Seismicity Report for Northern California, the Nation, and the World for the week of March 2 - 8, 1995 Data and text prepared by Steve Walter and Barry Hirshorn U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 Graphics by Quentin Lindh NOTICE: Next week's report will come one day early and will cover the 6-day period from March 9 - 14. San Francisco Bay Area Another fairly quiet week in the Bay Area. During the seven-day period ending at midnight on Wednesday, March 8, 1995 the U.S. Geological Survey office in Menlo Park recorded 26 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Only four of these were as large as M2.0. This total compares to 28 earthquakes during the previous seven-day period (February 23 - March 1) four of which were as large as M2. Both the creeping segment of the San Andreas and the central Calaveras fault were active at the M2 level this week. Two M2 events occurred along the San Andreas south of San Juan Bautista last Thursday and Saturday (#1 & #2 in figure 1). Then on Tuesday morning a M3.1 occurred along the Calaveras about nine miles north of Morgan Hill (#3/1). It was followed an hour later by a M2.7 farther north along the Calaveras about nine miles southeast of Milpitas (#4/1). The only other earthquakes of note during the week were a M1.6 on the central Hayward fault beneath northeastern San Leandro and a M1.6 beneath Alamo, near the southern end of the Concord fault. Northern & Central California The region was relatively quiet during the past week with most of the earthquake activity located in the northern Coast Ranges and offshore of Cape Mendocino. The southeast Clear Lake area, site of a M4.0 on February 28, experienced five aftershocks as large as M2.0 (#1/2). The Bartlett Springs fault north of Clear Lake also became active last Thursday/Friday with four M2 earthquakes (#2/2). The Mendocino fracture zone again was the most seismically active region in the state with six earthquakes as large as M3.0. The most active area was about 75 miles offshore of Cape Mendocino, close to the epicenter of a M6.6 quake that rocked the north state on February 18 (#3/2). A M3.1 occurred 50 miles west of the Cape Saturday afternoon (#6/2) and a M3.3 occurred later that night just eleven miles west of Petrolia (#7/2). Onshore activity was limited to a pair of M2 events southeast of Eureka (#4/2). With focal depths over 20 kilometers these were likely related to movements within the down-going Gorda Plate. Long Valley Caldera A pair of M4 earthquakes occurred just south of the rim of the caldera and about a mile east of Convict Lake (#1/3). The earthquakes occurred Saturday afternoon and evening and were felt in Mammoth Lakes and Bishop. Activity began with a M4.4 just after 4:00pm. It was followed 25 minutes lager by a M2.0 aftershock. The second M4 event occur just before 7:00pm and was followed five minutes later by a M2.8 and a M3.8 aftershock. The M4 events are the largest earthquakes in the Long Valley area since a M4.5 occurred near Red Slate Mountain on August 10, 1993. USA Seismicity (February 27 - March 8) The National Earthquake Information Center reported several notable earthquakes in the lower 48 states outside of California. Perhaps the most intriguing was a M3.0 in northern New York state, about 15 miles west of Lake Placid (#2/4). Occasional small (M<4) earthquakes have been observed in the Lake Placid area in the past two decades, part of a broad swath of seismicity that extends from southern New Jersey north along the Hudson River Valley and into eastern Ontario and southern Quebec. This zone includes a number of moderate-sized earthquakes, including a M5.9 that struck the Massena, NY area in September, 1944. Activity in the west was a bit more prosaic with ongoing activity in the Soda Springs area of southeastern Idaho (#3/4) and a M3.5 in the Basin & Range terrane of western Nevada (#4/4). Southern California was reasonably quiet with only one earthquake large enough to get people's attention: a M3.7 offshore of Santa Monica that was felt in western Los Angeles (#1/4). The Planet Earth (February 27 - March 8) A relatively small earthquake turned out to be quite destructive. A Mb4.5 event occurred along the Colombia-Equador border last Saturday, killing at least seven people and damaging many homes in the Colombian city of Pasto (#3/5). A slightly larger earthquake occurred near the southwestern coast of Turkey but apparently produced no injury or damage (#5/5). It was widely felt in the Dodecanese Islands of Kalimnos, Kos, and Rodhos, as well as in the Mugla area of Turkey. The largest earthquake of the week was a Ms6.2 that occurred east of the Leeward Islands (#6/5). Again, no damage was reported though the earthquake was felt on the islands of Guadeloupe, Martinique, St. Lucia, and Dominica. Other events of note include a Mb4.3 in the northern Yukon Territory (#1/5), a Ms5.7 in the Samoa Islands region (#2/5), and a Ms5.8 near the east coast of Borneo in the Celebes Sea (#5/5). 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 95 MAR 2 912 6.36 36 54.66 121 38.24 5.56 25 .10 .3 .5 SJB 1.3 95 MAR 2 914 22.32 36 54.48 121 38.30 5.31 28 .14 .3 .5 SJB .9 95 MAR 2 914 33.24 36 54.55 121 38.33 4.78 26 .14 .3 .6 SJB 1.0 95 MAR 2 1057 59.37 39 7.66 122 51.11 6.08 10 .07 .4 .6 BAR 1.4 95 MAR 2 1106 24.24 36 33.20 121 3.38 7.09 21 .11 .3 1.0 BVL 2.0 95 MAR 2 1110 5.68 38 55.35 122 38.84 0.83 31 .21 .5 3.0 KON 2.5 95 MAR 2 1111 3.59 38 56.38 122 38.32 4.31 15 .17 .6 1.0 KON 1.6 95 MAR 2 1122 16.26 38 56.05 122 40.05 4.34 8 .06 .4 .6 KON 1.6 95 MAR 2 1127 19.72 38 56.27 122 37.32 4.41 8 .08 .6 1.1 BAR 1.4 95 MAR 2 1307 4.63 37 44.51 122 8.48 4.80 48 5 .13 .2 .3 HAY 1.6 95 MAR 2 1312 2.08 38 56.30 122 38.82 4.21 11 .17 .7 1.0 KON 1.4 95 MAR 2 1349 44.26 38 56.27 122 37.79 4.54 7 .06 .6 .9 KON 1.4 95 MAR 2 1401 10.78 38 56.42 122 38.51 5.03 34 .25 .4 1.0 KON 2.7 95 MAR 2 1406 8.24 38 56.38 122 37.52 4.31 7 .06 .6 1.0 BAR 1.5 95 MAR 2 1410 12.69 38 56.34 122 37.53 4.29 7 .06 .6 1.0 BAR 1.5 95 MAR 2 1430 53.20 38 56.21 122 36.91 4.97 12 1 .11 .5 1.4 BAR 1.6 95 MAR 2 1445 11.72 38 56.43 122 37.93 4.26 9 .05 .4 .6 KON 1.5 95 MAR 2 1457 12.21 38 56.35 122 37.50 4.63 13 .09 .4 .8 BAR 1.9 95 MAR 2 1539 51.84 38 48.61 118 33.79 0.05 29 .29 2.6 4.1 NEV * 2.6 95 MAR 2 1712 6.29 38 56.18 122 35.61 0.37 10 1 .14 .7 1.4 BAR- 1.5 95 MAR 2 1717 6.82 38 56.72 122 38.72 3.48 15 1 .14 .4 .6 KON- 1.6 95 MAR 2 1757 58.66 40 36.86 125 32.12 2.31 12 1 .2415.910.6 DEL - 2.2 95 MAR 2 1822 2.77 36 49.81 121 33.57 6.36 71 4 .21 .3 .4 SJB 2.6 95 MAR 2 1830 39.32 38 47.50 122 46.47 2.61 15 .13 .4 .9 GEY 1.8 95 MAR 2 1831 11.93 38 47.57 122 46.57 2.32 17 .11 .3 .6 GEY 1.5 95 MAR 2 2009 42.07 38 56.26 122 37.41 4.87 27 .12 .3 .7 BAR 2.3 95 MAR 2 2042 45.97 38 56.46 122 37.32 4.29 11 .09 .5 1.3 BAR 1.5 95 MAR 2 2049 49.79 37 38.38 119 1.69 4.50 12 1 .03 .4 .8 MAM .7 95 MAR 2 2143 8.62 38 45.19 122 42.38 2.45 7 .03 .4 .6 NAP 1.3 95 MAR 2 2143 27.31 38 56.49 122 37.26 4.68 10 .07 .5 .8 BAR 1.4 95 MAR 2 2236 4.50 40 32.21 125 39.22 8.35 13 1 .2313.012.6 MEN - 2.4 95 MAR 2 2343 21.83 39 4.16 122 33.63 0.16 11 .31 .8 5.3 BAR 1.4 95 MAR 3 43 45.13 38 56.31 122 37.28 4.79 8 .06 .6 .9 BAR- 1.4 95 MAR 3 113 9.27 39 4.81 122 26.37 16.57 7 1 .25 2.5 3.2 SAC 1.8 95 MAR 3 156 44.74 36 18.90 120 53.82 4.44 18 2 .10 .3 .6 BIT 1.6 95 MAR 3 228 19.65 36 31.58 121 6.80 3.46 9 1 .04 .5 1.1 PIN 1.2 95 MAR 3 325 49.96 36 31.12 121 6.22 4.80 14 1 .06 .3 .7 PIN 1.2 95 MAR 3 328 15.63 39 17.68 122 52.67 0.08 23 1 .15 .4 1.8 BAR 2.0 95 MAR 3 439 40.58 39 17.44 122 45.40 0.02 13 2 .23 .6 2.0 BAR * 1.4 95 MAR 3 445 47.35 39 17.53 122 45.10 14.31 9 2 .03 .5 1.0 BAR 1.5 95 MAR 3 446 20.15 39 17.68 122 45.28 11.87 9 2 .08 .5 1.3 BAR 1.3 95 MAR 3 452 43.15 39 17.41 122 45.68 0.16 34 2 .25 .5 2.1 BAR 2.3 95 MAR 3 500 20.11 39 17.30 122 45.15 11.83 47 3 .22 .3 .9 BAR 2.6 95 MAR 3 514 40.95 40 14.36 124 8.91 11.32 13 2 .11 .5 .6 MEN 1.6 95 MAR 3 516 40.92 39 17.38 122 45.06 15.00 9 2 .09 .6 1.4 BAR 1.8 95 MAR 3 622 26.82 39 17.33 122 44.97 12.91 30 2 .16 .3 .9 BAR 2.2 95 MAR 3 623 3.80 39 17.40 122 45.28 11.64 14 .06 .3 1.2 BAR 1.9 95 MAR 3 938 49.19 37 17.32 121 39.98 3.86 25 2 .05 .2 .6 SFL 1.2 95 MAR 3 948 52.89 38 56.28 122 39.17 4.69 9 .08 .5 .6 KON- 1.4 95 MAR 3 1008 4.41 39 34.18 123 21.15 10.35 10 .06 .5 1.0 MAA 1.4 95 MAR 3 1119 37.85 37 36.20 119 0.44 4.15 9 1 .02 1.0 .7 MAM 1.0 95 MAR 3 1230 15.85 37 17.36 121 40.20 3.67 69 2 .10 .2 .4 SFL 1.8 95 MAR 3 1241 2.92 38 55.85 122 39.57 4.11 11 1 .16 .7 .8 KON 1.6 95 MAR 3 1259 38.52 37 18.38 121 35.97 7.68 44 2 .07 .2 .4 SFL 1.4 95 MAR 3 1313 52.36 37 36.11 119 0.49 4.77 17 2 .07 .5 .6 MAM 1.6 95 MAR 3 1329 38.51 36 34.60 121 2.10 8.93 32 2 .16 .4 .7 PAN 1.2 95 MAR 3 1343 45.02 38 56.08 122 37.59 4.99 34 1 .15 .3 .7 KON 2.5 95 MAR 3 1418 22.51 37 17.55 121 40.41 2.13 29 2 .06 .2 .5 SFL 1.3 95 MAR 3 1636 23.66 39 18.51 123 16.89 0.02 12 .09 .4 2.8 MAA * 1.7 95 MAR 3 1723 52.62 39 17.25 122 45.21 12.64 25 .13 .3 1.1 BAR 2.5 95 MAR 3 1739 52.37 37 7.98 121 31.81 7.41 11 .03 .3 .8 CYN 1.1 95 MAR 3 1819 4.57 37 35.55 119 0.52 4.02 9 .03 1.2 .9 SIL 1.2 95 MAR 3 1820 10.41 37 25.27 119 1.53 7.53 8 2 .10 1.5 9.5 SIL - 1.3 95 MAR 3 1829 44.99 36 16.71 120 26.69 11.10 12 .08 .5 .9 COA 1.6 95 MAR 3 1920 10.88 37 18.61 121 40.77 6.92 16 1 .05 .3 1.1 SFL 1.0 95 MAR 3 2116 28.23 37 17.69 121 40.50 2.03 11 .05 .5 .7 SFL .9 95 MAR 3 2151 35.36 38 45.13 122 41.88 2.53 7 .03 .4 .8 NAP 1.3 95 MAR 4 38 51.79 40 17.51 124 33.50 17.72 8 1 .04 1.3 .9 MEN 1.8 95 MAR 4 42 43.82 38 56.46 122 37.12 4.34 9 .09 .5 1.1 BAR 1.4 95 MAR 4 205 15.41 40 38.59 125 43.83 23.70 35 1 .20 3.314.8 DEL - 3.6 95 MAR 4 207 16.52 40 39.71 125 41.44 21.61 23 2 .21 6.412.8 DEL - 3.2 95 MAR 4 257 18.23 36 34.72 121 1.87 8.50 16 .12 .5 1.1 PAN .9 95 MAR 4 321 3.29 38 56.40 122 37.23 2.96 29 .17 .3 1.0 BAR 2.4 95 MAR 4 321 44.84 38 56.30 122 38.35 4.41 7 .05 1.1 .6 KON 1.0 95 MAR 4 339 19.99 37 32.44 121 54.92 5.32 10 .04 .4 .7 MIS 1.0 95 MAR 4 347 3.51 37 35.72 119 0.77 4.93 10 .06 1.2 .6 SIL 1.4 95 MAR 4 426 42.88 38 56.49 122 37.22 5.00 8 .06 .5 1.0 BAR 1.4 95 MAR 4 447 41.73 38 55.97 122 37.24 5.13 9 1 .11 .7 1.1 BAR 1.3 95 MAR 4 848 55.05 40 18.47 124 31.05 0.02 8 2 .16 1.9 2.0 MEN * 1.8 95 MAR 4 1011 21.09 40 19.18 125 7.98 22.14 13 1 .23 5.013.9 MEN - 2.8 95 MAR 4 1017 52.60 37 19.93 121 41.98 7.66 16 .06 .3 .6 SFL .8 95 MAR 4 1023 22.54 37 19.93 121 41.77 7.41 26 .08 .3 .6 SFL 1.0 95 MAR 4 1026 30.38 36 2.16 121 34.09 5.70 21 3 .11 .6 1.8 SUR 1.6 95 MAR 4 1211 1.01 37 39.93 118 50.68 4.27 19 .17 .6 .8 HCF 1.6 95 MAR 4 1253 14.41 37 39.95 118 50.55 3.67 28 2 .08 .3 .4 HCF 2.0 95 MAR 4 1300 9.75 37 34.33 118 51.38 8.73 23 6 .10 .4 .6 MOR 1.4 95 MAR 4 1307 45.03 37 39.93 118 50.55 1.53 8 .07 .4 .6 HCF 1.4 95 MAR 4 1540 40.19 40 34.48 123 48.90 23.73 26 3 .15 .3 .9 EUR 2.7 95 MAR 4 1604 6.84 38 52.53 122 43.24 2.27 12 .06 .3 .4 KON 1.8 95 MAR 4 1619 56.22 36 46.87 121 29.11 5.49 79 4 .23 .3 .5 SJB 2.8 95 MAR 4 1622 10.02 40 43.56 125 40.50 15.79 20 2 .17 7.5 9.8 PON - 2.8 95 MAR 4 1715 54.96 39 33.39 118 7.74 0.04 28 1 .56 6.2 3.8 NEV * 3.3 95 MAR 4 1828 12.32 38 56.42 122 37.91 3.88 11 .12 .6 1.1 KON 1.4 95 MAR 4 1921 37.37 36 17.75 120 52.35 5.25 14 1 .10 .4 .7 BIT 1.5 95 MAR 4 2054 32.98 38 45.58 119 40.16 1.88 14 1 .07 .8 6.5 WAK 2.4 95 MAR 4 2108 33.10 40 22.88 125 22.44 22.88 23 1 .25 5.217.0 MEN - 3.2 95 MAR 4 2135 38.92 37 31.17 118 45.20 2.60 15 2 .13 .5 3.7 WCN * 1.2 95 MAR 4 2146 29.34 38 56.37 122 37.14 4.73 17 .12 .5 1.0 BAR 1.9 95 MAR 4 2151 8.03 40 42.02 125 37.74 8.27 23 1 .14 4.9 5.1 DEL 3.3 95 MAR 4 2151 40.92 40 40.97 125 35.54 6.11 17 1 .15 6.2 5.8 DEL 3.4 95 MAR 4 2205 5.26 37 40.13 118 50.47 2.83 15 .10 .4 .9 HCF 1.4 95 MAR 4 2209 49.43 38 47.39 122 46.65 4.96 16 .10 .3 .7 GEY 1.6 95 MAR 5 7 3.06 37 35.81 118 50.13 11.06 34 .11 .3 .5 MOR 4.3 95 MAR 5 12 47.86 37 37.01 118 49.15 12.20 8 .09 1.5 3.0 HCF 1.4 95 MAR 5 26 11.84 37 36.16 118 49.71 10.31 19 2 .08 .4 .4 SMO 1.7 95 MAR 5 27 52.75 37 35.99 118 49.92 10.79 18 1 .09 .5 .6 MOR 1.5 95 MAR 5 32 50.34 37 36.30 118 49.76 10.05 16 .09 .4 .9 SMO 2.0 95 MAR 5 38 44.93 37 36.20 118 50.42 10.29 25 .10 .5 .6 SMO 2.1 95 MAR 5 102 50.25 37 37.07 118 49.95 10.19 12 .05 .5 .7 HCF 1.1 95 MAR 5 109 2.76 37 36.20 118 49.81 10.72 18 .07 .4 .8 SMO 1.6 95 MAR 5 131 4.62 36 22.79 120 57.21 9.36 13 3 .12 .5 1.4 BIT 1.2 95 MAR 5 248 47.36 37 35.45 118 50.16 11.41 37 1 .12 .3 .6 MOR 4.1 95 MAR 5 253 4.66 37 35.49 118 50.44 12.01 34 1 .11 .3 .5 MOR 3.6 95 MAR 5 253 8.29 37 35.59 118 50.65 14.16 29 1 .12 .3 .7 MOR 3.6 95 MAR 5 341 6.02 37 35.99 118 49.90 10.30 22 .09 .4 .7 MOR 1.7 95 MAR 5 355 14.17 37 36.06 118 50.47 11.39 11 .16 .8 1.4 SMO 1.5 95 MAR 5 412 15.68 37 35.53 118 49.60 10.98 17 1 .10 .4 .9 MOR 1.4 95 MAR 5 415 23.69 37 35.67 118 49.99 10.86 9 .12 .6 1.5 MOR 1.2 95 MAR 5 450 7.85 38 56.31 122 38.41 4.94 35 .26 .4 .9 KON 2.4 95 MAR 5 517 26.01 40 18.28 124 29.85 8.19 20 2 .10 .9 .4 MEN 3.3 95 MAR 5 527 47.42 36 12.14 120 44.96 9.45 11 2 .10 .4 1.1 BIT 1.5 95 MAR 5 542 20.02 38 55.90 122 39.49 5.13 17 .14 .4 .7 KON 1.8 95 MAR 5 545 4.85 40 18.65 124 29.09 8.02 16 2 .07 .9 .4 MEN 2.2 95 MAR 5 620 47.00 37 35.34 118 50.08 11.34 21 .09 .4 .8 MOR 2.0 95 MAR 5 649 57.64 38 55.97 122 36.95 5.34 43 .16 .3 .8 BAR 2.9 95 MAR 5 655 56.97 40 18.28 124 25.58 9.72 15 1 .10 .9 .5 MEN 2.0 95 MAR 5 710 7.03 37 37.82 118 50.46 11.03 8 2 .07 1.8 1.1 HCF .9 95 MAR 5 721 43.32 38 56.07 122 39.15 4.77 14 .15 .6 .9 KON 1.6 95 MAR 5 754 1.88 37 35.31 118 50.17 11.68 19 .11 .5 .9 MOR 1.5 95 MAR 5 758 13.03 38 56.16 122 40.56 3.10 9 .10 .5 .5 KON 1.4 95 MAR 5 934 44.72 37 35.37 118 49.05 9.88 25 .09 .4 .7 MOR 2.1 95 MAR 5 957 23.44 37 36.68 118 49.93 10.70 10 .06 .7 1.0 HCF 1.1 95 MAR 5 1127 54.71 36 13.15 120 46.17 8.14 10 1 .07 .4 1.2 BIT 1.4 95 MAR 5 1301 30.73 37 35.81 118 49.91 10.58 19 .09 .4 .8 MOR 1.4 95 MAR 5 1314 47.07 38 46.70 119 42.50 0.87 13 2 .11 .9 5.7 WAK * 2.5 95 MAR 5 1326 35.32 37 36.20 118 49.83 10.71 16 .08 .4 .7 SMO 1.3 95 MAR 5 1459 15.14 40 18.41 124 29.35 7.84 12 1 .06 .9 .6 MEN 1.7 95 MAR 5 1548 31.24 37 35.98 118 49.45 11.04 17 .10 .5 1.0 MOR 1.6 95 MAR 5 1702 7.49 37 36.50 118 49.87 10.68 19 2 .09 .4 .5 SMO 1.4 95 MAR 5 2030 12.55 38 55.15 122 37.26 5.40 7 2 .14 2.0 .9 KON 1.1 95 MAR 5 2046 10.69 40 18.46 124 31.55 9.41 13 1 .10 1.2 .6 MEN 2.0 95 MAR 5 2054 58.94 39 22.63 119 58.78 10.37 12 1 .12 1.9 2.9 WAK 1.8 95 MAR 5 2131 47.17 40 18.50 124 29.26 7.88 18 1 .10 1.1 .5 MEN 2.6 95 MAR 5 2150 36.28 37 9.19 121 30.61 4.10 47 1 .10 .2 .5 CYN 1.3 95 MAR 5 2203 56.36 37 51.64 121 59.91 4.73 19 2 .14 .3 .5 CON 1.3 95 MAR 5 2209 23.96 40 39.11 125 27.32 18.02 12 .14 9.914.0 DEL - 2.5 95 MAR 5 2233 2.99 38 55.99 122 41.90 0.99 16 .11 .3 .7 KON 1.8 95 MAR 5 2351 2.26 37 34.71 118 51.82 5.47 18 .05 .4 .6 MOR 1.2 95 MAR 6 350 13.61 38 56.17 122 37.46 3.95 7 .07 .5 1.0 BAR 1.2 95 MAR 6 405 27.44 38 56.08 122 37.86 4.67 14 .14 .6 1.0 KON 1.5 95 MAR 6 428 39.20 38 55.93 122 37.08 4.62 8 1 .11 .8 1.2 BAR 1.2 95 MAR 6 536 47.11 38 56.43 122 37.11 4.95 8 .06 .5 .8 BAR 1.3 95 MAR 6 615 7.43 38 56.02 122 36.89 4.65 11 1 .15 .6 1.5 BAR 1.5 95 MAR 6 630 46.48 36 44.16 121 19.74 8.19 60 3 .11 .2 .4 PAI 1.9 95 MAR 6 641 13.51 38 56.28 122 38.81 4.45 12 .22 .7 1.3 KON 1.5 95 MAR 6 709 49.24 39 17.96 123 14.76 0.47 13 2 .08 .3 1.0 MAA 1.2 95 MAR 6 1153 53.44 36 16.79 120 27.83 7.90 11 1 .10 .4 .9 COA 1.4 95 MAR 6 1154 24.35 36 37.76 121 14.26 4.49 37 1 .11 .2 .6 STN 1.8 95 MAR 6 1228 11.40 38 56.51 122 36.99 4.41 9 .07 .4 .9 BAR 1.4 95 MAR 6 1300 54.22 37 36.03 118 50.09 11.94 18 2 .12 .5 .7 SMO 1.1 95 MAR 6 1428 3.65 36 44.09 121 19.63 7.77 12 .04 .3 .7 PAI .9 95 MAR 6 1919 37.05 36 36.21 121 12.77 9.50 49 2 .08 .2 .4 PIN 2.1 95 MAR 6 1929 13.87 37 21.65 121 43.37 6.65 9 .03 .4 .8 ALU .9 95 MAR 6 2001 25.76 40 34.42 125 41.76 15.17 23 1 .2310.513.8 MEN - 2.6 95 MAR 6 2037 11.62 37 35.97 119 0.54 4.26 9 .02 .6 .9 SIL 1.0 95 MAR 6 2042 2.78 39 42.41 123 29.50 0.05 15 3 .15 .3 1.9 MAA * 1.4 95 MAR 7 229 30.13 40 23.74 125 10.03 14.57 14 2 .22 9.111.5 MEN - 2.2 95 MAR 7 1003 34.41 37 35.74 118 50.19 12.05 23 .12 .4 .8 MOR 1.4 95 MAR 7 1003 54.01 37 33.80 118 29.14 9.99 18 .08 .3 1.0 CHV 1.9 95 MAR 7 1150 8.81 37 25.83 121 40.66 6.57 8 .02 .3 1.0 HAM 1.5 95 MAR 7 1253 11.79 40 18.01 124 25.25 8.26 18 2 .06 .6 .4 MEN 2.2 95 MAR 7 1316 6.44 38 47.34 122 46.34 0.70 12 .06 .3 .7 GEY 1.6 95 MAR 7 1319 41.95 37 17.40 121 40.11 3.62 27 2 .07 .2 .5 SFL 1.3 95 MAR 7 1356 34.50 39 51.15 123 30.37 8.02 7 .05 .5 .7 MAA .7 95 MAR 7 1405 41.95 37 6.82 121 49.77 4.32 44 1 .10 .2 .3 LOM 2.0 95 MAR 7 1551 44.31 35 48.88 120 32.84 9.83 21 4 .08 .3 1.1 ROB 1.5 95 MAR 7 1815 33.98 37 15.50 121 38.32 6.66120 2 .10 .1 .3 SFL 3.1 95 MAR 7 1854 44.44 37 34.09 118 29.08 9.21 7 .01 .7 1.7 CHV 1.3 95 MAR 7 1944 23.05 36 34.27 121 7.27 10.12 18 .06 .3 .7 BVL 1.6 95 MAR 8 16 33.42 40 41.36 123 58.38 21.17 21 2 .12 .4 .3 EUR 2.8 95 MAR 8 757 3.13 36 2.63 121 34.24 8.43 19 2 .10 .6 5.4 SUR 1.5 95 MAR 8 1916 30.56 37 23.37 121 44.70 7.31 85 2 .13 .2 .5 ALU 2.8 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 27 040443.2 32.780S 70.324W 100G 3.8 0.3 12 CHILE-ARGENTINA BORDER 045049.4? 13.12 N 89.57 W 33N 3.5 0.1 9 EL SALVADOR Felt (III) at San Salvador. 124644.5% 46.360N 7.247E 5G 2.9 0.8 15 SWITZERLAND 132900.3 52.801N 34.739W 10G 4.9 4.2 0.9 55 NORTH ATLANTIC OCEAN 173204.0 47.855N 7.783E 10G 2.4 1.0 8 SWITZERLAND 174000.2? 12.32 N 81.48 W 33N 4.3 0.7 15 CARIBBEAN SEA 174524.1% 48.192N 0.519W 5G 2.0 0.4 5 FRANCE 224655.2% 34.323S 71.072W 60G 3.5 0.7 10 NEAR COAST-CENTRAL CHILE FEB 28 001422.1* 44.580N 146.436E 33N 4.6 0.5 20 KURIL ISLANDS 012505.8% 34.060S 69.971W 5G 3.6 0.3 10 CHILE-ARGENTINA BORDER 032529.9% 33.643S 70.326W 100G 3.7 0.2 10 CHILE-ARGENTINA BORDER 035942.8% 43.155N 0.030E 5G 3.3 0.9 16 FRANCE 050447.8* 7.333N 35.895W 10G 4.7 0.7 28 CENTRAL MID-ATLANTIC RIDGE 055232.4% 34.060S 69.933W 5G 3.5 0.5 10 CHILE-ARGENTINA BORDER 061216.9* 2.492N 122.092E 629* 4.9 0.9 11 CELEBES SEA 102409.9* 38.131N 73.093E 87? 4.2 0.9 15 TAJIKISTAN-XINJIANG BORDER REG. 134502.3? 31.96 S 70.00 W 140G 3.8 0.4 9 CHILE-ARGENTINA BORDER MAR 01 104957.8? 50.19 N 129.10 W 10G 3.9 1.9 9 VANCOUVER ISLAND REGION 105535.4 40.599N 125.669W 10G 4.5 0.9 137 OFF COAST-NOR.CALIFORNIA 121105.1 61.334N 149.785W 57* 2.6 0.6 16 SOUTHERN ALASKA 125214.5* 14.939N 93.792W 33N 4.4 0.8 18 NEAR COAST CHIAPAS, MEXICO 135350.5& 40.443N 124.740W 13 3.1 25 NEAR COAST OF NOR. CALIF 145416.8? 51.92 N 179.94 E 168* 4.1 1.2 15 RAT ISLANDS, ALEUTIAN IS 150511.2& 40.425N 124.760W 13 3.4 28 NEAR COAST OF NOR.CALIF 155635.7& 33.745N 118.614W 14 3.7 45 SOUTHERN CALIFORNIA 3.7 (PAS). Felt in the South Bay and western part of Los Angeles. First of two events about 20 seconds apart. 160700.3 65.890N 135.164W 20G 4.3 1.0 49 NORTHERN YUKON TERRITORY, CANADA. ML 5.0 (PGC), 4.9 (AEIC). 170534.3 56.140N 162.211W 171 4.2 1.0 28 BRISTOL BAY 200932.3 52.714N 34.836W 10G 5.0 4.8 0.9 61 NORTH ATLANTIC OCEAN 211604.3? 34.74 S 71.19 W 70G 2.3 0.9 11 NEAR COAST-CENTRAL CHILE 233003.8 61.962N 150.213W 33N 3.3 1.3 14 SOUTHERN ALASKA MAR 02 010432.8 47.316N 9.958E 10G 2.4 0.8 11 GERMANY 013705.1? 11.12 N 61.99 W 90G 2.9 0.3 6 WINDWARD ISLANDS 022528.4* 51.574N 15.965E 10G 3.6 0.6 10 POLAND. ML 3.6 (GRF) 051358.9& 33.743N 117.498W 11 2.5 27 SOUTHERN CALIFORNIA. 2.5 (PAS). ML 2.5 (GS). Felt. 051453.8 17.637N 119.492E 33N 4.7 0.7 22 PHILIPPINE ISLANDS REGION 053351.4& 44.233N 74.426W 4 3.0 17 NEW YORK. 085628.1* 52.840N 34.392W 10G 4.3 0.7 14 NORTH ATLANTIC OCEAN 111005.0 38.902N 122.601W 5G 2.5 0.8 18 NOR.CALIFORNIA (GS). Felt at Clearlake. 131845.8& 60.070N 153.320W 128 3.3 60 SOUTHERN ALASKA 140109.1 39.022N 122.601W 5G 2.5 1.1 23 NOR.CALIFORNIA (GS). Felt at Clearlake. 160302.8 26.055S 179.556E 500G 4.8 1.0 45 SOUTH OF FIJI ISLANDS 175250.9* 5.170S 151.844E 113? 4.8 1.1 24 NEW BRITAIN REGION, P.N.G. 201852.0& 61.920N 148.680W 38 2.6 36 SOUTHERN ALASKA 205004.0& 32.833N 118.424W 6G 3.2 7 OFF COAST OF CALIFORNIA 231931.9? 39.83 N 143.68 E 33N 4.0 1.0 9 OFF E COAST OF HONSHU,JAPAN MAR 03 010751.1 42.570N 111.179W 5G 3.0 0.9 12 EASTERN IDAHO 012014.8 42.577N 111.138W 5G 2.4 0.7 11 EASTERN IDAHO 030801.5* 36.325N 140.691E 101* 3.9 0.8 15 NEAR E CST OF HONSHU, JAPAN 033710.8 42.542N 111.165W 5G 2.5 0.8 12 EASTERN IDAHO 044024.2* 27.423S 113.120W 10G 5.0 0.8 26 EASTER ISLAND REGION 114605.2 6.508S 154.882E 70G 5.4 5.4 0.7 61 SOLOMON ISLANDS 120214.6 6.447S 154.886E 70G 5.9 5.6 0.7 96 SOLOMON ISLANDS 132709.8* 84.826N 96.068E 10G 5.0 1.1 31 NORTH OF SEVERNAYA ZEMLYA 133048.9* 85.421N 92.825E 10G 4.9 0.9 23 NORTH OF SEVERNAYA ZEMLYA 194232.1% 33.152S 70.311W 5G 3.6 0.3 7 CHILE-ARGENTINA BORDER 211239.2* 14.560S 175.681W 33N 5.6 5.7 0.7 68 SAMOA ISLANDS REGION 222651.0* 4.808S 151.758E 111D 5.2 1.0 31 NEW BRITAIN REGION, P.N.G. MAR 04 010922.1? 31.86 S 70.88 W 100G 3.4 0.3 10 CHILE-ARGENTINA BORDER 020516.0* 40.601N 125.546W 25G 3.2 0.7 25 OFF COAST-NOR.CALI 085017.3* 33.581S 68.318W 5G 4.2 0.6 13 MENDOZA PROV. ARGENTINA 141147.8* 39.922N 143.108E 33N 4.9 1.0 22 OFF E COAST OF HONSHU,JAPAN 153407.5% 33.941S 70.507W 100G 2.2 0.1 7 CHILE-ARGENTINA BORDER 161955.9 36.753N 121.510W 5G 2.9 0.8 35 CENTRAL CALIFORNIA 171554.6 39.548N 118.098W 5G 3.5 0.7 19 NEVADA 175637.4* 14.211S 14.462W 10G 5.5 5.0 0.9 20 SOUTHERN MID-ATLANTIC RIDGE 215142.5 40.588N 125.522W 25G 3.2 0.7 34 OFF COAST-NOR.CALIFORNIA 232344.4? 0.72 N 77.93 W 33N 4.5 0.8 11 COLOMBIA-ECUADOR BORDER. At least seven people were killed and many houses damaged in the Pasto area, Colombia. MAR 05 000703.2 37.620N 118.809W 5G 3.8 0.8 108 CALIFORNIA-NEVADA BORDER. ML 4.5 (GS), 4.5 (BRK). MD 4.2 (GM). Felt in Inyo County, California. 024847.4 37.591N 118.797W 5G 3.4 0.8 95 CALIFORNIA-NEVADA BORDER. ML 4.3 (GS), 4.4 (BRK). MD 4.1 (GM). 025308.8 37.575N 118.824W 5G 3.6 0.7 63 CALIFORNIA-NEVADA BORDER. ML 3.5 (GS), 3.6 (BRK). MD 3.6 (GM). This event was preceded by a small foreshock 3.5 seconds earlier. 051721.7 40.281N 124.828W 10G 3.5 0.8 29 NEAR COAST OF NOR.CALIF 064957.2 38.947N 122.543W 5G 3.1 0.8 33 NOR.CALIFORNIA 101414.1% 34.360S 71.109W 70G 3.3 0.2 11 NEAR COAST-CENTRAL CHILE 111049.3* 18.006S 169.489E 100G 5.3 0.9 40 VANUATU ISLANDS MAR 06 184342.1* 2.581N 118.238E 33N 5.5 5.8 1.1 14 CELEBES SEA 184400.8 15.505N 92.037W 170D 5.0 1.0 57 MEXICO-GUATEMALA BORDER MAR 07 035813.7 36.743N 27.852E 33N 5.1 0.5 29 DODECANESE ISLANDS (JER), 4.5 (THE). MD 4.7 (ISK). Felt on Kalimnos, Kos and Rodhos. Also felt in the Mugla area, Turkey. 111049.9* 25.498S 179.462E 500G 4.7 0.9 29 SOUTH OF FIJI ISLANDS 181533.8 37.279N 121.638W 5G 3.2 0.9 57 CENTRAL CALIFORNIA MAR 08 034602.2 16.598N 59.510W 33N 6.1 6.2 0.7 106 LEEWARD ISLANDS. Felt (IV) on Guadeloupe; (III) on Martinique and St. Lucia. Also felt on Dominica. Note: Computer users can get faster acces 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.