122 48.29 3.27 23 .05 .2 .3 GEY 1.8 97 MAR 14 131 54.74 36 57.60 121 35.19 2.69 9 .15 .7 .8 SAR 1.0 97 MAR 14 209 16.89 37 38.14 118 52.63 7.90 14 1 .05 .3 .7 SMO 1.3 97 MAR 14 210 37.87 37 24.84 118 37.98 7.81 26 .08 .3 1.2 RVL 1.7 97 MAR 14 227 9.20 38 1.46 118 57.78 4.86 9 1 .06 2.4 6.7 MOL - 1.3 97 MAR 14 311 50.75 36 12.59 120 21.71 10.29 22 .03 .2 .3 COA 1.7 97 MAR 14 426 29.94 37 38.63 118 47.26 4.62 12 1 .03 1.2 .5 EMO 1.2 97 MAR 14 445 13.55 36 46.25 121 16.54 8.93 41 .05 .2 .3 PAI 1.5 97 MAR 14 457 48.22 36 44.95 121 26.69 7.55 39 2 .19 .3 .5 SJB 1.5 97 MAR 14 524 59.63 38 49.19 122 47.62 0.16 9 .10 .4 1.5 GEY # 1.4 97 MAR 14 548 14.59 37 32.21 118 51.45 8.65 23 .06 .3 .6 MOR 1.8 97 MAR 14 554 45.33 37 30.47 118 48.55 3.54 8 1 .04 1.4 2.5 MOR 1.2 97 MAR 14 1007 20.18 36 31.56 120 51.24 6.70 15 1 .17 .5 6.6 CRV # 1.3 97 MAR 14 1010 2.35 36 46.22 121 16.52 8.87 30 1 .06 .2 .4 PAI 1.1 97 MAR 14 1019 0.81 36 45.75 121 26.33 9.34 16 1 .05 .4 .6 SJB 1.2 97 MAR 14 1046 55.77 36 44.89 121 26.41 7.67 62 2 .18 .2 .4 SJB 2.0 97 MAR 14 1309 16.70 37 38.49 118 47.75 4.46 15 1 .03 .8 .4 EMO 1.3 97 MAR 14 1454 41.42 36 45.32 121 25.33 6.65 9 1 .10 .7 1.2 SJB .9 97 MAR 14 1636 44.36 38 46.63 122 43.57 1.63 11 .07 .3 .4 GEY 1.4 97 MAR 14 1827 33.38 36 18.07 120 14.23 11.72 26 .04 .5 .2 COA 2.2 97 MAR 14 1843 0.66 37 1.47 118 24.52 0.16 41 .20 .5 5.5 KAI # 2.7 97 MAR 14 1923 1.01 38 49.38 122 47.95 3.99 15 2 .01 .2 .4 GEY 1.4 97 MAR 14 1944 22.34 38 48.78 122 48.58 3.79 7 .02 .4 .7 GEY 1.2 97 MAR 14 2010 17.63 36 29.80 121 4.46 3.80 14 1 .02 .4 .2 BIT 1.3 97 MAR 14 2010 52.90 36 30.37 121 5.44 4.64 27 1 .06 .2 .5 BIT 1.8 --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 97 MAR 14 2011 43.76 36 30.68 121 5.50 4.71 23 .07 .2 .5 PIN .9 97 MAR 14 2236 23.47 37 6.21 121 48.94 5.06 32 1 .09 .2 .3 LOM 1.5 97 MAR 14 2250 32.54 37 33.98 118 42.48 5.53 9 .02 1.0 .7 CAS 1.2 97 MAR 15 41 49.54 36 16.95 120 51.07 7.34 25 1 .06 .2 .3 BIT 1.8 97 MAR 15 101 14.50 36 2.53 120 35.09 4.45 16 2 .05 .4 .4 SLA 1.5 97 MAR 15 205 29.27 38 51.07 122 50.42 1.87 7 .03 .8 1.3 GEY 1.0 97 MAR 15 329 45.36 36 30.98 120 51.73 3.58 22 1 .35 .6 6.8 CRV # 1.4 97 MAR 15 331 41.71 38 48.80 122 48.54 3.73 7 .02 .4 .7 GEY 1.2 97 MAR 15 426 31.08 36 29.98 121 4.41 3.67 28 1 .06 .2 .3 BIT 1.6 97 MAR 15 435 43.77 36 29.85 121 4.47 3.50 13 1 .04 .3 1.0 BIT 1.2 97 MAR 15 553 58.21 36 13.48 120 48.04 5.66 8 1 .08 1.0 .4 BIT 1.4 97 MAR 15 558 15.88 40 25.23 124 51.35 24.45 12 .10 3.510.1 MEN - 2.2 97 MAR 15 736 42.54 38 48.80 122 48.13 3.23 10 .04 .3 .5 GEY 1.4 97 MAR 15 750 43.29 36 57.56 121 35.10 2.70 56 .14 .1 .3 SAR 1.8 97 MAR 15 804 32.53 38 10.53 119 9.35 15.33 18 4 .25 1.2 1.0 MOL 2.4 97 MAR 15 807 27.02 37 21.90 121 20.79 2.22 10 .05 .5 9.1 HAM - 1.4 97 MAR 15 831 46.25 38 35.53 119 51.03 0.32 31 1 .10 .4 2.0 WAK 2.8 97 MAR 15 1919 9.96 37 25.49 118 34.39 10.52 27 2 .07 .3 .8 RVL 2.5 97 MAR 16 2 19.23 38 47.73 122 48.49 4.05 16 .03 .2 .4 GEY 1.4 97 MAR 16 22 6.56 38 47.78 122 48.45 4.24 8 .01 .3 .6 GEY 1.0 97 MAR 16 121 37.37 38 49.48 122 48.06 4.15 23 .04 .2 .3 GEY 1.9 97 MAR 16 127 46.41 38 50.91 122 50.34 1.84 19 .04 .2 .5 GEY 1.7 97 MAR 16 129 54.73 38 47.58 122 45.31 2.37 12 .05 .2 .6 GEY 1.4 97 MAR 16 335 8.96 36 4.55 120 37.03 3.21 24 2 .06 .4 .3 SLA 1.7 97 MAR 16 348 35.80 38 48.27 122 46.11 3.08 11 .02 .3 .6 GEY 1.5 97 MAR 16 413 44.55 35 59.44 120 32.34 5.89 9 .02 .9 1.2 MID 1.3 97 MAR 16 503 45.93 37 33.98 118 51.25 9.21 21 2 .05 .7 .4 MOR 1.4 97 MAR 16 540 26.12 38 46.56 119 44.73 4.72 11 .04 2.1 6.7 WAK - 2.3 97 MAR 16 646 44.15 38 49.32 122 48.22 4.27 20 .03 .2 .4 GEY 1.7 97 MAR 16 724 32.64 37 43.62 122 31.89 6.73 10 1 .04 .3 1.7 SFP 1.5 97 MAR 16 827 30.11 37 33.96 118 52.28 4.00 23 1 .09 .3 .7 MOR 1.8 97 MAR 16 1053 43.53 38 1.10 118 43.03 4.91 12 .03 2.0 1.8 MOL 1.7 97 MAR 16 1134 10.26 38 5.25 118 41.83 1.46 11 .05 1.6 7.2 MOL - 1.5 97 MAR 16 1303 25.76 38 47.52 122 46.71 2.32 18 1 .04 .2 .6 GEY 1.4 97 MAR 16 1419 33.49 38 46.66 122 43.24 2.70 21 .05 .3 .3 GEY 1.7 97 MAR 16 1424 6.11 36 28.75 121 3.15 5.70 25 .06 .2 .4 BIT 1.3 97 MAR 16 1456 1.42 36 33.71 121 3.06 8.15 24 1 .07 .3 .4 BVL 1.4 97 MAR 16 1821 23.62 38 45.42 122 43.07 2.20 11 .04 .4 .3 GEY 1.3 97 MAR 16 1824 35.14 38 45.48 122 43.34 2.35 43 .15 .2 .5 GEY 3.0 97 MAR 16 2036 32.67 38 48.26 122 48.89 4.36 8 .02 .3 .8 GEY 1.2 97 MAR 17 223 30.20 38 47.16 122 45.36 2.32 15 .03 .2 .5 GEY 1.4 97 MAR 17 252 17.94 36 34.44 121 4.31 10.19 22 1 .06 .3 .6 BVL 1.1 97 MAR 17 502 54.06 37 20.03 122 6.95 5.27 9 1 .02 .7 .5 BLM .9 97 MAR 17 703 3.76 39 9.88 123 3.41 6.88 13 .07 .4 .6 MAA 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 97 MAR 17 714 49.43 36 31.71 120 51.17 9.89 16 1 .16 .4 2.3 CRV 1.3 97 MAR 17 718 52.57 38 49.26 122 50.41 2.54 9 .03 .3 .7 GEY 1.5 97 MAR 17 1020 48.43 37 50.72 121 46.12 19.72 27 1 .09 .4 .3 GRN 1.8 97 MAR 17 1050 38.59 37 49.70 121 47.65 6.27 16 .19 .616.7 GRN - 1.4 97 MAR 17 1157 29.66 35 31.77 119 26.60 25.58 7 .18 1.6 6.7 BAK 1.7 97 MAR 17 1441 1.94 37 36.46 118 48.49 11.82 11 2 .04 1.3 1.3 HCF 1.3 97 MAR 17 1504 8.61 37 35.45 118 46.98 8.32 11 1 .03 1.1 .8 MOR 1.1 97 MAR 17 2011 38.95 36 30.10 118 15.35 11.31 11 4 .36 2.8 4.2 WWF 2.0 97 MAR 17 2026 25.40 39 9.34 123 10.30 4.61 7 .02 .4 1.8 MAA 1.3 97 MAR 18 44 6.41 36 35.01 121 11.01 2.41 11 .04 .3 .4 PIN 1.4 97 MAR 18 146 8.11 38 13.11 118 44.02 5.05 21 .07 1.3 9.6 MOL - 2.0 97 MAR 18 303 32.29 35 39.46 121 6.17 5.23 9 1 .04 .6 1.1 SSM 1.4 97 MAR 18 459 42.33 36 34.58 121 3.82 8.80 20 3 .08 .2 .6 BVL 1.1 97 MAR 18 833 15.70 36 7.03 118 3.80 2.98 11 1 .02 .5 2.0 WWF 2.1 97 MAR 18 857 45.13 36 43.36 121 22.24 7.92 23 3 .03 .2 .5 STN 1.3 97 MAR 18 859 1.26 36 0.82 119 45.06 23.85 49 1 .21 .3 .6 COA 2.6 97 MAR 18 1343 3.05 37 34.58 118 49.16 13.15 11 .03 .8 .9 MOR 1.1 97 MAR 18 1350 5.62 37 25.62 121 46.33 8.12 64 2 .06 .1 .3 ALU 2.0 97 MAR 18 1359 20.99 36 42.89 121 20.94 3.47 42 .12 .2 .4 STN # 2.3 97 MAR 18 1418 18.73 37 34.31 118 49.40 12.00 16 .04 .7 .6 MOR 1.4 97 MAR 18 1433 35.28 38 49.29 122 48.37 4.08 22 .04 .2 .4 GEY 2.0 97 MAR 18 1523 24.14 36 57.57 121 35.21 2.42 63 .19 .2 .5 SAR 2.6 97 MAR 18 1616 43.34 37 38.16 119 22.73 21.43 20 .11 .4 1.6 KAI 2.2 97 MAR 18 1728 55.36 38 49.41 122 48.49 3.77 7 .04 .4 .8 GEY 1.0 97 MAR 18 1734 22.20 38 47.49 122 44.47 1.94 15 1 .03 .2 .5 GEY 1.6 97 MAR 18 1743 29.83 35 56.21 120 29.05 5.72 40 5 .08 .2 .2 MID 2.3 97 MAR 18 1842 18.14 35 56.23 120 29.07 5.45 9 .02 .5 .6 MID 1.1 97 MAR 18 2046 16.00 38 48.64 122 48.21 1.81 8 .03 .3 .4 GEY 1.1 97 MAR 18 2057 0.96 38 48.33 122 48.18 2.19 12 .04 .3 .3 GEY 1.4 97 MAR 18 2137 3.99 38 47.71 122 44.87 1.13 8 .04 .3 .9 GEY 1.4 97 MAR 18 2324 3.45 37 38.86 118 53.48 7.39 8 .05 .7 .9 SMO 1.1 97 MAR 19 305 20.83 37 45.36 122 34.87 4.72 25 1 .04 .3 .5 SFP 1.7 97 MAR 19 320 32.72 38 47.77 122 48.54 4.04 9 .02 .3 .6 GEY 1.4 97 MAR 19 427 53.07 38 47.98 122 48.72 4.23 9 .02 .3 .6 GEY 1.4 97 MAR 19 558 43.83 36 52.31 121 28.77 5.94 30 .27 .4 .9 BUS 1.4 97 MAR 19 908 43.64 38 49.47 122 47.99 4.44 12 .03 .3 .5 GEY 1.4 97 MAR 19 908 56.79 38 49.33 122 48.04 4.59 17 .03 .3 .4 GEY 1.6 97 MAR 19 919 52.20 38 47.35 122 45.48 1.75 8 .02 .3 .6 GEY 1.3 97 MAR 19 934 18.66 38 49.35 122 47.82 3.75 8 .02 .3 .8 GEY 1.2 97 MAR 19 1133 19.12 37 45.23 122 34.07 5.74 16 .03 1.0 1.8 SFP # 1.5 97 MAR 19 1338 29.83 37 20.10 118 37.08 11.78 25 5 .36 1.2 1.4 KAI 1.6 97 MAR 19 1406 53.46 38 47.40 122 45.39 2.19 30 1 .05 .1 .3 GEY 2.0 97 MAR 19 1412 49.12 37 34.37 118 49.38 11.99 19 .04 .4 .6 MOR 1.6 97 MAR 19 1417 11.46 36 36.58 122 33.63 21.50 11 .4737.838.5 POS - 1.2 97 MAR 20 308 7.29 37 29.42 118 50.00 12.40 9 .12 1.8 4.8 MOR 3.3 --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 MAR 20 638 30.46 36 35.58 121 6.01 8.40 8 .05 .8 2.0 BVL 1.2 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 --------------------------------------------------------------------------- MAR 10 031222.4* 29.192N 103.086E 10G 4.4 1.2 20 SICHUAN, CHINA 083431.3* 18.999N 104.598W 33N 4.3 0.9 32 NEAR COAST OF JALISCO, MEXICO 175033.5 27.389N 92.732E 10G 4.5 1.1 32 EASTERN XIZANG-INDIA BORDER REG. 175514.3* 27.243N 92.414E 33N 4.5 1.5 39 EASTERN XIZANG-INDIA BORDER REG. MAR 11 000101.0 12.510N 143.676E 33N 4.7 1.0 28 SOUTH OF MARIANA ISLANDS 040214.7 44.505N 7.418E 10G 3.0 1.3 10 NORTHERN ITALY. ML 1.9 (LDG). 063926.9 5.926N 126.804E 33N 5.1 0.6 21 MINDANAO, PHILIPPINE ISLANDS 071702.8* 32.405N 142.613E 33N 4.4 1.2 17 SOUTH OF HONSHU, JAPAN 094631.6 35.642N 95.893E 47D 3.2 0.9 19 QINGHAI, CHINA 105600.1* 81.306N 5.334W 10G 3.1 1.7 15 NORTH OF SVALBARD 110118.6? 32.40 S 72.15 W 33N 0.8 9 OFF COAST-CENTRAL CHILE. MD 3.3 141746.9 25.027N 126.449E 33N 5.0 0.9 34 RYUKYU ISLANDS 143434.3* 11.691N 125.360E 33N 3.7 0.9 12 SAMAR, PHILIPPINE ISLANDS 165046.2* 16.532N 98.337W 33N 4.2 1.3 32 NEAR COAST OF GUERRERO, MEXICO 165320.8* 15.130N 122.815E 33N 3.8 1.3 13 PHILIPPINE ISLANDS REGION 175518.5* 24.014S 66.909W 200G 4.6 1.4 14 SALTA PROVINCE, ARGENTINA 183815.9 18.107S 176.725W 352D 4.8 0.7 58 FIJI ISLANDS REGION MAR 12 001557.1? 53.29 S 140.33 E 10G 4.7 0.9 8 WEST OF MACQUARIE ISLAND 072439.0? 34.36 S 72.16 W 5G 0.4 10 NEAR COAST-CENTRAL CHILE. MD 3.9 112750.2* 17.724N 146.060E 137* 4.4 0.7 17 MARIANA ISLANDS 113817.1* 21.368S 65.690W 300G 4.5 0.5 15 SOUTHERN BOLIVIA 130813.1? 32.43 S 71.87 W 25G 0.6 11 NEAR COAST-CENTRAL CHILE. MD 4.5 135006.5* 22.461S 67.301W 169? 4.0 0.9 9 CHILE-BOLIVIA BORDER REGION 145149.4 13.386N 120.859E 33N 5.2 5.0 1.2 47 MINDORO, PHILIPPINE ISLANDS 182944.0& 62.920N 169.720W 20 4.7 42 ST. LAWRENCE ISLAND REGION. Felt at Gambell, Alaska. 184549.3% 33.225S 70.354W 5G 0.3 7 CHILE-ARGENTINA BORDER. MD 3.0 221248.6% 34.233S 70.082W 5G 0.4 10 CHILE-ARGENTINA BORDER. MD 3.7 MAR 13 011210.9 42.789N 142.938E 129D 4.7 0.7 78 HOKKAIDO, JAPAN REGION 025525.4* 51.276N 176.857W 33N 4.4 1.1 32 ANDREANOF ISLANDS, ALEUTIAN IS. ML 4.7 (PMR). 025939.5? 39.92 N 39.98 E 10G 4.3 3.3 1.1 12 TURKEY 060616.7* 58.622S 25.239W 33N 4.9 1.0 11 SOUTH SANDWICH ISLANDS REGION 062758.4 36.411S 97.530W 10G 4.9 5.0 0.7 39 WEST CHILE RISE 065931.0* 14.263N 90.079W 150G 4.7 0.8 20 GUATEMALA 140412.3? 39.51 N 143.79 E 33N 5.0 0.2 5 OFF EAST COAST OF HONSHU, JAPAN 164906.3? 12.00 N 88.76 W 33N 0.7 10 OFF COAST-CENTRAL AMERICA. MD 3.8 Felt (II) at San Salvador. 165500.0* 46.391N 153.195E 33N 4.8 1.0 18 KURIL ISLANDS 180609.8 25.565N 123.790E 206D 4.9 1.0 108 NORTHEAST OF TAIWAN 203812.9* 30.105N 68.132E 33N 4.6 0.9 9 PAKISTAN 204121.3 4.194S 142.913E 117D 5.5 1.1 44 NEW GUINEA, PAPUA NEW GUINEA 211406.3 36.782N 121.456W 10G 0.7 13 CENTRAL CALIFORNIA. MD 3.2 (GM). 213440.7 12.378N 89.389W 33N 4.7 0.9 33 OFF COAST-CENTRAL AMERICA. MD 4.4 Felt (II) at San Salvador, El Salvador. 234243.9* 12.260N 89.475W 33N 4.7 0.7 16 OFF COAST-CENTRAL AMERICA. MD 3.9 Felt (II) at San Salvador, El Salvador. 234859.2 51.605N 16.173E 5G 0.5 12 POLAND. ML 4.1 (GRF), 3.7 (VIE). MAR 14 094258.3* 34.186S 109.552W 10G 5.1 5.0 0.8 34 SOUTHERN EAST PACIFIC RISE 114515.6* 38.095N 28.973E 10G 4.2 0.2 7 TURKEY. Felt at Denizli. 114816.9* 38.089N 28.892E 10G 0.6 7 TURKEY. MD 3.8. Felt at Denizli. 121235.5% 38.093N 28.972E 10G 0.3 6 TURKEY. MD 3.6. Felt at Denizli. 171832.0& 47.470N 115.780W 2 29 MONTANA. ML 3.6 (BUT). Felt in the epicentral area. 184301.0 37.026N 118.339W 10G 0.8 7 CALIFORNIA-NEVADA BORDER. MD 2.9 (GM). MAR 15 092411.3 7.394N 127.019E 33N 5.5 4.8 0.9 35 PHILIPPINE ISLANDS REGION 103735.3* 15.696N 93.017W 95D 4.5 0.8 20 NEAR COAST OF CHIAPAS, MEXICO 111734.1* 1.384S 145.386E 33N 4.7 5.5 0.9 13 ADMIRALTY ISLANDS REGION, P.N.G. 171854.5 43.742N 147.199E 33N 5.0 0.6 49 KURIL ISLANDS MAR 16 020943.2* 50.113N 179.685E 33N 4.3 1.0 14 RAT ISLANDS, ALEUTIAN ISLANDS. 042104.3? 13.60 N 90.61 W 33N 4.4 1.0 25 NEAR COAST OF GUATEMALA 055137.5 34.937N 137.478E 36D 5.5 4.8 0.7 112 NEAR S. COAST OF HONSHU, JAPAN. Mw 5.7 (HRV). At least 4 people injured at Toyohashi. Felt (V JMA) at Toyohashi and (IV JMA) Hikone, Mino-kamo, Nagoya, Omi-Hachiman and Shimada. Also felt slightly at Tokyo. 141901.1& 19.364N 155.080W 8 4.2 12 HAWAII. . MD 4.4 (HVO). 182435.0 38.742N 122.616W 5G 0.9 10 NORTHERN CALIFORNIA. MD 3.0 190728.1* 34.267N 93.488W 5G 0.5 7 ARKANSAS. mbLg 3.4 (GS). MAR 17 051343.6 18.911N 62.822W 33N 4.8 0.8 43 LEEWARD ISLANDS 052036.8 18.977N 62.847W 33N 4.9 4.9 0.7 38 LEEWARD ISLANDS 080548.0* 6.849S 105.824E 33N 5.8 6.0 1.1 26 SUNDA STRAIT. Mw 6.4 (HRV). Some minor damage at Jakarta, Indonesia. Felt throughtout western Jawa, Indonesia. Also felt in Lampung and at Palembang, Sumatera, Indonesia. 083658.6 18.673S 69.571W 83D 5.1 0.8 47 NORTHERN CHILE. Felt (IV) at Arica; (II) in the Iquique-Pozo Almonte area. 092318.7* 42.377N 142.127E 72D 4.9 0.4 33 HOKKAIDO, JAPAN REGION. Felt (III JMA) in the Shizunai area. MAR 18 152447.2 34.974N 116.827W 10G 4.7 1.0 63 SOUTHERN CALIFORNIA. MD 5.4 (PAS). Minor damage in the Barstow area. Felt in the Los Angeles, Orange, Riverside and San Bernardino Counties. 161923.3 34.984N 116.858W 10G 0.9 38 SOUTHERN CALIFORNIA. MD 3.7 164014.2 34.989N 116.851W 5G 0.7 25 SOUTHERN CALIFORNIA. MD 3.4 MAR 19 175041 Q 16.5 S 174.2 W 100 5.6 0.6 74 TONGA ISLANDS 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.