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 May 9 - 15, 1996 Stephen R. Walter U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 San Francisco Bay Area Activity was up slightly during the week, mostly in the South Bay area. During the seven-day period ending at midnight on Wednesday, May 15, 1996 the U.S. Geological Survey office in Menlo Park recorded 31 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Eight were as large as M2. This total compares to 21 earthquakes during the previous seven-day period (May 2 - 8), only two of which were as large as M2.0. A pair of M2 events occurred on the creeping San Andreas early in the week, both locating about 2-3 miles south of San Juan Bautista (#1/1). A second pair followed on Sunday morning on the Sargent fault about eight miles northeast of Watsonville (#2/1). The Quien Sabe fault east of Hollister also produced a pair of M2 earthquakes: a M2.1 early Tuesday morning (#3/1) and a M2.2 later that evening (#5/1). The only notable activity in the central Bay area was a pair of M2's on the northern Hayward fault. The first of these was a M2.1 on Tuesday morning that occurred beneath El Cerrito (#4/1). Later that night a M2.0 occurred on the Hayward fault in eastern Oakland (#6/1). Northern & Central California The week was fairly quiet in the rest of the region with no earthquakes as large as M3. As usual, the most activity occurred in the Cape Mendocino area where the Mendocino fracture zone/Gorda Plate system produced nine M2 earthquakes. Four occurred in a small cluster just 12 miles west of Petrolia (#1/2). Another small cluster occurred farther out along the fracture zone (#4/2). The Gorda Plate produced one M2.5 near the base of the continental slope (#7/2) and one 40-km-deep subduction earthquake whose epicenter was located about 50 miles northwest of Weaverville (#8/2). Earthquakes in the Coast Ranges included a pair of M2.5 events northeast of Willits (#6/2), a M2.5 southeast of Clear Lake (#9/2), and the usual handful of M2's at the Geysers geothermal area. The Sierra Nevada remained quiet, Long Valley area excepted, with just three events as large as M2: a M2.0 southwest of Chester (#5/2), a M2.5 beneath Lake Tahoe (#2/2), and a 22-km-deep event northeast of Fresno (#3/2). Central California was very quiet with just one M2 earthquake along the creeping San Andreas (a M2.2 about 15 miles east of Pinnacles National Monument) and a M2.0 southeast of the Coalinga area. Long Valley Caldera M2 activity resumed along the southern rim of the caldera, south of the airport, with three events as large as M2, all within a 10-minute period on Wednesday afternoon (#5/3). The only other M2 earthquake within the caldera was a M2.2 early Sunday morning beneath the resurgent dome (#2/3). The Sierra Nevada range south of the caldera produced a small cluster of M2 events south of Red Slate Mountain (#3/3), a pair of M2's just west of Mt. Morrison (#1/3), and a M2.0 on the Round Valley fault 15 miles northwest of Bishop (#4/3). USA Seismicity (May 5 - 16) The largest earthquake of the week occurred Thursday morning near the Idaho-Wyoming border about 20 miles southwest of Afton, WY (#3/4). The earthquake was felt in Afton and in parts of southeastern Idaho, though no damage was reported. The earthquake is in the same areas as a M5.8 on February 3, 1994 that caused some damage in the Afton-Auburn area of Wyoming. Aftershocks continued to last week's M5.5 earthquake east of Seattle (#1/4). Most were in the M2.5 range including several that were reported to have been felt locally. Another quite small earthquake along California-Mexico border was also felt locally (#2/4). The Planet Earth (May 5 - 15) The planet was fairly quiet during the week with only one earthquake as large as M6. A Ms6.4 in the Solomon Islands area was an aftershock to a Ms7.5 on April 29 (#4/5). In southern Peru, a Mb5.4 was felt in the coastal mountains west of Cuzco (#1/5). A Mb5.3 north of the Virgin Islands was felt at San Juan, Puerto Rico (#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 96 MAY 9 746 9.09 37 39.74 118 51.19 7.38 9 .06 .7 1.4 DOM 1.4 96 MAY 9 802 50.52 37 32.92 118 49.64 1.17 11 .07 1.2 .8 MOR 1.1 96 MAY 9 811 42.59 38 47.71 122 44.80 1.27 7 .05 .3 .8 GEY 1.4 96 MAY 9 918 59.94 40 27.98 121 33.17 4.63 7 1 .03 .6 .5 LAS 2.0 96 MAY 9 921 1.42 36 28.71 121 3.10 5.61 20 .05 .3 .6 BIT 1.2 96 MAY 9 953 38.17 35 53.15 119 43.07 22.53 19 .21 .8 1.3 BAK 2.1 96 MAY 9 1037 44.05 40 43.73 121 31.02 5.07 7 3 .05 1.3 6.7 SHA - 1.8 96 MAY 9 1040 33.39 37 29.56 118 50.57 8.71 24 .07 .4 1.2 MOR 1.9 96 MAY 9 1102 47.15 37 35.42 118 49.18 3.84 18 .07 .4 .4 MOR 1.8 96 MAY 9 1300 24.66 38 50.28 122 48.58 1.41 13 .05 .3 .7 GEY 1.6 96 MAY 9 1347 41.37 36 48.41 121 31.98 6.42 59 .18 .3 .5 SJB 2.0 96 MAY 9 1351 16.61 40 23.72 124 31.26 13.49 17 .09 1.2 .3 MEN 2.5 96 MAY 9 1403 57.67 39 3.66 120 0.46 0.08 30 2 .12 .3 1.2 WAK * 2.6 96 MAY 9 1416 55.67 38 47.97 122 49.46 1.81 18 .07 .2 .6 GEY 1.7 96 MAY 9 1501 1.92 39 34.39 123 20.76 9.00 15 .07 .3 .8 MAA 1.7 96 MAY 9 1613 43.36 38 49.06 122 48.12 4.00 7 .01 .4 .8 GEY 1.0 96 MAY 9 1613 48.96 38 49.05 122 48.21 4.14 9 .03 .4 .6 GEY .9 96 MAY 9 1617 16.77 38 47.03 122 45.63 2.52 18 .05 .2 .6 GEY 1.8 96 MAY 9 1715 49.14 38 47.07 122 45.40 1.57 11 .05 .2 .6 GEY 1.6 96 MAY 9 1720 0.38 35 59.98 120 33.53 3.97 8 .05 .5 1.6 SLA 1.2 96 MAY 9 1723 58.49 38 51.30 122 48.99 1.33 11 .04 .3 .8 GEY 1.4 96 MAY 9 1736 21.91 38 49.19 122 48.51 3.77 22 .04 .2 .4 GEY 2.4 96 MAY 9 2000 18.46 37 33.63 118 51.91 3.74 12 .05 1.0 1.6 MOR 1.3 96 MAY 9 2012 58.51 38 49.45 122 48.42 3.92 13 .06 .3 .8 GEY 1.4 96 MAY 9 2103 57.73 38 49.41 122 48.41 4.86 22 .07 .3 .5 GEY 2.0 96 MAY 9 2157 16.10 37 33.00 118 25.69 6.56 11 .08 .5 .6 CHV 1.6 96 MAY 9 2213 5.06 39 28.56 123 0.09 6.08 14 .06 .3 .9 BAR 1.8 96 MAY 9 2217 42.67 40 43.89 121 30.39 8.62 9 2 .04 .8 5.8 SHA 2.0 96 MAY 9 2358 14.93 36 24.17 120 55.65 6.03 43 .10 .3 .8 BIT 2.3 96 MAY 10 38 10.35 38 47.60 122 46.29 3.96 9 .02 .3 .8 GEY 1.2 96 MAY 10 50 22.72 38 54.51 122 30.07 4.61 8 1 .05 .4 4.2 BAR 1.7 96 MAY 10 115 4.39 37 35.27 118 51.69 8.57 20 .07 .4 .5 MOR 1.4 96 MAY 10 139 20.68 38 49.36 122 48.35 5.35 10 .10 .5 .9 GEY 1.4 96 MAY 10 407 8.38 37 33.68 118 51.80 4.00 9 .05 1.3 1.9 MOR 1.2 96 MAY 10 523 3.73 40 24.96 123 40.39 22.11 10 .05 .4 .5 MEN 1.7 96 MAY 10 646 40.27 37 37.42 118 51.31 6.11 24 .09 .3 .4 SMO 2.0 96 MAY 10 754 27.58 36 55.79 119 16.31 21.97 30 3 .10 .4 .9 KAI 2.4 96 MAY 10 820 31.21 40 23.78 125 11.19 12.54 18 .34 9.829.3 MEN - 2.7 96 MAY 10 912 52.73 37 29.32 121 49.79 9.24 7 1 .05 .5 .9 MIS 1.0 96 MAY 10 921 31.98 37 30.20 118 51.86 6.69 16 .08 .6 1.5 MOR 1.4 96 MAY 10 942 55.93 40 18.88 124 27.93 9.35 10 .06 1.5 .4 MEN 2.1 96 MAY 10 1053 49.49 38 48.70 122 47.96 2.37 12 .02 .3 .4 GEY 1.4 96 MAY 10 1109 54.13 38 47.77 122 48.55 4.11 7 .01 .3 .9 GEY 1.0 96 MAY 10 1233 21.65 38 47.72 122 44.84 2.86 14 .04 .2 .7 GEY 1.5 96 MAY 10 1250 30.52 36 42.62 121 21.26 3.05 9 .04 .3 .5 STN .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 96 MAY 10 1514 59.82 36 40.83 121 18.46 2.90 15 .08 .3 .7 STN 1.5 96 MAY 10 1518 43.06 36 40.89 121 18.38 2.81 11 .06 .4 .6 STN 1.0 96 MAY 10 1536 57.13 38 46.43 122 44.02 1.07 7 .04 .4 .8 GEY 1.3 96 MAY 10 1550 39.91 36 3.43 120 36.09 6.63 27 .07 .3 .3 SLA 1.8 96 MAY 10 1554 55.53 36 3.36 120 35.98 6.91 13 1 .07 .8 .5 SLA 1.5 96 MAY 10 1717 22.52 38 47.78 122 43.77 0.42 7 .06 .4 1.4 GEY 1.3 96 MAY 10 2127 33.88 38 46.97 122 43.36 2.41 8 .05 .4 .9 GEY 1.3 96 MAY 10 2220 21.86 38 47.46 122 48.08 4.26 10 .01 .3 .7 GEY 1.2 96 MAY 10 2243 53.92 37 18.13 121 40.56 6.30 59 2 .06 .1 .3 SFL 1.9 96 MAY 10 2301 28.58 37 36.45 118 50.41 2.55 13 .06 .3 .5 SMO 1.5 96 MAY 10 2303 25.64 37 36.67 118 50.25 2.88 18 .09 .3 .6 SMO 1.8 96 MAY 10 2320 35.54 40 43.74 121 30.57 11.18 8 3 .04 1.1 5.4 SHA 1.9 96 MAY 11 37 52.49 40 28.70 124 39.02 24.61 18 .10 1.2 1.4 MEN 2.3 96 MAY 11 40 21.00 37 33.79 118 52.26 3.84 31 1 .07 .2 .5 MOR 2.4 96 MAY 11 41 59.54 37 34.07 118 51.96 4.73 13 .07 .5 1.4 MOR 1.1 96 MAY 11 55 28.45 38 50.19 122 49.90 0.80 7 .04 .3 1.5 GEY 1.0 96 MAY 11 56 6.53 37 34.17 118 52.07 4.12 22 .07 .3 .6 MOR 1.7 96 MAY 11 240 12.73 37 34.18 118 52.15 3.57 15 .07 .3 .9 MOR 1.4 96 MAY 11 508 35.27 36 52.48 121 36.24 5.56 28 .10 .3 .4 SJB 1.3 96 MAY 11 528 41.68 38 50.51 122 49.27 2.38 7 .05 .4 .9 GEY 1.2 96 MAY 11 647 16.37 37 20.55 118 45.58 7.08 17 .33 2.822.9 KAI - 1.9 96 MAY 11 650 50.22 37 34.21 118 52.10 3.91 22 .08 .3 .6 MOR 1.9 96 MAY 11 846 2.99 39 1.37 123 4.23 1.02 18 .07 .2 1.0 MAA 1.8 96 MAY 11 847 42.25 40 9.28 121 25.97 6.52 22 2 .12 .6 .7 ALM 2.1 96 MAY 11 858 11.52 38 46.95 122 45.77 2.51 12 .04 .3 .8 GEY 1.4 96 MAY 11 936 50.75 38 48.81 122 48.66 4.22 8 .03 .4 .8 GEY 1.3 96 MAY 11 1031 6.86 38 50.52 122 49.28 2.12 7 .04 .4 .8 GEY 1.0 96 MAY 11 1148 0.42 37 59.18 122 4.15 17.75 24 1 .19 .6 1.0 CON 1.6 96 MAY 11 1221 23.78 37 34.28 118 52.14 4.37 20 .09 .3 .6 MOR 1.7 96 MAY 11 1238 33.16 37 34.27 118 52.20 3.71 15 .07 .3 .8 MOR 1.4 96 MAY 11 1308 30.42 37 34.16 118 51.98 4.36 13 .07 .5 1.3 MOR 1.4 96 MAY 11 1348 50.71 37 34.26 118 52.09 3.88 16 .07 .4 .7 MOR 1.4 96 MAY 11 1603 59.48 37 29.61 118 51.95 7.77 20 1 .10 .5 .6 MOR 1.4 96 MAY 11 1652 41.27 37 33.95 118 52.05 4.04 18 .10 .4 .9 MOR 1.4 96 MAY 11 1721 2.07 37 33.88 118 51.53 5.28 15 .06 .6 .9 MOR 1.3 96 MAY 11 1739 51.52 37 34.17 118 52.40 3.80 28 .08 .2 .5 MOR 2.4 96 MAY 11 1752 17.37 36 0.17 120 33.54 3.48 17 2 .05 .3 .6 SLA 1.8 96 MAY 11 1814 16.42 37 21.98 121 43.67 8.75 28 2 .06 .2 .5 ALU 1.5 96 MAY 11 1938 36.14 38 48.33 122 45.23 1.12 8 .06 .3 .9 GEY 1.0 96 MAY 11 1938 42.53 38 48.63 122 45.23 0.04 11 .13 .3 1.2 GEY * .9 96 MAY 11 1954 7.85 37 34.32 118 51.66 5.38 14 .08 .4 1.0 MOR 1.3 96 MAY 11 2141 48.33 39 48.03 122 51.26 10.05 29 4 .19 .3 1.2 SAC 2.3 96 MAY 11 2241 20.72 38 24.38 118 19.91 4.33 35 .10 1.0 2.4 NEV 2.8 96 MAY 11 2308 16.28 38 46.96 122 45.70 2.53 9 1 .04 .3 .8 GEY 1.2 96 MAY 11 2317 12.43 40 11.13 121 5.11 4.25 9 1 .16 1.4 7.4 ALM 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 96 MAY 11 2318 5.41 36 34.90 121 11.14 7.30 24 1 .06 .2 .5 PIN 1.5 96 MAY 12 323 49.50 38 47.15 122 45.36 1.84 17 .05 .2 .5 GEY 1.9 96 MAY 12 456 2.60 36 58.12 121 41.06 4.33 23 .08 .2 .7 SAR 1.0 96 MAY 12 634 52.25 40 21.02 124 23.68 19.30 7 .06 3.2 1.9 MEN 1.7 96 MAY 12 839 44.11 37 6.36 121 45.49 2.79 10 .07 .3 2.6 SCV 1.1 96 MAY 12 904 29.99 38 50.78 122 48.58 1.49 8 .03 .4 .9 GEY 1.4 96 MAY 12 1048 40.73 36 49.78 121 33.85 7.78 80 3 .18 .2 .4 SJB 2.4 96 MAY 12 1056 23.95 37 39.33 118 54.07 1.57 21 .10 .3 .4 DOM 2.4 96 MAY 12 1059 52.15 40 29.41 122 6.85 22.22 14 4 .11 .4 1.2 SHA 1.9 96 MAY 12 1210 38.99 37 39.29 118 54.03 1.47 16 .09 .3 .3 DOM 2.2 96 MAY 12 1238 13.18 36 8.55 120 11.21 6.99 8 .11 .6 1.6 COA 1.3 96 MAY 12 1354 37.96 38 47.68 122 47.43 0.02 7 .04 .3 .9 GEY * 1.3 96 MAY 12 1432 12.64 37 35.78 118 47.45 6.95 15 1 .11 .4 .6 MOR 1.1 96 MAY 12 1706 46.75 40 47.29 125 10.75 6.05 19 .10 2.411.7 DEL - 2.4 96 MAY 12 1836 34.35 40 19.26 125 8.37 7.44 11 .2715.6 9.4 MEN - 2.5 96 MAY 12 1841 39.78 36 58.56 121 37.42 4.34 76 1 .18 .2 .5 SAR 2.1 96 MAY 12 1856 34.98 36 58.34 121 37.31 4.66 79 .15 .2 .4 SAR 2.7 96 MAY 12 1857 27.39 36 58.38 121 37.59 4.15 37 .19 .3 .7 SAR 1.8 96 MAY 12 1925 49.30 37 35.79 118 55.12 5.06 20 .08 .3 .4 SIL 1.9 96 MAY 12 2003 8.20 37 36.05 118 54.97 5.83 13 .08 .4 .7 SHE 1.1 96 MAY 12 2036 35.46 38 48.31 122 48.75 4.07 8 .01 .4 .7 GEY 1.3 96 MAY 12 2309 20.83 37 6.46 121 7.21 2.51 8 .14 1.712.7 ORT - 1.4 96 MAY 13 45 7.43 37 32.90 118 26.11 7.51 11 .08 .4 .7 CHV 1.5 96 MAY 13 49 29.42 37 32.59 118 48.90 0.56 11 .07 .3 .4 MOR 1.6 96 MAY 13 226 37.65 37 28.58 118 52.49 5.27 27 .08 .3 1.3 MOR 2.3 96 MAY 13 238 55.42 37 28.59 118 52.70 7.12 19 .09 .3 .7 MOR 1.7 96 MAY 13 239 27.23 37 29.40 118 51.98 6.92 8 .06 .7 .6 MOR 1.0 96 MAY 13 321 45.96 37 9.51 121 32.93 5.94 7 .02 .8 1.5 CYN 1.0 96 MAY 13 322 10.42 37 9.69 121 33.11 6.02 7 .02 .7 1.3 CYN 1.1 96 MAY 13 353 3.52 37 28.64 118 52.89 7.30 12 .07 .4 .8 MOR 1.1 96 MAY 13 835 17.33 36 45.41 121 17.63 5.26 14 .02 .3 .6 PAI 1.0 96 MAY 13 854 44.85 37 30.68 121 41.25 6.33 39 3 .05 .2 .4 HAM 1.5 96 MAY 13 912 34.00 37 36.88 118 51.78 5.41 11 .06 .4 .7 SMO 1.4 96 MAY 13 941 31.95 38 17.34 122 23.45 8.09 9 .03 .3 1.5 NAP 1.2 96 MAY 13 1151 1.26 37 28.56 118 52.39 7.16 17 .07 .3 .7 MOR 1.4 96 MAY 13 1248 44.31 38 47.63 122 48.47 4.50 12 .03 .3 .5 GEY 1.6 96 MAY 13 1422 15.99 41 21.69 123 19.34 39.97 17 1 .15 .5 .5 KLA 3.0 96 MAY 13 1432 41.15 37 39.79 118 49.78 2.48 9 .14 .8 .8 HCF 1.1 96 MAY 13 1457 0.22 37 35.75 118 51.63 8.58 13 .04 .4 .6 MOR 1.2 96 MAY 13 1516 49.99 38 49.71 122 50.60 0.04 9 .34 1.1 3.3 GEY * 1.0 96 MAY 13 1748 9.13 36 35.22 121 11.23 2.34 14 .04 .3 .4 PIN 1.4 96 MAY 13 1800 29.55 37 28.23 118 32.58 14.28 22 .07 .3 1.1 CHA 1.5 96 MAY 13 1855 46.47 38 48.68 122 50.07 2.07 8 .04 .3 .7 GEY 1.2 96 MAY 13 1856 51.64 38 48.63 122 50.15 1.71 8 .09 .5 .9 GEY 1.1 96 MAY 13 1957 17.72 39 34.44 123 4.54 5.03 27 1 .07 .2 1.2 BAR 2.5 --ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH N N RMS ERH ERZ DUR YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 96 MAY 13 2020 55.03 40 24.26 124 11.24 30.77 11 2 .07 .6 1.2 MEN 1.8 96 MAY 13 2242 23.14 40 16.85 124 23.64 24.17 21 1 .08 1.0 .4 MEN 2.9 96 MAY 14 100 46.68 37 28.61 118 37.81 10.60 29 1 .09 .3 .8 RVL 2.2 96 MAY 14 607 19.38 37 25.45 118 28.42 8.42 17 .21 2.3 3.7 CHA 1.4 96 MAY 14 821 23.71 38 47.03 122 45.72 2.02 14 .02 .2 .5 GEY 1.6 96 MAY 14 926 19.10 37 38.32 118 56.60 8.55 23 .08 .3 .5 SMO 1.7 96 MAY 14 949 42.80 37 16.71 118 2.00 20.21 9 .07 7.8 1.8 DEV - 2.1 96 MAY 14 1034 10.24 37 34.19 118 51.66 5.03 15 .07 .5 .7 MOR 1.2 96 MAY 14 1155 56.84 38 48.12 122 48.24 1.45 16 .04 .2 .3 GEY 1.7 96 MAY 14 1233 26.46 37 37.59 118 52.52 6.17 9 .05 .7 1.0 SMO 1.0 96 MAY 14 1253 48.07 37 35.62 118 27.96 8.49 16 .05 .3 .7 CHV 1.5 96 MAY 14 1323 18.28 36 48.88 121 12.15 7.21 58 2 .07 .2 .5 PAN 2.2 96 MAY 14 1419 55.28 38 47.56 122 46.66 4.12 12 .02 .3 .6 GEY 1.6 96 MAY 14 1530 40.39 38 47.55 122 46.54 4.19 9 .02 .3 .8 GEY 1.1 96 MAY 14 1539 13.39 37 44.06 121 55.01 7.44 9 .04 .4 1.1 DAN 1.1 96 MAY 14 1540 51.56 38 48.77 122 48.56 4.91 28 .05 .2 .4 GEY 2.2 96 MAY 14 1541 35.54 38 48.78 122 48.53 4.91 25 .06 .2 .4 GEY 2.0 96 MAY 14 1547 48.50 37 34.53 118 51.44 8.40 25 .07 .3 .5 MOR 1.7 96 MAY 14 1559 35.60 40 10.04 124 59.71 0.03 8 .26 8.514.0 MEN - 2.9 96 MAY 14 1612 28.83 38 31.69 122 39.51 6.93 8 .04 .4 .9 NAP 1.5 96 MAY 14 1657 30.57 36 18.33 120 41.38 9.64 9 .06 .4 .6 CRV 1.6 96 MAY 14 1737 30.88 37 34.41 118 50.76 10.23 8 .05 1.7 2.7 MOR .9 96 MAY 14 1751 7.95 37 54.67 122 17.31 5.91 75 6 .18 .2 .4 HAY 2.1 96 MAY 14 2110 39.04 37 9.98 122 0.02 11.71 15 .07 .3 .9 LOM 1.2 96 MAY 14 2130 47.06 36 32.60 121 7.93 6.48 11 .03 .3 .9 PIN 1.2 96 MAY 14 2218 10.42 37 52.07 121 48.01 4.90 20 3 .08 .3 .4 GRN 1.6 96 MAY 14 2235 30.04 36 36.74 121 4.94 8.68 16 .10 .6 1.2 BVL 1.3 96 MAY 14 2310 40.19 36 38.71 121 16.02 6.97 18 .05 .3 .8 STN 1.5 96 MAY 14 2348 43.36 38 47.35 122 45.53 1.04 15 .04 .2 .6 GEY 1.9 96 MAY 15 8 15.54 37 34.33 121 40.03 6.84 17 3 .06 .3 .8 HAM 1.4 96 MAY 15 230 13.01 36 50.28 121 17.99 6.27 55 1 .06 .2 .3 QUI 2.3 96 MAY 15 341 55.74 36 53.01 121 37.01 7.46 27 .09 .3 .4 SJB 1.2 96 MAY 15 346 21.46 36 53.05 121 37.00 7.23 37 .10 .2 .4 SJB 1.6 96 MAY 15 411 36.92 37 48.02 122 12.10 10.48 68 3 .14 .2 .5 HAY 2.0 96 MAY 15 417 41.26 38 47.86 122 46.87 4.26 9 .02 .3 .7 GEY 1.2 96 MAY 15 634 30.57 38 2.20 118 33.92 2.46 14 .05 .3 4.0 MOL 1.8 96 MAY 15 641 32.99 37 34.52 118 51.42 8.23 21 .08 .3 .5 MOR 1.7 96 MAY 15 647 0.19 37 9.13 121 33.27 3.18 8 .05 .4 1.1 CYN 1.0 96 MAY 15 946 59.39 37 47.90 122 12.21 9.67 35 3 .16 .3 .8 HAY 1.4 96 MAY 15 1023 54.65 38 50.03 123 0.33 5.39 9 .06 .5 1.5 MAA 1.3 96 MAY 15 1025 56.94 37 35.89 118 55.06 5.32 17 .11 .3 .5 SIL 1.4 96 MAY 15 1307 2.41 38 48.01 122 48.78 4.31 13 .02 .3 .5 GEY 1.4 96 MAY 15 1526 54.14 37 34.36 118 49.37 5.82 12 .11 .7 .8 MOR 1.1 96 MAY 15 1529 48.88 38 49.35 122 47.66 4.13 22 .05 .2 .5 GEY 1.9 96 MAY 15 1530 31.74 38 49.13 122 47.65 4.27 8 .04 .4 .9 GEY 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 96 MAY 15 1714 49.45 38 49.38 122 48.03 3.63 7 .02 .4 .8 GEY 1.5 96 MAY 15 2053 28.95 38 47.48 122 46.62 4.48 8 .03 .3 .8 GEY 1.7 96 MAY 15 2136 2.16 38 49.72 122 49.90 0.27 12 .06 .3 .8 GEY 1.8 96 MAY 15 2216 17.54 37 37.10 118 51.60 5.51 10 .10 .6 .9 SMO 1.4 96 MAY 15 2246 24.00 37 37.10 118 52.08 2.72 9 .07 .4 .9 SMO 1.9 96 MAY 15 2247 13.66 37 37.59 118 51.58 4.03 7 .09 .6 1.3 SMO 2.1 96 MAY 15 2248 30.02 37 37.06 118 52.11 2.94 16 .08 .3 .7 SMO 2.2 96 MAY 15 2249 36.12 37 37.64 118 51.97 0.04 7 .26 1.3 1.0 SMO * 1.8 96 MAY 15 2257 36.11 37 37.48 118 51.63 4.14 8 .08 .6 1.2 SMO 1.6 96 MAY 15 2258 28.08 37 37.44 118 52.08 2.46 18 .13 .4 .8 SMO 2.5 96 MAY 15 2310 12.22 37 37.69 118 51.60 3.91 7 .08 .5 1.2 SMO 1.6 96 MAY 15 2335 59.55 37 36.71 118 51.68 5.62 12 .07 .5 .5 SMO 1.4 96 MAY 15 2339 23.44 37 37.45 118 52.01 2.86 13 .10 .5 .9 SMO 1.8 96 MAY 15 2353 17.05 38 46.57 122 40.35 4.26 12 .06 .5 .6 KON 1.9 96 MAY 16 6 57.06 37 37.08 118 52.02 2.51 11 .07 .4 .9 SMO 2.0 96 MAY 16 9 59.36 37 37.30 118 51.72 3.43 7 .09 .6 1.3 SMO 1.5 96 MAY 16 200 51.19 37 28.49 118 52.39 4.21 23 .08 .3 1.6 MOR 2.6 96 MAY 16 242 38.11 37 19.46 118 31.93 14.74 11 .15 2.2 2.5 KAI 1.6 96 MAY 16 248 6.16 38 55.82 122 37.84 2.93 22 .15 .3 .9 KON 2.5 96 MAY 16 406 29.58 37 28.51 118 52.43 4.96 18 .08 .4 1.7 MOR 2.1 96 MAY 16 411 36.47 37 28.54 118 52.37 4.87 22 .08 .4 1.5 MOR 2.8 96 MAY 16 539 4.28 38 48.74 122 48.48 4.05 27 .17 .3 .7 GEY 2.4 96 MAY 16 633 58.09 37 36.48 118 50.92 6.33 11 .06 .6 .5 SMO 1.6 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 ------------------------------------------------------------------------------- MAY 05 043845.9* 12.051N 88.047W 33N 4.1 0.6 19 OFF COAST OF CENTRAL AMERICA. MD 3.7 (SSS). Felt (II) at San Salvador, El Salvador. 081338.4& 47.755N 121.873W 10 7 WASHINGTON. . MD 2.7 152550.5? 6.66 S 154.80 E 33N 4.7 0.9 10 SOLOMON ISLANDS 204217.4* 15.450N 41.941E 10G 4.4 0.5 12 RED SEA 234002.0? 6.16 S 153.77 E 33N 4.3 1.0 6 NEW BRITAIN REGION, P.N.G. MAY 06 051824.1? 14.82 S 167.10 E 200G 4.0 1.0 10 VANUATU ISLANDS 082132.2 42.973N 144.108E 100G 4.4 0.9 59 HOKKAIDO, JAPAN REGION 094139.5* 41.342S 86.326W 10G 4.8 1.1 31 WEST CHILE RISE 111506.3% 12.655N 125.513E 33N 4.4 1.1 13 SAMAR, PHILIPPINE ISLANDS 123243.3* 32.764N 139.360E 185* 3.8 1.2 16 SOUTH OF HONSHU, JAPAN 123805.7* 3.688S 145.525E 33N 4.3 1.3 19 NEAR N COAST OF NEW GUINEA, PNG. 130156.8* 2.706N 125.733E 33N 4.7 1.1 22 TALAUD ISLANDS, INDONESIA 175854.9% 6.671S 143.102E 33N 4.1 1.5 10 NEW GUINEA, PAPUA NEW GUINEA 183056.5* 5.920S 77.277W 23D 4.5 0.9 26 NORTHERN PERU 202717.2% 11.793N 86.595W 80* 4.2 0.8 17 NEAR COAST OF NICARAGUA MAY 07 011650.3* 57.150S 147.585E 10G 5.0 0.7 17 WEST OF MACQUARIE ISLAND 014823.1 61.450N 149.987W 33N 0.8 13 SOUTHERN ALASKA. ML 3.3 (PMR). 025359.3* 13.009N 89.200W 33N 0.4 11 EL SALVADOR. MD 3.2 (SSS). Felt 031751.0& 47.760N 121.850W 5 7 WASHINGTON. . MD 2.4 043917.0& 47.780N 121.750W 10 8 WASHINGTON. . MD 2.7 060426.4 63.476N 151.425W 33N 0.6 12 CENTRAL ALASKA. ML 3.2 (PMR). 073001.0& 47.750N 121.850W 5 8 WASHINGTON. . MD 2.7 121302.7* 22.824S 175.272W 33N 5.1 1.0 22 TONGA ISLANDS REGION 131555.6* 26.794S 70.572W 33N 4.4 0.6 13 NEAR COAST OF NORTHERN CHILE. Felt (V) at Copiapo and Tierra Amarilla; (IV) at Caldera, Chanaral and Taltal; (III) at Diego de Almagro, Potrerillos and Salvador. 145323.6 62.782N 152.093W 10G 0.9 12 CENTRAL ALASKA. ML 3.7 (PMR). 151034.9 62.799N 152.060W 33N 0.9 13 CENTRAL ALASKA. ML 3.5 (PMR). 161644.6? 6.95 S 154.80 E 33N 4.9 1.0 15 SOLOMON ISLANDS 173704.5* 7.664S 156.199E 33N 4.9 1.1 21 SOLOMON ISLANDS 182558.7? 16.25 N 97.40 W 33N 4.5 1.3 15 OAXACA, MEXICO 203814.6? 1.23 N 124.81 E 118* 5.0 1.1 23 MINAHASSA PENINSULA, SULAWESI 225236.9 63.311N 151.328W 33N 1.1 11 CENTRAL ALASKA. ML 3.0 (PMR). 234622.5 32.709N 115.417W 15G 0.8 25 CALIF.-BAJA CALIF. BORDER REGION. ML 2.8 (GS). Felt. MAY 08 012327.0* 6.769N 73.115W 176? 3.9 1.1 20 NORTHERN COLOMBIA 012438.1* 16.309N 99.990W 33N 4.1 0.9 24 NEAR COAST OF GUERRERO, MEXICO 020358.0* 40.793N 109.523E 33N 3.9 0.9 8 WESTERN NEI MONGOL, CHINA 023810.8* 23.396S 179.874W 600G 4.3 1.2 20 SOUTH OF FIJI ISLANDS 030537.3* 27.727N 60.256E 33N 3.8 0.9 20 SOUTHERN IRAN 040947.9* 28.353N 113.165W 10G 3.5 0.8 17 BAJA CALIFORNIA, MEXICO 042551.8 34.953N 140.349E 90D 4.3 1.0 59 NEAR EAST COAST OF HONSHU, JAPAN 061016.5? 16.75 N 99.73 W 26D 4.1 1.4 10 NEAR COAST OF GUERRERO, MEXICO 065707.3* 14.613N 92.475W 83? 4.1 1.4 21 NEAR COAST OF CHIAPAS, MEXICO 073523.9* 52.089N 169.283W 33N 4.0 1.2 24 FOX ISLANDS, ALEUTIAN ISLANDS 085715.0 7.137S 155.202E 33N 4.4 1.0 25 SOLOMON ISLANDS 090100.0? 6.02 S 77.60 W 100G 3.9 1.5 9 NORTHERN PERU 093935.2 28.618S 68.785W 100G 4.1 0.8 21 LA RIOJA PROVINCE, ARGENTINA 100036.6 51.660N 173.249W 33N 4.3 1.1 72 ANDREANOF ISLANDS, ALEUTIAN IS. 103441.2* 39.015S 177.564E 33N 4.6 1.0 9 OFF E. COAST OF N. ISLAND, N.Z. 120352.7* 16.467S 173.976W 33N 4.5 0.9 25 TONGA ISLANDS 123153.4* 34.916N 72.621E 59? 4.1 0.8 13 PAKISTAN 131904.1 23.248S 69.823W 54D 4.4 1.0 23 NORTHERN CHILE 132751.4* 2.846S 77.857W 33N 4.4 1.5 21 PERU-ECUADOR BORDER REGION 133217.1? 16.61 N 99.88 W 33N 4.1 1.2 18 NEAR COAST OF GUERRERO, MEXICO 152444.6* 37.519S 77.937E 10G 4.4 0.7 14 MID-INDIAN RIDGE 173241.2* 6.926S 107.685E 161* 3.7 1.5 15 JAWA, INDONESIA 205611.9* 29.108N 129.870E 68 3.8 1.2 21 RYUKYU ISLANDS MAY 09 004215.1* 6.872S 148.118E 33N 4.5 4.6 1.3 16 NEW BRITAIN REGION, P.N.G. 005039.6* 4.607N 73.103W 56? 4.5 0.9 34 COLOMBIA 030824.3* 51.628N 175.064W 33N 3.6 0.9 8 ANDREANOF ISLANDS, ALEUTIAN IS. 035240.7? 34.47 N 24.32 E 33N 3.9 0.5 8 CRETE 043603.7 32.615S 179.430W 77D 5.4 1.0 99 SOUTH OF KERMADEC ISLANDS. 050851.6* 37.502N 71.975E 84? 3.6 0.9 10 AFGHANISTAN-TAJIKISTAN BORD REG. 064235.6* 31.529N 140.014E 62? 3.9 0.9 16 SOUTH OF HONSHU, JAPAN 082545.0* 32.861N 76.348E 60? 3.9 0.6 16 KASHMIR-INDIA BORDER REGION 102815.4& 65.030N 148.820W 22 30 NORTHERN ALASKA. . ML 3.1 105842.5 40.619N 48.384E 33N 4.2 1.0 39 EASTERN CAUCASUS 114456.9* 1.190N 123.098E 53? 4.7 4.5 1.2 28 MINAHASSA PENINSULA, SULAWESI 120515.6 35.787N 140.217E 79* 3.9 0.8 17 NEAR EAST COAST OF HONSHU, JAPAN 145753.4 36.285N 141.793E 33N 4.3 1.0 37 NEAR EAST COAST OF HONSHU, JAPAN 150405.0? 24.36 S 176.80 W 100G 4.4 1.1 11 SOUTH OF FIJI ISLANDS 150914.9* 71.615N 2.550W 10G 3.7 1.0 9 JAN MAYEN ISLAND REGION 154737.7* 10.931S 114.131E 33N 4.2 1.4 17 SOUTH OF BALI, INDONESIA 164426.7* 15.969S 74.895W 33N 4.7 1.2 33 NEAR COAST OF PERU 170929.6 2.768S 141.157E 33N 4.1 0.9 21 NEAR N COAST OF NEW GUINEA, PNG. 175156.7 52.295N 168.971W 33N 4.7 1.2 87 FOX ISLANDS, ALEUTIAN ISLANDS. Felt (III) at Nikolski. 180358.3% 32.491S 72.095W 33N 0.7 11 OFF COST-CENTRAL CHILE. MD 3.8 185634.8* 20.637S 178.939W 500G 4.3 0.6 29 FIJI ISLANDS REGION 200829.3 34.317N 26.506E 16D 4.2 1.3 37 CRETE 215415.0 18.999N 104.372W 33N 4.8 4.5 1.0 107 NEAR COAST OF JALISCO, MEXICO MAY 10 005022.5& 62.130N 149.760W 51 2.8 30 CENTRAL ALASKA. . ML 3.6 (AEIC), 3.6 (PMR). Felt (II) at Talkeetna. 021030.7 36.305N 141.807E 33N 4.6 0.9 60 NEAR EAST COAST OF HONSHU, JAPAN 021124.0 36.187N 141.796E 33N 4.7 0.8 46 NEAR EAST COAST OF HONSHU, JAPAN 030631.0* 26.287N 128.512E 31D 3.7 1.5 12 RYUKYU ISLANDS 032756.3 1.515N 126.669E 33N 4.7 1.4 31 NORTHERN MOLUCCA SEA 042649.6 30.002N 88.093E 33N 4.4 0.9 29 XIZANG 042703.7* 36.258N 141.954E 33N 3.4 1.0 14 NEAR EAST COAST OF HONSHU, JAPAN 043527.8? 2.83 S 77.83 W 33N 4.5 0.8 12 PERU-ECUADOR BORDER REGION 053645.1% 31.917S 71.409W 40G 0.3 10 NEAR COST-CENTRAL CHILE. MD 3.4 064108.0& 47.750N 121.860W 6 64 WASHINGTON. . ML 2.7 072754.8 62.225N 149.777W 60G 4.7 0.8 42 CENTRAL ALASKA. Felt throughout southcentral Alaska. 082344.5 17.764S 175.077W 232D 4.1 0.6 29 TONGA ISLANDS 090701.9 30.040N 88.150E 33N 4.6 0.8 37 XIZANG 101938.1 13.995S 74.436W 101D 5.4 0.8 113 CENTRAL PERU. Felt (V) at Huanca Sancos; (IV) at Puquio, Palpa and Nazca; (III) at Coracora and (II) at Ica. 152300.2* 30.832N 50.193E 33N 4.2 0.8 17 NORTHERN IRAN 172248.0* 33.439S 70.035W 101D 4.4 0.7 16 CHILE-ARGENTINA BORDER. Felt (IV) at Santiago, (III) at Rancagua and (II) at Valparaiso. 190359.3 25.999N 128.625E 24 3.4 0.6 13 RYUKYU ISLANDS 221737.5 36.297N 141.867E 33N 4.5 1.0 17 NEAR EAST COAST OF HONSHU, JAPAN MAY 11 021845.4 19.277N 64.949W 37D 5.3 4.6 1.0 76 VIRGIN ISLANDS. Felt at San Juan, Puerto Rico. 035851.6* 30.294N 87.926E 33N 4.9 0.5 28 XIZANG 043837.2 80.568N 2.255W 10G 5.4 5.6 0.9 125 NORTH OF SVALBARD. Mw 5.5 (GS), 050928.2 59.849N 151.327W 33N 3.3 1.1 13 KENAI PENINSULA, ALASKA 082829.2* 0.590S 135.408E 33N 5.1 0.8 12 IRIAN JAYA REGION, INDONESIA 093507.5 3.397S 135.830E 33N 5.4 5.7 1.0 34 IRIAN JAYA REGION, INDONESIA. 134345.1 6.649S 155.053E 33N 5.7 6.4 0.7 84 SOLOMON ISLANDS. Mw 6.3 (GS), 153352.8% 32.628S 70.394W 100G 0.4 10 CHILE-ARGENTINA BORDER. MD 3.2 162925.1* 6.738S 154.349E 33N 5.4 5.3 0.6 37 SOLOMON ISLANDS 164145.3* 52.064N 30.213W 10G 4.8 0.8 30 NORTHERN MID-ATLANTIC RIDGE 172519.7? 6.77 S 154.37 E 33N 5.2 0.5 11 SOLOMON ISLANDS MAY 12 045210.7* 18.527N 63.753W 33N 4.7 0.8 35 LEEWARD ISLANDS MAY 13 015519.3 32.995N 140.736E 33N 4.7 0.6 24 SOUTH OF HONSHU, JAPAN 045347.4 7.182N 76.907W 27D 5.1 4.3 0.8 59 NORTHERN COLOMBIA 095920.3* 4.731S 145.169E 195D 5.2 1.0 20 NEAR N COAST OF NEW GUINEA, PNG. 185106.6* 51.616N 173.539W 33N 4.5 1.3 24 ANDREANOF ISLANDS, ALEUTIAN IS. MAY 14 043444.0* 20.321S 69.190W 118* 4.9 0.8 40 NORTHERN CHILE 101424.4* 52.273N 169.136W 33N 4.4 1.0 29 FOX ISLANDS, ALEUTIAN ISLANDS 110623.7* 18.883N 64.895W 33N 4.5 0.7 12 VIRGIN ISLANDS 123659.7 17.777S 178.734W 606D 5.5 0.7 86 FIJI ISLANDS REGION 123729.0 17.790S 178.593W 600G 4.8 0.7 39 FIJI ISLANDS REGION 173410.5* 24.275S 177.753W 168D 5.2 0.5 39 SOUTH OF FIJI ISLANDS 230855.4* 18.830S 174.048W 54D 5.3 0.5 50 TONGA ISLANDS MAY 15 162849 Q 0.5 S 135.7 E 33N 5.7 1.0 26 IRIAN JAYA REGION, INDONESIA MAY 16 154102 Q 42.6 N 111.3 W 10G 1.2 17 EASTERN IDAHO. ML 4.3 (GS). 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.