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 September 26 - October 2, 1996 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 October 2, 1996, the U.S. Geological Survey office in Menlo Park recorded 27 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Three were as large as M2. This total compares to 20 earthquakes during the previous seven-day period (September 19 - 25), two of which were as large as M2. Aside from a pair of M1's on the northern Hayward fault, the only activity of note was a cluster of six small earthquakes on the southern Peninsula, about two miles west of Portola Valley (#1/1). The activity began with a M2.5 event late last Friday morning that was not reported to have been felt. It was followed over the next eight hours by six M1 aftershocks. This area has seen similar clusters in the past, the largest in 1975 when about 30 earthquakes occurred over a 5-day period, four of which were as large as M3. Northern & Central California The Mendocino fracture zone produced half a dozen earthquakes, the largest a M4.0 early last Friday morning (see #2 in Fig 4). It was too far offshore to have been felt, as was a small M3.2 that occurred about 75 miles west of Cape Mendocino on Tuesday morning (#9/2). Minor M2 activity occurred along the fracture zone closer to shore. Two M2.0 subduction events occurred beneath the Eureka area, the first a 19-km-deep event early Monday morning whose epicenter was about 14 miles northeast of Eureka (#6/2). It was followed within the hour by a 27-km-deep event about 30 miles east of Eureka (#7/2). Activity in the Coast Ranges included a M2.2 on the northern Maacama about 30 miles southeast of Petrolia, a M2.2 on the Bartlett Springs fault southeast of Lake Pillsbury, and a M2.0 on the Rogers Creek fault southwest of Glen Ellen. The largest event in the region was a M3.1 last Saturday at the Geysers geothermal area (#2/2). Central California also experienced a M3 earthquake: a M3.1 Sunday morning about 23 miles northeast of Coalinga (#4/2). Activity on the creeping segment of the San Andreas with only one earthquake as large as M2, a M2.7 early Sunday about 18 miles east of King City (#5/2). The eastern Sierra Nevada experienced a M3.3 in the northern Chalfant Valley area (#3/2), a M2.5 in the eastern Mono Basin (#8/2) and a pair of M2 events east of Markleeville (#1/2). Long Valley Caldera Only a few small earthquakes occurred in the caldera, all located around the margin of the resurgent dome, none as large a M2.0. South of the caldera there were three events as large as M2, the largest a M2.5 last Thursday that occurred about four miles west of Toms Place (#2/3). USA Seismicity (September 22 - October 2) According to data provided by the National Earthquake Information Center the largest domestic earthquake was a M5.7 event in the central Aleutian chain about 100 miles southeast of Dutch Harbor (see #5 in Fig. 5). In the lower 48 states, the largest earthquake also occurred offshore: a M4.5 on the Blanco fracture zone off the central Oregon coast (#5/4). The most interesting earthquakes however were a pair of M3 events beneath western Washington (#1,#3/4). With focal depths of 48 and 56 kilometers, both earthquakes clearly occurred within the seismogenic zone caused by the underthrusting of the oceanic Juan de Fuca plate beneath western Washington. The Planet Earth (September 22 - October 2) The largest earthquake on the planet was a Ms6.4 near Samar, Philippine Islands, somewhat north of a M6.2 that rocked the central archipelago during the previous week (#3/5). Other events of note include a Mb5.7 along the India-Bangladesh border (#1/5), a Mb5.3 that produced some damage in Yunnan, China (#2/5), a Ms5.4 in Iceland (#4/5), and a Ms5.9 in the Arabian Sea (#6/5). 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 SEP 26 854 54.81 37 10.02 121 40.07 5.48 13 .08 .3 .7 SCV 1.2 96 SEP 26 908 31.86 38 27.13 122 31.10 7.09 33 2 .09 .2 .8 NAP 1.8 96 SEP 26 920 33.48 37 0.78 121 48.61 14.87 7 .03 1.1 2.1 LOM 1.0 96 SEP 26 1032 8.76 36 40.83 121 16.53 5.46 20 2 .05 .2 .4 STN 1.2 96 SEP 26 1133 50.77 40 26.26 124 0.58 25.50 9 .08 .8 1.2 MEN 1.6 96 SEP 26 1136 2.21 38 54.50 122 33.09 6.99 8 .05 .7 1.6 BAR 1.3 96 SEP 26 1225 47.36 36 40.52 121 16.81 5.39 7 .04 .5 1.0 STN 1.5 96 SEP 26 1243 59.83 37 40.21 118 50.55 2.73 18 .11 .4 .9 DOM 1.4 96 SEP 26 1250 50.85 39 37.54 122 44.32 2.50 7 .01 .7 8.3 SAC - 96 SEP 26 1253 23.87 37 40.27 118 50.75 1.94 17 .08 .3 .5 DOM 1.6 96 SEP 26 1255 17.83 36 6.56 120 34.46 8.74 18 1 .07 .7 .4 COA 1.5 96 SEP 26 1447 59.43 38 44.82 119 38.10 0.34 15 .13 1.0 1.8 WAK 2.2 96 SEP 26 1519 37.94 38 47.78 122 48.78 4.21 8 .02 .3 .8 GEY 1.0 96 SEP 26 1618 59.60 36 44.31 121 19.95 8.48 8 .02 .6 1.0 PAI 1.0 96 SEP 26 1624 58.01 37 38.22 118 56.29 6.96 8 .05 .6 1.1 SMO 1.1 96 SEP 26 1630 30.16 36 2.31 120 35.73 0.89 32 1 .09 .2 .6 SLA# 1.9 96 SEP 26 1645 21.88 37 29.69 118 51.35 7.66 19 .08 .4 .8 MOR 1.4 96 SEP 26 1759 53.87 40 27.76 124 43.90 19.89 21 .22 6.7 1.3 MEN 2.4 96 SEP 26 1832 8.31 37 37.85 119 24.08 6.56 21 1 .13 .611.5 KAI - 1.7 96 SEP 26 1948 23.93 41 4.93 124 43.86 14.19 11 .09 1.8 2.4 DEL 2.0 96 SEP 26 2006 6.88 37 29.91 118 51.42 7.58 31 .09 .3 .6 MOR 2.3 96 SEP 26 2007 15.54 40 20.51 125 7.89 0.22 12 2 .33 3.2 2.1 MEN 2.1 96 SEP 26 2132 21.16 37 37.95 119 24.46 6.62 8 .06 .5 9.5 KAI - 1.9 96 SEP 26 2323 50.34 37 33.52 118 45.33 5.28 33 1 .07 .2 .5 WCN 2.7 96 SEP 26 2343 17.05 35 35.43 118 21.08 14.86 12 .11 .5 1.1 WWF 1.9 96 SEP 27 107 24.04 37 56.47 118 8.05 5.01 18 .10 1.1 9.4 NEV - 2.1 96 SEP 27 349 43.20 36 27.12 121 0.39 2.10 14 .10 .4 1.5 BIT 1.5 96 SEP 27 835 13.97 36 31.82 121 6.84 2.44 12 .03 .3 .8 PIN 1.0 96 SEP 27 1107 54.13 37 37.82 119 23.39 9.10 36 1 .10 .4 2.4 KAI 1.9 96 SEP 27 1229 9.91 37 33.57 118 45.55 5.61 22 .07 .2 .6 WCN 1.4 96 SEP 27 1236 44.12 37 33.54 118 45.60 5.64 19 .07 .3 .6 WCN 1.4 96 SEP 27 1344 38.09 40 34.04 127 38.07 2.54 63 .2616.4 5.5 DR 3.5 96 SEP 27 1421 57.88 37 40.10 118 52.95 5.03 18 .12 .4 .7 DOM 1.5 96 SEP 27 1437 56.35 39 42.41 123 39.83 0.04 11 2 .52 2.0 7.6 MAA # 1.6 96 SEP 27 1514 9.76 39 37.71 123 22.74 8.31 10 .04 .3 .7 MAA 1.4 96 SEP 27 1629 9.73 38 52.82 122 48.95 1.99 10 .08 .3 1.1 GEY 1.6 96 SEP 27 1823 37.57 38 45.70 122 42.28 3.29 23 .09 .2 .5 GEY 1.8 96 SEP 27 1827 8.93 40 17.94 124 25.35 14.26 7 1 .06 1.3 1.0 MEN 2.1 96 SEP 27 1828 32.93 38 45.78 122 42.21 2.96 13 .08 .3 .6 GEY 1.5 96 SEP 27 1830 37.88 37 22.77 122 16.18 10.37 65 3 .12 .2 .4 BLM 2.5 96 SEP 27 1832 15.55 37 23.01 122 16.85 10.42 24 3 .09 .3 .6 BLM 1.6 96 SEP 27 1846 8.06 38 45.66 122 42.52 1.37 12 .06 .3 .4 GEY 1.7 96 SEP 27 2000 4.25 37 23.08 122 16.89 10.26 10 1 .10 .5 1.3 BLM # 1.6 96 SEP 27 2000 24.51 37 23.11 122 17.20 10.77 11 1 .09 .4 .9 BLM 1.1 96 SEP 27 2010 47.59 37 32.08 118 47.69 5.47 22 3 .09 .3 .5 MOR 1.3 --ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH N N RMS ERH ERZ DUR YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 96 SEP 27 2108 55.57 37 38.17 119 2.12 1.40 19 .12 .3 .3 MAM 1.3 96 SEP 27 2145 46.06 36 30.28 121 4.83 3.28 14 .07 .3 .4 BIT 1.3 96 SEP 27 2258 9.37 38 47.07 122 45.43 2.02 21 .06 .2 .5 GEY 96 SEP 27 2258 11.78 38 46.76 122 45.42 2.04 39 1 .08 .2 1.3 GEY 3.1 96 SEP 27 2300 45.15 38 47.06 122 44.94 1.21 39 .09 .2 .5 GEY 2.8 96 SEP 27 2306 30.00 37 38.14 118 54.49 2.79 22 .10 .3 .4 SMO 1.8 96 SEP 28 24 49.78 40 17.42 124 31.56 21.01 7 .08 3.2 .6 MEN 2.2 96 SEP 28 247 50.10 37 23.01 122 17.16 10.74 12 1 .07 .4 .9 BLM 1.1 96 SEP 28 247 59.02 37 23.00 122 16.75 10.00 12 1 .10 .4 1.2 BLM 1.0 96 SEP 28 329 9.06 38 47.59 122 45.00 1.86 15 .04 .2 .6 GEY 1.6 96 SEP 28 406 9.34 38 45.72 122 43.34 1.29 15 .07 .3 .4 GEY 1.8 96 SEP 28 406 39.06 38 45.77 122 43.30 1.04 7 .06 .5 .4 GEY 1.2 96 SEP 28 759 35.00 40 28.24 124 28.44 25.76 13 .07 1.4 .9 MEN 1.9 96 SEP 28 835 28.38 37 34.22 118 51.88 9.19 31 .07 .3 .5 MOR 2.4 96 SEP 28 837 15.63 37 22.31 121 43.96 6.25 33 .06 .2 .4 ALU 1.5 96 SEP 28 914 13.78 37 8.77 121 32.57 7.16 35 .06 .2 .4 CYN 1.2 96 SEP 28 1003 10.50 38 49.34 122 47.55 1.04 18 .07 .2 .4 GEY 1.9 96 SEP 28 1041 26.47 37 33.06 118 53.59 4.06 23 .08 .3 .8 SIL 1.5 96 SEP 28 1101 36.57 36 17.32 120 33.88 16.18 19 2 .18 .6 .6 COA 1.6 96 SEP 28 1111 23.49 38 54.71 123 10.51 0.19 9 .06 .4 1.4 PAR 1.3 96 SEP 28 1238 36.18 38 48.50 122 45.14 0.39 8 .05 .3 1.1 GEY 1.3 96 SEP 28 1355 11.23 38 55.27 122 32.61 11.33 7 2 .08 .9 1.7 BAR 1.0 96 SEP 28 1457 17.30 37 31.05 118 50.48 9.74 9 1 .11 1.5 .8 MOR 1.0 96 SEP 28 1637 14.43 36 35.44 121 4.63 5.08 21 .12 .3 .7 BVL 1.3 96 SEP 28 1843 49.81 36 46.33 121 16.83 8.41 13 .07 .4 1.2 PAI 1.1 96 SEP 28 1934 47.54 37 31.88 118 26.29 9.83 35 2 .07 .4 .9 CHV 3.3 96 SEP 28 1936 28.63 37 31.70 118 26.05 9.67 14 1 .04 .3 .9 CHV 1.2 96 SEP 28 2248 36.93 36 26.37 120 59.83 0.64 11 .13 .9 1.5 BIT## 1.3 96 SEP 28 2313 49.54 39 15.17 123 12.44 5.24 7 .05 .5 2.4 MAA 1.3 96 SEP 28 2316 38.58 37 29.76 118 52.61 6.57 14 .08 .5 .6 MOR 1.4 96 SEP 29 127 26.27 36 16.81 120 27.30 10.11 18 .07 .3 .5 COA 1.9 96 SEP 29 127 50.97 36 16.73 120 27.30 9.74 17 .11 .3 .6 COA 1.8 96 SEP 29 249 26.35 40 24.97 122 3.88 4.72 7 2 .11 .7 7.0 SHA 1.3 96 SEP 29 715 20.32 38 48.46 122 48.02 1.74 9 .02 .3 .4 GEY 1.2 96 SEP 29 728 26.42 37 40.03 118 49.88 2.00 22 .11 .3 .4 HCF 1.7 96 SEP 29 811 20.38 38 42.31 119 37.82 0.16 11 .12 .6 2.7 WAK # 2.1 96 SEP 29 920 4.90 40 25.72 125 8.55 1.25 10 .27 7.514.5 MEN - 2.2 96 SEP 29 937 35.52 36 16.47 120 26.83 11.59 8 .06 .6 1.0 COA 1.2 96 SEP 29 1011 12.64 37 32.36 118 48.59 3.60 10 .05 .4 1.1 MOR 1.0 96 SEP 29 1013 8.65 38 48.16 122 48.36 4.84 19 .03 .2 .5 GEY 1.9 96 SEP 29 1139 22.32 38 47.30 122 45.40 1.82 7 .02 .3 .8 GEY 1.3 96 SEP 29 1158 52.81 36 52.29 121 36.42 6.39 75 2 .15 .2 .3 SJB 2.7 96 SEP 29 1354 8.72 36 27.05 120 12.18 17.65 38 1 .14 .5 .4 JQN 3.2 96 SEP 29 1525 45.07 38 47.21 122 45.38 2.29 7 .02 .3 .9 GEY 1.2 96 SEP 29 1615 23.96 40 5.85 123 44.47 20.04 23 2 .12 .4 .4 MEN 2.2 --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 96 SEP 29 1625 25.98 38 35.38 122 41.52 9.51 10 1 .06 .4 .9 NAP 1.2 96 SEP 29 1746 22.50 37 31.69 118 49.83 6.88 28 .07 .3 .5 MOR 2.1 96 SEP 29 1749 1.29 37 31.48 118 50.41 4.30 7 .04 1.6 2.8 MOR 1.1 96 SEP 29 1857 12.91 38 47.80 122 44.99 2.22 11 .03 .2 .7 GEY 1.8 96 SEP 29 1933 25.25 38 49.13 122 48.20 2.95 9 .03 .3 .7 GEY 1.2 96 SEP 29 2326 43.31 37 35.56 118 29.10 7.58 8 .04 .4 1.9 CHV 1.3 96 SEP 30 35 5.07 36 43.54 121 22.99 7.20 18 2 .06 .3 .6 STN 1.0 96 SEP 30 42 57.60 36 16.69 120 47.50 6.71 32 1 .18 .4 .7 BIT 2.0 96 SEP 30 255 25.46 37 8.62 122 11.16 10.58 18 4 .08 .3 .6 ANN 1.0 96 SEP 30 433 48.59 36 16.46 120 50.18 8.90 34 2 .10 .2 .4 BIT 1.8 96 SEP 30 447 35.78 37 7.78 121 34.82 3.30 56 .08 .1 .4 CYN 1.8 96 SEP 30 809 26.02 36 33.83 121 9.47 6.33 24 .06 .3 .7 PIN 1.9 96 SEP 30 912 4.41 38 20.64 122 36.47 9.84 45 1 .10 .2 .4 ROG 2.1 96 SEP 30 914 46.44 36 14.13 120 47.67 8.98 58 3 .17 .2 .5 BIT 2.8 96 SEP 30 927 17.41 38 44.78 122 41.93 2.75 42 .09 .2 .5 NAP 2.5 96 SEP 30 927 17.69 38 45.37 122 42.59 0.91 27 .19 .4 .8 GEY 2.6 96 SEP 30 1220 18.42 40 58.59 124 2.25 19.24 12 1 .05 .6 .4 EUR 2.0 96 SEP 30 1315 7.05 40 52.35 123 35.89 27.02 8 1 .02 .5 1.0 EUR 2.1 96 SEP 30 1625 56.93 36 38.48 121 15.71 6.64 17 .04 .3 .7 STN 1.0 96 SEP 30 1820 27.56 37 55.23 122 18.75 4.90 18 2 .15 .3 1.0 HAY 1.5 96 SEP 30 1951 29.60 39 28.80 121 59.46 15.09 11 1 .08 .7 1.4 SAC 2.1 96 SEP 30 2134 7.04 39 20.10 122 53.89 9.03 36 1 .08 .2 .8 BAR 2.2 96 SEP 30 2206 14.75 39 44.44 123 29.84 10.80 8 3 .28 1.2 2.2 MAA 1.2 96 SEP 30 2227 50.81 38 45.31 122 42.13 1.69 14 .06 .3 .4 NAP 1.4 96 SEP 30 2251 23.28 38 50.34 122 50.06 1.78 7 .05 .5 1.0 GEY 1.2 96 SEP 30 2326 44.42 38 49.15 122 47.99 3.52 7 .02 .4 .8 GEY 1.0 96 OCT 1 125 17.72 38 49.34 122 48.08 4.72 27 .06 .2 .4 GEY 2.1 96 OCT 1 139 0.96 38 52.79 122 49.20 2.33 7 .02 .3 1.0 GEY 1.1 96 OCT 1 211 29.26 37 31.68 118 49.77 7.20 29 .07 .3 .5 MOR 1.7 96 OCT 1 421 4.64 36 33.84 121 9.55 6.40 17 .03 .2 .6 PIN 1.0 96 OCT 1 617 5.72 38 48.06 122 48.13 0.78 13 .06 .3 .4 GEY 1.5 96 OCT 1 634 29.62 37 45.40 118 19.97 6.52 15 .15 .7 1.4 WHI 2.0 96 OCT 1 716 36.55 38 43.18 119 37.75 8.79 14 1 .11 .5 1.4 WAK 1.7 96 OCT 1 732 46.54 37 38.19 118 56.07 4.81 10 .03 .4 .6 SMO 1.1 96 OCT 1 825 10.39 37 32.70 118 49.45 0.04 9 2 .18 .8 .6 MOR # .8 96 OCT 1 1013 28.96 37 37.65 118 52.12 7.28 7 .05 1.2 .8 SMO 1.1 96 OCT 1 1058 49.25 37 31.36 118 53.66 14.23 13 3 .10 .6 .9 SIL 1.0 96 OCT 1 1126 2.25 39 44.71 123 30.90 11.05 8 1 .07 .6 1.0 MAA 1.2 96 OCT 1 1148 23.38 37 55.86 118 36.15 9.69 35 .09 .3 1.6 MOL 2.6 96 OCT 1 1157 5.41 37 48.91 122 11.97 3.79 24 1 .10 .2 .5 HAY 1.5 96 OCT 1 1357 52.16 37 21.37 121 42.95 8.95 13 1 .03 .3 .8 ALU 1.1 96 OCT 1 1403 38.60 40 23.55 125 47.70 5.14 30 .24 5.821.1 MEN - 3.0 96 OCT 1 1529 47.76 38 48.16 122 48.20 2.21 15 .03 .2 .4 GEY 1.8 96 OCT 1 1815 46.02 36 22.67 121 1.05 0.87 19 .08 .3 .7 BIT 2.2 96 OCT 1 1924 10.37 38 48.87 122 48.25 3.60 7 .03 .4 .8 GEY 1.3 --ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH N N RMS ERH ERZ DUR YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 96 OCT 1 2111 44.12 37 37.81 118 56.08 7.13 22 .08 .3 .5 SMO 1.5 96 OCT 1 2331 49.50 37 37.89 118 56.03 7.12 21 .08 .3 .5 SMO 1.5 96 OCT 1 2339 46.09 37 56.61 118 8.61 2.08 14 .10 1.1 8.6 NEV - 2.0 96 OCT 1 2345 49.00 37 37.73 118 55.85 6.77 10 .08 .5 .9 SMO 1.0 96 OCT 1 2347 38.58 37 37.00 119 0.20 5.07 16 .07 .4 .6 MAM 1.2 96 OCT 2 50 16.34 37 37.89 118 56.08 6.98 22 .09 .4 .5 SMO 1.4 96 OCT 2 57 9.31 37 33.99 118 50.16 7.05 15 .07 .4 .8 MOR 1.2 96 OCT 2 217 51.65 37 37.65 119 0.08 4.72 8 .03 .6 1.4 MAM 1.2 96 OCT 2 304 52.09 37 37.81 118 56.28 6.50 18 .10 .4 .6 SMO 1.4 96 OCT 2 308 48.74 38 54.19 122 33.84 7.16 21 .14 .5 1.2 BAR 2.1 96 OCT 2 503 38.30 37 3.05 121 12.43 6.23 22 .08 .4 .8 ORT 1.3 96 OCT 2 509 39.20 37 22.88 122 16.64 9.59 43 4 .15 .3 .6 BLM 2.0 96 OCT 2 636 10.83 38 44.84 119 42.20 6.48 7 2 .03 1.5 4.9 WAK 2.1 96 OCT 2 723 19.23 37 3.32 121 53.48 15.04 62 1 .06 .2 .3 LOM 1.8 96 OCT 2 901 56.75 39 31.42 120 22.82 12.12 8 2 .07 1.5 1.7 WAK 2.1 96 OCT 2 1009 58.99 36 28.12 121 2.55 5.65 25 .08 .3 .7 BIT 1.3 96 OCT 2 1032 16.35 38 50.51 122 48.76 1.91 7 .02 .4 .8 GEY 1.3 96 OCT 2 1137 14.67 38 47.07 122 27.69 7.31 38 1 .21 .3 .8 GVL 2.3 96 OCT 2 1151 43.89 38 50.53 122 47.08 1.33 7 .04 .3 .9 GEY 1.4 96 OCT 2 1152 14.46 38 46.59 122 26.88 7.19 26 .13 .3 .7 GVL 2.0 96 OCT 2 1152 40.28 37 33.47 118 51.10 8.02 23 .08 .3 .5 MOR 1.3 96 OCT 2 1201 12.39 40 26.39 124 43.49 24.40 14 .08 1.9 2.6 MEN 2.0 96 OCT 2 1216 9.46 38 46.77 122 27.55 6.34 12 .25 .7 1.5 GVL 1.4 96 OCT 2 1240 36.46 37 37.73 118 55.80 5.71 8 .08 .5 1.3 SMO 1.1 96 OCT 2 1403 21.90 38 41.20 119 36.76 7.88 9 .14 6.3 2.5 WAK 2.0 96 OCT 2 1432 51.71 36 41.54 121 24.05 16.11 41 .08 .2 .4 STN 1.8 96 OCT 2 1535 38.92 37 20.84 121 42.83 7.26 14 .07 .3 .9 ALU 1.2 96 OCT 2 1548 38.05 38 47.68 122 44.54 1.08 7 .06 .4 1.2 GEY 1.3 96 OCT 2 2158 28.98 38 46.11 122 42.28 1.26 7 .05 .7 .5 GEY 1.4 96 OCT 2 2349 37.27 38 48.19 122 48.00 2.69 11 .04 .3 .5 GEY 1.9 96 OCT 3 47 2.08 36 28.71 121 3.34 6.90 11 .05 .4 .9 BIT 1.2 96 OCT 3 205 46.69 37 30.26 118 49.09 4.19 14 .05 .5 .8 MOR 1.5 96 OCT 3 504 52.34 37 35.92 118 49.25 5.15 11 .04 .3 .5 MOR 1.7 96 OCT 3 512 29.96 36 49.13 121 32.52 5.99 43 .19 .3 .5 SJB 2.0 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 ------------------------------------------------------------------------ SEP 22 040811.7 42.711N 17.683E 10G 0.9 30 ADRIATIC SEA. ML 3.8 (LDG). 081237.8 32.157N 137.773E 389 3.9 0.9 28 SOUTH OF HONSHU, JAPAN 104324.8 9.579N 126.953E 33N 5.1 5.0 1.2 27 MINDANAO, PHILIPPINE ISLANDS 140526.8* 9.679N 126.868E 33N 5.0 4.9 1.5 23 MINDANAO, PHILIPPINE ISLANDS SEP 23 001626.9* 21.775N 121.405E 33N 4.3 0.8 13 TAIWAN REGION 002457.2 9.320N 126.654E 33N 4.8 1.1 36 MINDANAO, PHILIPPINE ISLANDS 003806.6* 9.289N 126.555E 33N 4.8 1.3 22 MINDANAO, PHILIPPINE ISLANDS 010637.9? 24.58 S 179.74 E 500G 4.5 0.8 16 SOUTH OF FIJI ISLANDS 023036.9? 9.24 N 126.64 E 33N 4.3 1.6 13 MINDANAO, PHILIPPINE ISLANDS 031958.9 12.556S 119.953E 33N 4.7 1.6 18 SOUTH OF SUMBA, INDONESIA 044159.9? 1.79 S 100.13 E 33N 4.7 1.5 14 SOUTHERN SUMATERA, INDONESIA 054551.3* 9.677N 126.459E 33N 4.4 1.3 15 MINDANAO, PHILIPPINE ISLANDS 064004.8 3.546S 151.694E 400G 4.8 0.9 80 NEW IRELAND REGION, P.N.G. 074004.4* 9.500N 126.525E 33N 4.6 0.9 11 MINDANAO, PHILIPPINE ISLANDS 093611.6 9.525N 126.531E 33N 5.0 0.8 31 MINDANAO, PHILIPPINE ISLANDS 103258.1* 0.114N 121.797E 186? 4.7 1.1 20 MINAHASSA PENINSULA, SULAWESI 110754.9* 1.015N 119.987E 33N 4.9 0.6 17 CELEBES SEA 123300.1* 9.539N 126.481E 33N 4.5 1.0 20 MINDANAO, PHILIPPINE ISLANDS 142947.0 2.089S 99.594E 33N 5.0 4.6 1.1 35 SOUTHERN SUMATERA, INDONESIA 143052.5 10.623N 126.232E 33N 4.9 0.8 19 PHILIPPINE ISLANDS REGION 145647.5 44.497N 148.240E 33N 4.8 0.7 39 KURIL ISLANDS 152356.6* 24.345N 123.260E 33N 4.4 0.8 8 SOUTHWESTERN RYUKYU ISLANDS 152916.5? 24.62 N 123.46 E 33N 4.5 1.3 9 SOUTHWESTERN RYUKYU ISLANDS 153215.2* 2.023S 99.636E 33N 4.2 0.7 13 SOUTHERN SUMATERA, INDONESIA 202358.4* 2.979N 126.837E 33N 4.4 1.1 20 NORTHERN MOLUCCA SEA 203416.6* 9.918N 126.386E 33N 4.9 1.0 19 MINDANAO, PHILIPPINE ISLANDS 204927.5* 17.489S 179.186W 600G 4.5 0.6 18 FIJI ISLANDS REGION 205031.9* 11.866S 117.313E 33N 4.2 1.5 7 SOUTH OF SUMBAWA, INDONESIA 205941.0* 50.570N 89.786E 33N 4.8 0.8 14 RUSSIA-MONGOLIA BORDER REGION 213046.3 2.999N 126.924E 33N 5.1 1.2 43 NORTHERN MOLUCCA SEA SEP 24 005429.2* 24.935N 123.468E 33N 4.9 1.1 10 SOUTHWESTERN RYUKYU ISLANDS 013027.3* 24.926N 123.496E 33N 4.5 1.0 18 SOUTHWESTERN RYUKYU ISLANDS 024520.3 43.949N 15.532E 10G 1.4 40 ADRIATIC SEA. ML 3.3 032801.9* 23.390N 88.589E 33N 5.7 1.6 16 INDIA-BANGLADESH BORDER REGION 042012.3? 9.63 N 126.46 E 33N 4.4 1.1 14 MINDANAO, PHILIPPINE ISLANDS 083428.7? 9.40 N 126.72 E 33N 4.4 0.6 9 MINDANAO, PHILIPPINE ISLANDS 114445.7* 9.512N 126.622E 33N 4.8 1.1 19 MINDANAO, PHILIPPINE ISLANDS 115247.6 9.284S 113.529E 45D 4.3 1.3 15 SOUTH OF JAWA, INDONESIA 124547.0& 47.718N 122.966W 48 34 WASHINGTON. . MD 3.5 130240.5* 17.821N 146.174E 150G 3.9 1.0 17 MARIANA ISLANDS 131649.1* 20.137S 176.434W 220D 4.8 0.9 35 FIJI ISLANDS REGION 132612.4% 33.684S 70.235W 110G 0.2 10 CHILE-ARGENTINA BORDER. MD 3.3 143222.6* 9.469N 126.491E 33N 4.8 1.1 27 MINDANAO, PHILIPPINE ISLANDS 175132.3 35.451N 141.239E 33N 4.5 0.8 16 NEAR EAST COAST OF HONSHU, JAPAN 192449.4 27.211N 100.409E 33N 5.3 5.2 0.8 123 YUNNAN, CHINA. Some damage in the epicentral area. 210246.5* 27.225N 100.239E 10G 4.2 1.5 16 YUNNAN, CHINA 214314.7* 48.249N 153.096E 33N 5.0 0.7 83 KURIL ISLANDS 225152.7? 32.17 S 71.15 W 40G 0.2 10 NEAR COAST-CENTRAL CHILE. MD 3.7 235310.9 47.073N 10.358E 5G 1.2 13 AUSTRIA. ML 2.4 (LDG), 2.4 (VIE). Felt (IV) at Lech and Vorarlberg. SEP 25 003500.3? 35.26 S 71.36 W 100G 0.3 10 CENTRAL CHILE. MD 3.8 (SAN). 010524.3? 35.93 S 71.50 W 150G 0.3 10 CENTRAL CHILE. MD 3.0 (SAN). 020115.4 51.623N 16.149E 10G 0.7 11 POLAND. ML 3.1 (MOX). 024129.3 27.232N 100.396E 33N 4.5 1.0 24 YUNNAN, CHINA 025630.8* 4.520N 126.949E 33N 4.6 0.9 14 TALAUD ISLANDS, INDONESIA 041157.3 51.540N 16.255E 10G 0.6 15 POLAND. ML 3.6 (GRF). 060843.9* 2.147S 99.655E 33N 4.8 1.0 18 SOUTHERN SUMATERA, INDONESIA 072021.1* 9.436N 126.482E 33N 5.2 1.2 29 MINDANAO, PHILIPPINE ISLANDS 073916.8* 21.485N 122.590E 33N 4.2 1.2 10 TAIWAN REGION 074130.1* 9.413N 126.698E 33N 4.7 0.7 14 MINDANAO, PHILIPPINE ISLANDS 092645.4 9.785N 126.340E 33N 5.5 5.6 1.0 56 MINDANAO, PHILIPPINE ISLANDS 093556.8* 3.381S 131.068E 33N 4.8 1.1 19 IRIAN JAYA REGION, INDONESIA 094457.7* 48.986N 156.052E 33N 4.1 1.1 14 EAST OF KURIL ISLANDS 100246.3* 9.672N 126.551E 33N 4.7 1.0 14 MINDANAO, PHILIPPINE ISLANDS 101826.1* 48.988N 156.458E 33N 4.1 1.3 10 EAST OF KURIL ISLANDS 103514.5* 39.022S 174.919E 200G 5.0 1.5 30 NORTH ISLAND, NEW ZEALAND 113631.9 13.770N 120.881E 100G 5.0 1.0 46 MINDORO, PHILIPPINE ISLANDS 114331.5* 9.707N 126.725E 33N 5.1 1.5 27 MINDANAO, PHILIPPINE ISLANDS 114656.3* 6.862S 129.491E 149? 4.9 1.6 19 BANDA SEA 114828.6? 9.64 N 126.29 E 33N 4.8 0.6 10 MINDANAO, PHILIPPINE ISLANDS 123926.7? 16.05 S 176.57 W 400G 4.3 0.9 21 FIJI ISLANDS REGION 124153.4* 28.853N 99.186E 33N 5.0 1.3 15 YUNNAN, CHINA 124808.0* 13.331S 166.628E 33N 4.6 1.1 19 VANUATU ISLANDS 134549.5* 17.475S 179.182W 600G 4.8 0.5 22 FIJI ISLANDS REGION 135608.7 23.433N 143.707E 33N 4.8 1.4 64 VOLCANO ISLANDS REGION 141210.1* 1.277N 123.258E 33N 4.5 1.2 11 MINAHASSA PENINSULA, SULAWESI 145641.5* 9.755N 126.274E 33N 4.9 0.9 14 MINDANAO, PHILIPPINE ISLANDS 145950.3* 65.678S 44.461E 10G 4.6 0.8 11 SOUTH INDIAN OCEAN 155451.8* 12.455N 126.164E 33N 5.0 1.3 18 PHILIPPINE ISLANDS REGION 162216.1* 27.981N 51.333E 10G 3.6 0.8 21 PERSIAN GULF 173033.2* 3.914S 79.073W 100D 4.9 0.9 35 NEAR COAST OF ECUADOR. Felt in the Loja region. 174116.9 27.449N 88.628E 33N 4.9 4.6 1.1 33 SIKKIM, INDIA 174953.2* 21.826N 144.697E 33N 4.4 1.0 10 MARIANA ISLANDS REGION 175630.8 46.218N 14.399E 10G 0.9 13 NORTHWESTERN BALKAN REGION. ML 3.8 181904.0* 9.468N 126.486E 33N 5.0 1.2 26 MINDANAO, PHILIPPINE ISLANDS 184907.1? 23.76 S 179.93 E 500G 4.5 1.2 21 SOUTH OF FIJI ISLANDS 190741.8* 39.098N 71.379E 82? 4.2 0.7 11 TAJIKISTAN 203537.0? 13.74 N 144.66 E 136 4.3 0.9 13 MARIANA ISLANDS 211433.0* 13.028N 143.375E 222* 4.4 0.6 15 SOUTH OF MARIANA ISLANDS 211609.2 9.268S 108.704E 33N 5.2 5.6 1.5 70 SOUTH OF JAWA, INDONESIA. Mw 5.7 SEP 26 013007.2 30.110N 42.170W 10G 4.8 1.0 34 NORTHERN MID-ATLANTIC RIDGE 034528.5 9.523N 126.531E 33N 5.2 5.4 1.0 39 MINDANAO, PHILIPPINE ISLANDS 050003.3* 9.737N 126.751E 33N 4.6 1.1 28 MINDANAO, PHILIPPINE ISLANDS 052318.2* 9.688N 126.777E 33N 4.7 0.7 18 MINDANAO, PHILIPPINE ISLANDS 055900.7? 10.09 N 125.99 E 33N 4.8 0.9 17 LEYTE, PHILIPPINE ISLANDS 061159.1* 11.427N 87.188W 33N 4.6 0.8 18 NEAR COAST OF NICARAGUA 071732.5? 52.65 N 171.79 W 33N 4.8 0.9 20 FOX ISLANDS, ALEUTIAN ISLANDS 081345.8* 53.934N 159.903E 33N 4.9 1.0 38 NEAR EAST COAST OF KAMCHATKA 094558.8* 4.841S 151.211E 100G 4.3 1.1 16 NEW BRITAIN REGION, P.N.G. 152908.3* 6.191S 146.055E 33N 5.1 1.5 31 EASTERN NEW GUINEA REG., P.N.G. 163818.4? 32.46 S 70.39 W 100G 0.3 9 CHILE-ARGENTINA BORDER. MD 3.2 171720.1 23.981N 125.211E 33N 4.5 1.0 16 SOUTHWESTERN RYUKYU ISLANDS 183515.1? 48.58 S 16.74 W 10G 4.7 0.8 5 SOUTHERN MID-ATLANTIC RIDGE 184618.1* 33.540S 71.803W 40G 0.5 8 NEAR COAST-CENTRAL CHILE. MD 3.1 SEP 27 090855.1* 12.219S 71.972W 33N 4.7 1.1 18 CENTRAL PERU 134439.3 40.429N 127.352W 10G 0.9 64 OFFSHORE NORTHERN CALIFORNIA. ML 4.0 225000.9* 5.868S 148.146E 170? 5.4 0.7 18 NEW BRITAIN REGION, P.N.G. SEP 28 073627.7 19.493N 103.244W 102D 4.7 0.8 34 JALISCO, MEXICO 075446.9? 23.95 N 143.79 E 33N 5.0 0.5 32 VOLCANO ISLANDS REGION 085304.0* 20.011S 68.697W 119D 4.4 0.9 16 CHILE-BOLIVIA BORDER 110245.4 35.012N 23.743E 10G 4.9 0.7 26 CRETE. Felt in the western part of Crete. 110257.0? 56.13 N 163.45 E 33N 5.3 0.9 30 NEAR EAST COAST OF KAMCHATKA 121759.1* 11.475N 86.789W 33N 5.4 5.0 1.3 66 NEAR COAST OF NICARAGUA 141042.2 10.080N 125.409E 234 5.7 0.8 66 LEYTE, PHILIPPINE ISLANDS. 151431.4? 15.80 S 175.51 W 266D 4.8 0.6 35 TONGA ISLANDS 170705.4* 51.634N 161.626E 33N 5.3 0.8 56 OFF EAST COAST OF KAMCHATKA 182411.7 18.067S 69.861W 55D 5.0 0.8 41 NORTHERN CHILE 193447.9 37.579N 118.421W 5G 0.9 30 CALIFORNIA-NEVADA BORDER. ML 3.2 202432.3 34.283N 118.564W 10G 1.2 30 SOUTHERN CALIFORNIA. ML 2.8 SEP 29 014557.0? 11.11 N 87.42 W 33N 4.5 1.1 12 NEAR COAST OF NICARAGUA 055237.6* 51.500N 175.273W 33N 4.8 1.2 40 ANDREANOF ISLANDS, ALEUTIAN IS. 061524.0? 10.73 S 165.55 E 33N 5.4 0.4 48 SANTA CRUZ ISLANDS 104818.2 64.645N 17.445W 10G 5.2 5.4 0.9 55 ICELAND 122138.5 20.335N 145.424E 33N 4.9 0.3 18 MARIANA ISLANDS 135408.3 36.459N 120.154W 15G 0.7 34 CENTRAL CALIFORNIA. ML 3.0 (GS). 230700.0& 48.030N 122.700W 56 10 WASHINGTON. . MD 3.6 SEP 30 054951.2 54.204N 160.242E 97D 5.4 0.7 85 NEAR EAST COAST OF KAMCHATKA 184216.0* 22.317S 68.350W 125D 4.9 1.0 24 NORTHERN CHILE 185203.5? 45.67 N 151.70 E 33N 5.2 5.1 0.7 52 KURIL ISLANDS OCT 01 005253.4 52.346N 166.704W 33N 5.7 4.5 0.9 77 FOX ISLANDS, ALEUTIAN ISLANDS. 155023.7? 12.52 N 58.01 E 10G 5.7 5.9 0.9 49 ARABIAN SEA. Mw 6.3 190903.3 26.472N 110.860W 10G 5.0 1.0 56 GULF OF CALIFORNIA 220930.5* 44.393N 128.506W 10G 4.5 1.0 22 OFF COAST OF OREGON 230412.8 12.602S 76.767W 62D 5.4 0.8 79 NEAR COAST OF PERU OCT 02 094801 Q 11.7 N 125.6 E 33N 6.4 0.7 61 SAMAR, PHILIPPINE ISLANDS 112447 Q 44.8 N 151.1 E 33N 5.9 0.6 134 EAST OF KURIL 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.