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 February 8 - 14, 1996 Stephen R. Walter U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 San Francisco Bay Area Another quiet week in the Bay Area. During the seven-day period ending at midnight on Wednesday, February 14, 1996 the U.S. Geological Survey office in Menlo Park recorded 11 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 22 earthquakes during the previous seven-day period (February 1 -7), two of which was as large as M2.0. All the M2+ activity occurred on the creeping segment of the San Andreas beginning with a pair of M2's 12 miles southeast of Hollister (#1/1) and ending with a M2.9 and a M3.1 eight miles southeast of Watsonville (#4/1). The Calaveras fault was almost entirely quiet at the M1 level and above. Two events in the North Bay, though small, are worth mentioning. On Monday a M1.6 occurred on the southern Rogers Creek fault about six miles northeast of Novato (#3/1). Early Wednesday morning a M1.5 occurred on the San Andreas fault just offshore of Pacifica. Northern & Central California It was a relatively quiet week with only one earthquake as large as M3, aside from the M3.1 near Watsonville discussed above. This M3.1 event occurred early Wednesday morning in the Cape Mendocino area, about 13 miles northeast of Petrolia (#8/2). It was preceded early Tuesday morning by a M2.9 beneath the coast about 13 miles southwest of Eureka. Central California was also quiet with several M2's on the creeping San Andreas north of the Pinnacles (#3/2), a M2.0 near San Ardo (#5/2), and a M2.5 five miles northeast of Coalinga (#7/2). Ditto with the eastern Sierra Nevada where the only notable activity was in the Long Valley caldera (see below). Otherwise it was quiet with single M2's southeast of Lone Pine (#1/2), northwest of Bishop (#4/2), east of Markleeville (#9/2), and east of Quincy (#6/2). The latter earthquake was an aftershock to a M3.9 that rocked this area on February 1st. Long Valley Caldera As the graph in Figure 3 shows, there was a sharp increase in activity in the Mammoth Lakes area during the past week with over 40 earthquakes larger than 1.5. This increase was caused by a resurgence in activity on the south side of the caldera about one mile south of the airport, an area that had been active at the M2 level for the past three weeks (#1/3). The activity began last Friday with numerous very small events. It wasn't until Monday that any were as large as M2. Activity continued at the rate of105 to 30 events per hour through Tuesday, though many events were too small to be located. The activity slowed markedly on Wednesday before resuming again in the late afternoon. Activity continued into Thursday with two M3 shocks. The largest, a M3.6, was probably felt in Mammoth Lakes. USA Seismicity (February 4 - 14) The National Earthquake Information Center reported no earthquakes of note in the lower 48 states outside of California. However they did report several moderate events on the Blanco Fracture zone about 100 miles off the coast of Oregon (#1/4). Notable earthquakes in southern California included a M3.7 that was felt at Yucca Valley (#2/4) and a M2.9 that was felt at Upland (#3/4). The Planet Earth (February 4 - 14) There were no earthquakes as large as M6 on the planet during the past week. The two largest shocks were a pair of M5.9's, the first offshore of the central Kuril Island (#5/5), the second near the southern Izu Islands south of Honshu, Japan (#6/5). Only slightly smaller were a M5.8 in eastern New Guinea (#3/5) and a M5.7 south of Sumbawa, Indonesia (#4/5). 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 FEB 8 832 46.62 36 34.36 121 8.57 6.98 9 .06 .4 1.2 PIN .8 96 FEB 8 844 2.08 36 35.18 118 2.40 17.39 13 1 .25 1.0 4.2 OWV 2.1 96 FEB 8 1057 27.15 37 38.03 118 51.60 13.04 15 .07 .7 1.4 SMO 1.1 96 FEB 8 1106 35.14 37 37.30 118 52.68 10.41 14 .07 .7 .6 SMO 1.3 96 FEB 8 1250 21.63 38 52.05 122 56.63 6.11 15 .08 .3 1.0 MAA 1.7 96 FEB 8 1322 44.20 39 50.75 122 26.57 4.79 9 2 .49 2.234.2 SAC - 1.3 96 FEB 8 1417 4.02 40 19.05 119 53.21 3.31 11 3 .11 1.1 1.1 NEV 2.0 96 FEB 8 1443 20.15 38 50.34 122 48.70 2.21 12 .03 .3 .6 GEY 1.7 96 FEB 8 1603 25.85 36 34.47 121 10.22 5.49 9 .05 .4 .8 PIN 1.1 96 FEB 8 1608 2.86 36 34.46 121 10.09 5.74 47 2 .06 .2 .4 PIN 2.3 96 FEB 8 1623 37.56 36 34.46 121 10.17 5.99 31 1 .06 .2 .5 PIN 1.6 96 FEB 8 1633 49.86 37 38.00 118 51.64 13.63 12 .05 .8 1.1 SMO 1.3 96 FEB 8 1715 50.24 35 31.52 118 25.09 10.32 11 .05 .4 1.0 WWF 1.7 96 FEB 8 1833 31.04 36 34.44 121 10.26 5.58 10 1 .04 .3 .7 PIN .9 96 FEB 8 1907 17.58 35 31.52 118 24.96 11.08 10 .03 .3 .9 WWF 1.9 96 FEB 8 1910 36.63 35 31.57 118 24.98 11.08 12 .07 .3 1.0 WWF 1.8 96 FEB 8 2027 57.64 37 37.99 118 51.93 12.53 7 .08 1.2 2.8 SMO 1.1 96 FEB 8 2125 0.72 35 31.52 118 24.86 10.03 14 .07 .3 1.0 WWF 2.1 96 FEB 8 2223 20.76 38 49.50 122 47.95 3.74 7 .06 .4 1.0 GEY 1.2 96 FEB 9 19 35.10 38 47.53 122 45.43 1.90 7 .02 .4 .8 GEY 1.2 96 FEB 9 52 23.98 38 47.67 122 46.69 2.36 8 .02 .3 .6 GEY 1.7 96 FEB 9 214 57.76 37 29.62 118 48.40 8.87 27 .06 .3 .9 MOR 1.8 96 FEB 9 304 31.04 37 39.01 118 53.16 4.64 7 .17 .9 1.7 DOM 1.4 96 FEB 9 603 25.53 38 43.77 119 35.34 7.45 13 2 .11 1.4 1.5 WAK 1.3 96 FEB 9 644 14.88 37 38.12 118 51.69 13.87 13 .05 .7 1.4 SMO 1.3 96 FEB 9 717 25.36 38 47.15 122 45.37 1.81 7 .01 .3 .9 GEY 1.6 96 FEB 9 743 23.45 37 37.15 118 52.76 10.12 19 .08 .4 .6 SMO 1.3 96 FEB 9 850 3.58 37 37.02 118 52.43 10.12 19 .08 .6 .7 SMO 1.3 96 FEB 9 957 9.50 37 26.35 118 29.17 8.97 28 1 .07 .5 1.1 CHA 2.5 96 FEB 9 1023 0.06 36 41.74 121 19.57 4.65 60 1 .07 .2 .3 STN 2.5 96 FEB 9 1335 30.87 37 37.62 118 52.43 9.77 20 1 .11 .6 .7 SMO 1.3 96 FEB 9 1554 55.09 36 37.55 121 6.46 7.54 15 .12 .4 1.0 BVL 1.1 96 FEB 9 1904 44.89 38 50.65 122 49.14 1.49 7 .01 1.5 2.5 GEY 1.3 96 FEB 9 2228 52.35 38 45.00 122 44.14 0.08 9 .47 1.6 3.8 GEY * 1.8 96 FEB 9 2306 20.96 37 37.29 118 52.96 10.01 23 .08 .4 .5 SMO 1.9 96 FEB 9 2307 43.63 35 52.79 120 12.55 19.11 23 .27 1.7 1.2 COA 2.0 96 FEB 9 2324 55.89 37 37.65 118 52.70 8.91 8 .12 .9 1.4 SMO 1.4 96 FEB 9 2328 20.12 37 37.86 118 51.45 12.94 16 1 .07 .7 1.1 SMO 1.3 96 FEB 9 2344 18.06 37 37.58 118 52.93 9.08 25 .07 .3 .4 SMO 2.0 96 FEB 9 2348 0.49 37 37.99 118 52.00 12.69 8 .07 1.1 2.2 SMO 1.4 96 FEB 9 2351 30.50 37 37.46 118 53.05 9.77 19 .08 .4 .6 SMO 1.5 96 FEB 9 2357 58.70 37 37.46 118 52.82 9.80 7 .13 .9 1.5 SMO 1.1 96 FEB 10 5 26.32 37 37.48 118 52.91 9.51 18 .06 .4 .5 SMO 1.6 96 FEB 10 29 50.35 37 37.36 118 52.76 9.58 20 .08 .5 .5 SMO 1.5 --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 FEB 10 230 1.39 37 29.01 118 59.85 8.95 15 .06 .4 1.6 SIL 1.4 96 FEB 10 258 18.43 36 51.00 121 35.01 7.11 59 1 .14 .2 .4 SJB 2.1 96 FEB 10 455 14.57 37 30.75 118 46.47 6.26 18 .06 .3 1.3 WCN 1.2 96 FEB 10 501 22.88 37 38.22 118 52.18 11.60 7 .07 1.1 2.2 SMO 1.2 96 FEB 10 520 19.55 36 37.44 121 14.30 6.74 14 .03 .3 .9 STN 1.4 96 FEB 10 531 31.49 37 30.73 118 46.50 6.20 17 .06 .4 1.2 MOR 1.1 96 FEB 10 816 22.59 39 6.84 122 58.83 7.31 9 .06 .4 1.0 MAA 1.7 96 FEB 10 855 58.20 38 46.95 122 45.69 2.48 15 .05 .2 .6 GEY 1.6 96 FEB 10 924 20.40 36 0.56 120 53.21 8.00 33 .04 .2 .4 ROB 2.0 96 FEB 10 946 28.69 37 37.28 118 53.10 9.52 25 .09 .4 .5 SMO 1.8 96 FEB 10 1058 24.63 39 54.88 120 47.52 1.26 25 .18 .416.0 WAK - 2.3 96 FEB 10 1144 52.18 37 36.94 118 52.83 10.03 21 .08 .5 .5 SHE 1.3 96 FEB 10 1201 6.43 37 38.89 119 3.09 5.15 12 .08 .5 1.0 MAM 1.2 96 FEB 10 1248 7.87 36 11.12 120 18.25 10.49 36 .08 .2 .4 COA 2.5 96 FEB 10 1541 58.33 37 39.09 119 2.88 4.08 14 .05 .4 1.1 MAM 1.1 96 FEB 10 1542 56.35 37 37.51 118 51.02 4.08 10 .05 .4 .7 SMO 1.3 96 FEB 10 1707 32.83 37 31.36 118 48.05 1.94 12 .05 .7 8.3 MOR - 1.2 96 FEB 10 1740 28.11 37 34.97 119 0.72 4.13 15 .07 .6 .8 SIL 1.3 96 FEB 10 1950 40.41 37 37.58 118 52.77 9.85 20 .11 .5 .7 SMO 1.5 96 FEB 10 1953 57.95 37 36.80 118 52.75 10.48 9 .08 .7 .9 SHE 1.4 96 FEB 10 2012 22.79 37 37.37 118 53.01 9.79 21 .08 .4 .6 SMO 1.5 96 FEB 10 2048 53.77 36 48.65 121 31.17 4.24 33 .17 .3 .6 SJB 1.9 96 FEB 10 2219 20.07 40 32.62 121 39.08 9.82 8 .04 .6 1.3 SHA 1.7 96 FEB 10 2313 47.28 38 47.11 122 45.51 0.02 8 .28 .8 3.0 GEY * 1.2 96 FEB 11 517 29.24 38 48.62 122 45.16 0.81 8 .05 .3 .9 GEY 1.3 96 FEB 11 602 34.22 38 46.96 122 45.50 1.18 11 .05 .3 .8 GEY 1.6 96 FEB 11 913 53.72 37 36.37 118 54.10 6.13 12 .07 .4 .6 SHE 1.7 96 FEB 11 1350 31.12 37 38.24 118 52.99 9.41 8 .21 2.6 1.5 SMO 1.5 96 FEB 11 1435 31.60 37 37.42 118 52.62 8.58 7 .02 .6 .9 SMO 1.5 96 FEB 11 2056 18.42 38 47.93 122 44.52 1.51 11 .05 .3 .7 GEY 1.7 96 FEB 11 2202 19.86 39 57.12 120 51.55 0.04 16 1 .17 .4 2.6 WAK * 2.0 96 FEB 11 2333 17.45 38 49.62 122 47.90 3.98 9 .03 .3 .8 GEY 1.4 96 FEB 12 140 34.82 38 45.81 122 43.25 0.02 7 .30 1.2 1.9 GEY * 1.4 96 FEB 12 145 30.74 36 16.59 120 23.92 9.60 28 1 .08 .2 .3 COA 1.9 96 FEB 12 428 53.79 40 50.61 121 13.03 7.95 8 3 .07 1.0 9.5 MOD - 1.7 96 FEB 12 554 2.03 36 14.69 120 48.13 6.95 36 3 .11 .3 .4 BIT 2.0 96 FEB 12 623 56.63 38 51.24 122 49.13 1.24 9 .06 .3 1.0 GEY 1.4 96 FEB 12 644 47.81 39 28.34 121 31.99 3.77 17 3 .07 .3 .8 ORO 2.1 96 FEB 12 1212 23.12 37 33.08 118 51.41 8.97 22 1 .07 .3 .6 MOR 1.8 96 FEB 12 1503 46.61 38 48.32 122 46.34 2.24 8 .04 .3 .6 GEY 1.6 96 FEB 12 1813 33.16 38 49.94 122 46.52 1.91 29 .06 .2 .4 GEY 2.4 96 FEB 12 1851 6.92 38 49.92 122 47.85 1.47 17 .05 .2 .6 GEY 2.2 96 FEB 12 1918 19.57 38 50.76 122 49.11 2.53 8 .05 .6 1.5 GEY 1.3 96 FEB 12 1956 7.03 37 37.87 118 52.70 8.15 9 .12 1.1 .9 SMO 1.2 96 FEB 12 2015 32.61 37 36.84 118 52.42 10.00 15 .09 .6 .7 SHE 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 FEB 12 2019 18.86 37 37.65 118 52.56 8.34 11 .12 .7 .6 SMO 1.4 96 FEB 12 2020 37.89 39 6.99 122 57.37 6.75 8 .05 .6 1.0 MAA 1.7 96 FEB 12 2121 11.70 37 37.28 118 52.40 9.19 27 3 .06 .3 .4 SMO 1.9 96 FEB 12 2133 35.07 37 37.14 118 52.49 8.97 10 .05 .5 .7 SMO 1.4 96 FEB 12 2200 51.50 40 19.51 124 30.98 20.36 9 .04 2.5 .4 MEN 2.3 96 FEB 12 2242 39.89 37 37.11 118 52.58 9.05 9 .06 .7 .7 SMO 1.2 96 FEB 12 2321 22.93 37 37.15 118 52.61 9.11 11 .06 .6 .7 SMO 1.3 96 FEB 12 2322 10.20 37 37.31 118 52.58 9.57 17 .07 .4 .7 SMO 2.1 96 FEB 12 2338 33.51 38 9.40 122 28.40 9.91 15 2 .14 .5 1.0 ROG 1.6 96 FEB 13 7 47.58 37 36.85 118 52.55 9.73 12 .13 .7 .8 SHE 1.7 96 FEB 13 10 9.42 37 37.08 118 52.66 9.18 17 .07 .4 .6 SMO 2.0 96 FEB 13 54 6.57 37 36.68 118 52.31 10.45 18 3 .08 .5 .4 SHE 1.3 96 FEB 13 234 38.82 36 33.39 121 9.05 7.12 19 .06 .3 .7 PIN 1.7 96 FEB 13 243 5.55 36 35.05 121 11.20 6.54 34 .08 .2 .6 PIN 2.1 96 FEB 13 307 18.05 36 42.02 121 19.95 4.07 54 2 .07 .1 .3 STN 2.3 96 FEB 13 432 14.81 39 20.50 123 17.06 6.89 13 4 .04 .3 1.0 MAA 1.4 96 FEB 13 550 53.43 38 44.61 122 41.80 1.93 33 1 .08 .2 .5 NAP 2.3 96 FEB 13 613 25.28 38 46.92 122 45.74 1.72 8 .03 .3 .8 GEY 1.3 96 FEB 13 649 52.48 37 37.40 118 52.65 9.66 17 .15 .7 .9 SMO 2.3 96 FEB 13 657 14.97 36 36.85 121 10.13 7.15 52 .12 .2 .5 BVL 2.5 96 FEB 13 929 1.90 37 37.29 118 52.67 8.69 9 .05 .6 1.1 SMO 1.4 96 FEB 13 949 6.60 40 36.96 124 17.39 18.73 13 .05 .6 .4 EUR 2.9 96 FEB 13 1048 11.48 37 36.59 118 52.54 10.48 12 .07 .6 .7 SHE 1.6 96 FEB 13 1049 18.30 37 37.33 118 52.69 9.11 9 .05 .7 .6 SMO 1.5 96 FEB 13 1423 14.64 37 37.20 118 52.51 8.91 9 .07 .6 .8 SMO 1.2 96 FEB 13 1438 27.52 36 43.58 121 18.55 9.54 11 .03 .4 .8 PAI 1.2 96 FEB 13 1439 24.30 37 37.13 118 52.65 9.55 19 .14 .5 1.0 SMO 2.1 96 FEB 13 1442 20.82 37 33.24 118 46.82 4.82 8 .46 2.3 5.8 MOR 2.1 96 FEB 13 1454 36.47 37 37.23 118 52.53 9.03 11 .05 .5 .8 SMO 1.8 96 FEB 13 1621 58.10 38 42.66 119 36.07 5.20 21 .11 .6 2.0 WAK 2.7 96 FEB 13 1804 50.98 37 37.23 118 52.65 8.83 14 .07 .5 .7 SMO 1.8 96 FEB 13 1807 47.45 37 37.07 118 52.45 8.79 9 .05 .6 .6 SMO 1.1 96 FEB 13 1828 56.94 37 37.12 118 52.65 9.26 19 .08 .4 .7 SMO 2.3 96 FEB 13 1832 15.86 37 35.93 118 51.85 10.80 10 .08 1.2 .9 MOR 1.1 96 FEB 13 2003 15.73 37 36.82 118 52.40 9.95 7 .06 1.3 1.3 SHE 1.2 96 FEB 13 2011 30.71 39 28.85 123 19.37 7.46 17 1 .07 .2 .6 MAA 1.9 96 FEB 13 2032 23.67 37 37.14 118 52.54 9.56 12 .06 .5 .7 SMO 1.7 96 FEB 13 2032 48.64 37 38.09 118 52.46 9.16 10 .10 1.2 .9 SMO 1.8 96 FEB 13 2129 26.83 37 37.19 118 52.65 9.09 10 .06 .5 .7 SMO 1.5 96 FEB 13 2207 36.22 37 37.55 118 52.29 8.20 9 .11 .9 1.5 SMO 1.4 96 FEB 13 2211 16.85 37 37.71 118 52.53 8.63 9 .12 1.0 1.6 SMO 1.1 96 FEB 13 2225 27.20 37 37.64 118 52.30 7.93 8 .11 1.0 1.5 SMO 1.3 96 FEB 13 2240 9.63 38 47.24 122 44.85 0.44 18 .36 .7 2.0 GEY 2.2 96 FEB 13 2316 28.65 36 57.74 121 42.10 1.71 10 .07 .5 2.9 SJB 1.2 96 FEB 13 2353 32.71 37 37.44 118 51.63 11.71 7 .09 1.3 3.3 SMO 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 FEB 14 53 51.09 37 30.39 118 40.49 11.15 7 .02 .6 2.2 WCN 1.4 96 FEB 14 127 7.62 36 19.66 121 50.80 8.53 19 .04 .6 .9 SUR 1.7 96 FEB 14 318 47.15 36 50.30 121 18.36 5.96 25 .07 .3 .6 QUI 1.4 96 FEB 14 421 14.44 37 37.36 118 52.67 9.09 12 .05 .5 .6 SMO 1.8 96 FEB 14 439 25.06 35 45.65 121 16.00 1.00 20 2 .06 .4 1.3 SSM 2.0 96 FEB 14 722 26.75 37 29.23 118 50.86 8.61 15 .04 .3 1.4 MOR 1.5 96 FEB 14 846 26.75 37 37.69 118 52.78 8.74 8 .11 1.0 1.5 SMO 1.6 96 FEB 14 951 49.58 36 34.38 121 10.07 5.93 23 .04 .2 .6 PIN 1.8 96 FEB 14 1006 21.19 37 37.90 118 52.39 8.30 7 .09 .7 1.3 SMO 1.2 96 FEB 14 1110 45.92 37 36.71 118 57.46 10.21 8 .04 .6 1.2 SHE 2.0 96 FEB 14 1151 55.36 38 47.02 122 45.67 2.39 7 .01 .3 .9 GEY 1.0 96 FEB 14 1200 49.63 37 37.34 118 52.72 8.71 10 .05 .5 .6 SMO 1.5 96 FEB 14 1404 11.44 40 18.15 121 58.60 17.69 17 1 .12 .5 2.1 SHA 1.7 96 FEB 14 1428 48.80 40 23.30 124 3.59 9.66 13 .11 .3 .7 MEN 3.1 96 FEB 14 1433 53.97 37 40.95 122 30.53 11.51 25 4 .07 .3 .5 SFP 1.4 96 FEB 14 1520 45.01 37 37.31 118 52.52 9.62 7 .11 .9 1.5 SMO 1.6 96 FEB 14 1658 32.82 37 37.79 118 52.20 7.60 7 .10 .8 1.2 SMO 1.1 96 FEB 14 1922 44.04 36 52.83 121 36.84 5.38 71 .18 .3 .5 SJB 2.9 96 FEB 14 2002 57.57 36 52.91 121 36.88 6.05 75 .16 .2 .4 SJB 3.1 96 FEB 14 2152 13.56 37 37.63 118 52.47 8.26 13 .10 .6 .7 SMO 1.7 96 FEB 14 2153 13.23 37 37.58 118 52.24 8.35 19 .25 .8 1.2 SMO 2.1 96 FEB 15 28 8.40 37 37.44 118 52.40 8.08 11 .04 .4 .5 SMO 2.1 96 FEB 15 39 13.29 37 37.41 118 52.23 8.75 10 .12 .7 1.0 SMO 1.4 96 FEB 15 58 57.51 37 37.19 118 52.73 8.93 12 .06 .4 .7 SMO 2.4 96 FEB 15 59 38.44 37 37.62 118 53.29 11.08 14 .08 .5 .6 SMO 2.0 96 FEB 15 102 3.79 37 37.26 118 52.61 8.64 14 .06 .5 .6 SMO 1.7 96 FEB 15 106 22.05 37 37.03 118 52.59 9.18 19 .07 .4 .6 SMO 2.6 96 FEB 15 107 4.92 37 36.84 118 53.09 10.67 10 .07 .5 1.5 SHE 2.1 96 FEB 15 108 4.47 37 36.52 118 52.62 9.24 11 .08 .6 .7 SHE 1.9 96 FEB 15 114 32.17 37 37.93 118 51.51 11.77 7 .08 .8 1.3 SMO 1.3 96 FEB 15 129 56.40 37 37.06 118 52.52 9.19 19 .08 .4 .6 SMO 2.4 96 FEB 15 143 33.92 37 37.07 118 52.63 9.10 10 .06 .6 .6 SMO 1.7 96 FEB 15 149 48.32 37 35.20 118 51.51 13.06 7 .07 .6 1.0 MOR 1.1 96 FEB 15 252 3.96 37 37.92 118 52.81 8.60 7 .12 .9 1.7 SMO 1.4 96 FEB 15 306 8.55 37 37.29 118 52.56 8.39 10 .05 .5 .6 SMO 1.8 96 FEB 15 312 56.44 37 37.26 118 52.60 8.61 13 .05 .4 .6 SMO 1.5 96 FEB 15 314 7.90 37 37.46 118 52.59 8.59 13 .06 .6 .7 SMO 1.9 96 FEB 15 315 15.00 37 37.27 118 52.54 8.15 8 .06 .5 .7 SMO 1.7 96 FEB 15 328 39.58 37 37.18 118 52.41 8.61 14 .07 .5 .6 SMO 1.8 96 FEB 15 503 18.13 37 37.18 118 52.37 9.34 10 .06 .6 .9 SMO 1.2 96 FEB 15 611 38.98 38 48.38 122 48.97 1.40 12 .04 .2 .5 GEY 1.8 96 FEB 15 614 25.51 37 36.90 118 52.11 9.88 9 .14 .6 1.0 SMO 1.2 96 FEB 15 629 36.56 37 38.87 118 50.85 3.56 7 .20 .9 .8 HCF 1.2 96 FEB 15 720 53.81 37 37.05 118 52.55 9.40 8 .05 .7 1.0 SMO 1.1 96 FEB 15 758 40.22 37 38.70 118 51.08 3.30 7 .19 .9 1.6 HCF 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 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 ------------------------------------------------------------------------------- FEB 04 001137.0 33.407N 141.268E 34* 4.2 1.0 28 OFF EAST COAST OF HONSHU, JAPAN 004649.7 22.078S 179.704W 541? 4.7 0.9 69 SOUTH OF FIJI ISLANDS 032900.9* 0.606N 120.283E 287? 4.0 1.3 20 MINAHASSA PENINSULA, SULAWESI 035515.8 45.472N 151.290E 44D 3.9 0.9 31 KURIL ISLANDS 121632.6* 29.777N 34.839E 10G 4.7 1.0 7 EGYPT. ML 4.1 (JER). 122027.9 35.760N 141.486E 10G 4.5 1.0 15 NEAR EAST COAST OF HONSHU, JAPAN 123534.2* 41.675N 142.778E 33N 4.2 0.8 19 HOKKAIDO, JAPAN REGION 125947.9* 18.765S 169.355E 271? 4.0 0.9 15 VANUATU ISLANDS 130754.8% 32.116S 71.153W 40G 0.3 9 NEAR COAST-CENTRAL CHILE. MD 3.7 133825.8 0.454N 126.287E 33N 4.6 1.3 26 NORTHERN MOLUCCA SEA 155250.0 31.699N 131.853E 39 4.2 1.2 34 KYUSHU, JAPAN 164522.8 64.335N 148.226W 10G 1.1 58 CENTRAL ALASKA. ML 4.2 173405.2& 64.250N 148.180W 7 46 CENTRAL ALASKA. . ML 3.1 173517.9? 10.44 S 124.28 E 33N 3.8 1.4 7 TIMOR REGION, INDONESIA 174714.7 60.514N 152.829W 10 2.8 0.9 83 SOUTHERN ALASKA. ML 3.5 183841.0% 14.721N 52.456E 22D 3.9 1.3 13 EASTERN GULF OF ADEN 190146.2 37.002N 4.171W 10G 0.9 12 SPAIN. mbLg 3.0 (MDD). 205037.8% 8.583N 137.984E 33N 4.0 0.4 11 WESTERN CAROLINE ISLANDS 223718.0% 33.097S 71.352W 45G 0.4 10 NEAR COAST-CENTRAL CHILE. MD 3.3 231545.9* 32.298S 179.590W 33N 4.7 1.1 16 SOUTH OF KERMADEC ISLANDS FEB 05 032610.5 26.998N 100.381E 10G 4.7 1.1 35 YUNNAN, CHINA 064525.2 43.804N 28.560W 10G 4.9 5.0 1.0 107 NORTHERN MID-ATLANTIC RIDGE 070351.8 53.645N 158.379E 150G 4.2 0.9 50 NEAR EAST COAST OF KAMCHATKA 084611.5* 2.312S 77.555W 33N 4.4 1.2 18 PERU-ECUADOR BORDER REGION 100029.0% 25.091N 123.920E 200G 3.7 0.6 14 NORTHEAST OF TAIWAN 121653.8? 19.48 N 96.25 E 33N 4.3 0.7 15 MYANMAR 130532.5& 63.650N 149.490W 129 2.8 80 CENTRAL ALASKA. . 151228.1 19.468N 64.331W 33N 4.1 1.1 25 VIRGIN ISLANDS 161953.0 43.483N 147.891E 33N 4.7 1.3 63 KURIL ISLANDS 162445.0? 32.21 S 178.20 W 33N 4.5 0.8 8 SOUTH OF KERMADEC ISLANDS 200213.1% 21.935N 122.663E 33N 3.8 0.7 10 TAIWAN REGION 200804.4* 48.963N 154.935E 33N 4.4 1.1 47 KURIL ISLANDS 234604.7* 27.097N 140.131E 400G 3.9 0.9 19 BONIN ISLANDS REGION FEB 06 024627.2 27.292N 100.515E 10G 4.5 1.1 27 YUNNAN, CHINA 053155.9 43.746N 128.156W 10G 3.3 0.7 52 OFF COAST OF OREGON 053959.5 43.105N 126.424W 10G 4.2 0.9 68 OFF COAST OF OREGON 071429.4* 6.582N 125.192E 212 4.3 0.9 29 MINDANAO, PHILIPPINE ISLANDS 073613.6 27.213N 100.404E 10G 5.2 4.9 0.7 85 YUNNAN, CHINA 084710.7 44.181N 151.016E 33N 4.5 1.1 36 EAST OF KURIL ISLANDS 105617.4 2.985S 138.801E 63* 4.9 1.1 32 IRIAN JAYA, INDONESIA 113022.9 62.140N 150.919W 63* 0.8 52 CENTRAL ALASKA 151650.6* 0.937N 119.989E 33N 4.7 1.1 16 MINAHASSA PENINSULA, SULAWESI 153116.4* 9.169S 158.432E 33N 3.5 0.8 11 SOLOMON ISLANDS 162859.0 4.308S 104.770E 200G 3.7 1.1 12 SOUTHERN SUMATERA, INDONESIA 175857.5 0.980N 120.121E 33N 5.2 4.7 1.3 36 MINAHASSA PENINSULA, SULAWESI 193031.2 32.000N 138.411E 340 3.7 0.9 20 SOUTH OF HONSHU, JAPAN 200857.4 27.260N 100.540E 10G 5.1 0.9 76 YUNNAN, CHINA 230834.1* 34.301N 25.682E 33N 3.4 1.2 16 CRETE FEB 07 003333.8 37.191N 77.825E 33N 3.9 1.3 15 SOUTHERN XINJIANG, CHINA 013317.9 35.915N 136.563E 33N 5.0 4.5 0.9 102 WESTERN HONSHU, JAPAN. Felt (IV JMA) at Kaga. 013727.7* 36.044N 139.886E 33N 0.9 6 EASTERN HONSHU, JAPAN 014259.0? 23.83 S 179.95 W 500G 4.1 1.4 9 SOUTH OF FIJI ISLANDS 025431.4 14.842S 177.339W 33N 4.7 4.9 0.8 41 FIJI ISLANDS REGION 035344.5* 27.740N 139.947E 493* 3.5 0.8 9 BONIN ISLANDS REGION 042051.8* 11.366S 119.098E 33N 4.2 1.3 15 SOUTH OF SUMBA, INDONESIA 050759.0 42.999N 103.152E 33N 4.6 0.9 35 MONGOLIA 063354.0* 24.081S 66.771W 200G 3.1 0.4 7 SALTA PROVINCE, ARGENTINA 071941.2 26.982N 100.437E 10G 4.7 1.2 34 YUNNAN, CHINA 090757.6* 1.153N 120.478E 33N 4.3 1.3 17 MINAHASSA PENINSULA, SULAWESI 092738.5? 4.88 S 150.19 E 33N 4.1 0.8 8 NEW BRITAIN REGION, P.N.G. 122705.9 38.495N 39.256E 10G 4.1 0.6 13 TURKEY 152923.8 27.133N 100.916E 10G 4.2 0.7 16 YUNNAN, CHINA 161248.5 4.875N 127.661E 159* 4.2 0.9 31 TALAUD ISLANDS, INDONESIA 211906.2 55.260N 156.473W 15 5.3 5.1 1.0 181 SOUTH OF ALASKA 212746.8 3.692N 122.413E 621 5.1 0.9 55 CELEBES SEA 215448.7* 45.372N 150.186E 33N 3.7 0.9 9 KURIL ISLANDS 225339.0 43.989N 149.401E 33N 4.9 1.2 75 EAST OF KURIL ISLANDS 231746.3* 20.705S 69.019W 100G 3.7 1.6 7 NORTHERN CHILE FEB 08 002040.5* 6.087S 147.313E 33N 4.2 0.9 11 EASTERN NEW GUINEA REG., P.N.G. 015029.8 43.418N 126.876W 10G 4.2 0.7 100 OFF COAST OF OREGON 045946.7 41.283N 140.085E 50* 4.1 1.0 26 HOKKAIDO, JAPAN REGION 051204.8 51.688N 16.288E 10G 0.7 11 POLAND 061911.1& 63.353N 131.297W 0 3.7 31 SOUTHERN YUKON TERRITORY, ML 4.7 063843.9* 13.598N 89.775W 99? 3.8 1.0 16 EL SALVADOR 064400.3* 51.879N 179.865W 33N 4.1 1.2 37 ANDREANOF ISLANDS, ALEUTIAN IS. 072503.4* 53.271N 143.317E 33N 3.6 0.8 12 SAKHALIN ISLAND 083953.3? 43.49 N 149.28 E 33N 3.9 1.3 11 EAST OF KURIL ISLANDS 094723.1 2.286N 126.586E 100G 4.8 1.2 34 NORTHERN MOLUCCA SEA 121724.9% 45.234N 149.923E 33N 3.6 0.8 12 KURIL ISLANDS. MD 3.4 (SAN). 133122.2 6.232S 154.816E 33N 4.9 0.8 44 SOLOMON ISLANDS 155408.0? 25.40 N 96.95 E 33N 4.2 1.2 9 MYANMAR 180113.9% 32.228S 70.589W 110G 0.2 10 CHILE-ARGENTINA BORDER. MD 3.6 182003.8% 33.139S 70.243W 5G 0.3 8 CHILE-ARGENTINA BORDER. MD 3.3 184723.8? 11.58 N 86.19 W 33N 3.6 1.4 7 NEAR COAST OF NICARAGUA 185913.5% 32.633S 70.388W 100G 0.2 10 CHILE-ARGENTINA BORDER. MD 3.6 213228.1* 44.180N 129.030W 10G 3.0 0.5 36 OFF COAST OF OREGON 213821.4 23.395N 94.773E 119D 5.0 0.6 14 MYANMAR-INDIA BORDER 220138.6* 7.061N 72.869W 33N 4.1 1.0 9 NORTHERN COLOMBIA 221135.6 0.674N 26.065W 10G 4.7 1.0 43 CENTRAL MID-ATLANTIC RIDGE 222801.6 38.372N 21.016E 39 4.2 1.2 63 GREECE. ML 4.6 (ROM). Felt at Mesolongion, Patrai, Pirgos and on Kefallinia and Zakinthos. 224640.3* 26.997N 100.410E 10G 4.4 1.2 23 YUNNAN, CHINA 235751.3 5.922N 125.872E 127* 4.7 0.9 26 MINDANAO, PHILIPPINE ISLANDS FEB 09 001802.0 38.299N 21.044E 33N 4.3 1.3 60 GREECE. ML 4.7 (JER). Felt at Mesolongion, Patrai, Pirgos and on Kefallinia and Zakinthos. 063333.5 44.044N 12.146E 10G 1.2 15 NORTHERN ITALY. ML 3.1 (ROM), 075502.8 6.354N 126.846E 211* 4.6 1.1 37 MINDANAO, PHILIPPINE ISLANDS 083015.0 18.032N 67.159W 10G 0.6 12 MONA PASSAGE. MD 3.6 (MPR). 085913.8 18.790N 65.491W 33N 3.8 1.4 15 PUERTO RICO REGION. MD 3.8 091630.5 44.614N 148.311E 33N 4.2 0.8 37 KURIL ISLANDS 113605.7 27.804N 130.229E 33N 3.9 0.8 19 RYUKYU ISLANDS 121411.9 34.383N 116.457W 5G 0.6 26 SOUTHERN CALIFORNIA. ML 3.7 (GS). Felt at Yucca Valley. 125255.0 45.146N 150.001E 33N 4.5 0.9 43 KURIL ISLANDS 173349.9* 5.855S 146.517E 33N 5.6 5.8 0.8 36 EASTERN NEW GUINEA REG., P.N.G. 201757.7 51.631N 16.347E 10G 0.7 14 POLAND. ML 2.5 (CLL). 224759.3 34.724N 32.251E 10G 4.3 0.8 34 CYPRUS REGION FEB 11 092849.8* 45.393N 150.501E 33N 5.1 0.5 42 KURIL ISLANDS 235101.8 52.063N 160.118E 33N 4.9 4.8 0.7 33 OFF EAST COAST OF KAMCHATKA FEB 12 025853.0* 45.158N 150.232E 33N 5.4 0.5 51 KURIL ISLANDS 090811.3 11.083S 118.826E 33N 5.7 5.7 1.2 16 SOUTH OF SUMBAWA, INDONESIA 103447.9 34.183N 117.629W 5G 0.8 41 SOUTHERN CALIFORNIA. ML 2.9 (GS). Felt at Upland. FEB 14 203105 Q 45.3 N 150.4 E 33N 5.9 0.6 119 KURIL ISLANDS 212656 Q 29.2 N 140.4 E 140 5.9 0.7 89 SOUTH OF HONSHU, JAPAN 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.