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 8 - 14, 1997 Stephen R. Walter U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 San Francisco Bay Area During the seven day period ending at midnight on Wednesday, May 14, 1997 the U.S. Geological Survey office in Menlo Park recorded 16 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Only two were as large as M2. This total compares to 25 earthquakes during the prior seven day period (May 1 - 7), four of which were as large as M2. On Saturday morning a M2.3 occurred on the southern Sargent fault about three miles southwest of Gilroy (#1/1). On Tuesday a M2.2 occurred near the San Andreas fault about two miles west of San Juan Bautista (#2/1). The only other earthquakes of note were a pair of M1.6's east of Vallejo and a M1.1 on the central San Gregorio fault about ten miles southwest of Woodside. Northern & Central California An interesting earthquake sequence occurred beneath the northern Sacramento Valley near Red Bluff. At noon on Saturday a M3.1 occurred at a depth of about 37 km, its epicenter located about three miles southwest of Red Bluff (#4/2). The quake was felt locally by a few people. The earthquake occurred much deeper than typical earthquakes in California, which generally are limited to depths of about 12 km. A search of the earthquake catalog shows a 39-km-deep event the same location back in September, 1984. Even deeper earthquakes occur in this part of the north Valley - some as deep as 87 km. These deep events are believed related to the subducting Gorda Plate which underthrusts much of northern California north and east of Cape Mendocino. Saturday's 37-km-deep event is too shallow to have occurred within this 'subduction zone'. Instead, its locations is closer to the base of the North American plate. An area northeast of Red Bluff was also active during the week, beginning with a M2.9 last Friday that was located about 20 miles east- northeast of Red Bluff (#2/2). Beginning on Monday an area 11 miles northeast of Red Bluff produced five M2 events over a two day period, the largest a M2.9 and all located at depths of about 11 to 12 km. In the middle of this a 28-km-deep M2.2 occurred Tuesday morning about 13 miles north of Red Bluff. To add to the story, a pair of deep earthquakes also occurred beneath the central Klamath Mountains northwest of Weaverville (#3/2). The first was a 33-km-deep M2.6 last Friday night that was located 21 miles northwest of Weaverville. It was followed Saturday afternoon by a 28-km- deep M2.8 located 30 miles northwest of the town. Both events occurred within the seismic zone that defines the down-going Gorda Plate. The Mendocino fracture zone was quiet during most of the week until a M3.1 occurred late Wednesday morning about 47 miles west of Petrolia (#9/2). Activity in the Coast Ranges was limited to a M2.1 on the central Maacama, a M2.1 southeast of Clear Lake, and four M2's at the Geysers geothermal area. Central California saw a pair of M2's on the creeping segment of the San Andreas (#7/2) and four M2's in the southern Diablo Range northwest and southeast of Coalinga (#5/2). The most active area along the eastern Sierra Nevada front was the Loyalton area north of Lake Tahoe where a M3.2 occurred early last Thursday morning (#1/2). It was followed by five M2 aftershocks over the following two days. Other events along the front included a M2.4 east of Markleeville (#6/2),a M2.6 nine miles southeast of Bridgeport (#8/2), and a M2.0 about six miles north of Bishop. Long Valley Caldera A trio of M2's occurred beneath the south side of the resurgent dome in the Long Valley caldera (#1/3). These are the first earthquakes as large as M2 to occur in the area of the resurgent dome since early July of last year. The only earthquake of note south of the caldera was a M2.3 near the Round Valley fault about 13 miles northwest of Bishop (#2/3). USA Seismicity (May 6 - 13) According to data provided by the National Earthquake Information Center, the largest earthquake in the country was a M4.8 in southern Alaska on Wednesday afternoon (#6/5). The temblor produced minor damage in Anchorage and was felt strongly at Butte, Eagle River, Kashwitna, Palmer, Soldotna, and Wasilla. Activity of note in the lower 48 states was limited to southern California where a M3.2 occurred last Thursday night in the Ridgecrest area (#1/4) and a M3.7 occurred Saturday afternoon north of Palm Springs (#2/4). The Planet Earth (May 6 - 13) A major earthquake occurred in eastern Iran about 65 miles north- northeast of Birjand early Saturday morning (#2/5). The M7.3 quake killed at least 1,560 people, injured over 4,400, and left 60,000 homeless. Extensive damage and landslides occurred in the Birjand-Qayen area. On Tuesday a M6.2 occurred in the Hindu Kush region along the northern Afghanistan/Pakistan border (#5/5). One person was killed, eleven injured, and homes were damaged in many parts of northern Pakistan and at Srinagar, Kashmir. The quake was felt as far as Delhi and Himachal Pradesh, India. At least 34 people were injured and five houses damaged by a M5.8 quake that stuck southern Kyushu Island Tuesday (#4/5). Landslides were reported in the Kagoshima Prefectures. Other earthquakes of note include a M5.5 in the Mariana Islands that was felt strongly on Guam (#1/5) and a M5.7 on the west Chile rise beneath the southeastern Pacific (#3/5). Table 1. Northern & Central California Seismicity (M>1.0) --ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH N N RMS ERH ERZ DUR YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 97 MAY 8 737 13.68 38 51.10 122 29.52 8.06 26 .09 .2 .5 GVL 2.1 97 MAY 8 822 41.98 39 34.75 120 7.72 4.89 7 2 .06 1.2 7.1 WAK - 3.2 97 MAY 8 911 49.68 38 51.05 122 29.44 8.25 24 .12 .2 .6 GVL 2.0 97 MAY 8 1027 15.95 38 49.21 122 47.88 4.11 23 .03 .2 .4 GEY 1.9 97 MAY 8 1035 34.10 38 48.42 122 48.29 2.95 21 .04 .2 .2 GEY 1.9 97 MAY 8 1055 15.47 37 22.53 118 47.88 10.73 23 .08 .4 1.7 KAI 1.9 97 MAY 8 1222 2.59 36 13.02 120 15.80 8.50 13 2 .02 .3 .7 COA 1.5 97 MAY 8 1225 40.36 37 26.43 118 36.30 2.74 10 1 .05 .3 4.2 RVL 1.3 97 MAY 8 1538 10.74 36 39.16 120 57.46 23.03 14 .25 2.1 2.0 ORT # 1.6 97 MAY 8 1605 6.03 39 14.32 122 47.80 9.04 25 1 .06 .2 .7 BAR 1.9 97 MAY 8 1629 54.58 36 39.92 121 4.48 12.21 14 .06 .9 1.2 PAN 1.0 97 MAY 8 1711 18.00 36 39.01 121 5.27 9.12 14 1 .08 .7 1.1 PAN 1.0 97 MAY 8 1726 26.18 36 38.78 121 4.70 12.19 13 .06 .9 1.1 PAN 1.9 97 MAY 8 1757 28.52 36 38.43 121 5.79 10.38 29 3 .15 .3 .8 BVL 1.6 97 MAY 8 2104 26.19 39 35.21 120 9.70 3.18 34 1 .11 .9 2.0 WAK 2.9 97 MAY 8 2134 59.52 39 33.74 120 12.87 14.18 24 .08 1.8 1.9 WAK 2.8 97 MAY 8 2309 8.24 38 49.03 122 47.04 2.34 8 .02 .4 .5 GEY 1.6 97 MAY 9 252 52.65 37 38.21 118 52.09 9.20 18 2 .03 .3 .6 SMO 1.6 97 MAY 9 341 10.49 37 38.04 118 52.28 8.16 10 .07 .6 .5 SMO 1.2 97 MAY 9 413 0.69 39 36.07 120 9.19 8.43 19 4 .21 .9 2.7 WAK 2.3 97 MAY 9 520 2.80 38 46.61 122 42.97 2.60 11 .05 .3 .4 GEY 1.4 97 MAY 9 622 50.85 38 47.76 122 48.89 4.58 28 .03 .2 .3 GEY 1.8 97 MAY 9 624 31.66 38 47.84 122 48.88 4.36 14 .02 .2 .6 GEY 1.5 97 MAY 9 632 51.17 38 56.38 123 3.46 3.18 27 .05 .2 1.5 MAA 1.9 97 MAY 9 703 19.86 38 48.24 122 48.86 4.33 7 .01 .4 .9 GEY 1.0 97 MAY 9 716 10.19 38 48.72 122 48.60 4.43 11 .01 .3 .7 GEY 1.4 97 MAY 9 725 38.46 36 11.66 120 20.20 13.39 29 1 .05 .2 .3 COA 2.0 97 MAY 9 733 48.50 38 21.00 122 37.93 6.56 28 2 .08 .2 .4 ROG 2.1 97 MAY 9 914 11.07 36 11.90 120 20.95 13.42 25 1 .05 .4 .5 COA 1.9 97 MAY 9 915 39.96 37 38.26 118 51.82 10.06 7 .01 1.2 1.2 SMO 1.1 97 MAY 9 949 40.55 37 38.44 118 52.23 10.54 7 .01 1.1 1.6 SMO 1.0 97 MAY 9 1118 1.03 37 34.74 118 50.47 10.32 10 .03 1.2 1.6 MOR 1.2 97 MAY 9 1151 37.69 39 36.69 123 25.74 8.15 11 .03 .3 .5 MAA 1.3 97 MAY 9 1208 34.57 37 34.72 121 40.91 4.73 14 1 .05 .3 .3 HAM 1.2 97 MAY 9 1218 23.53 36 4.45 121 34.46 4.69 17 1 .04 .5 1.2 SUR 1.1 97 MAY 9 2109 24.05 38 47.16 122 45.57 1.82 10 1 .02 .2 .7 GEY 1.4 97 MAY 9 2119 11.86 38 47.21 122 45.57 1.88 9 1 .01 .2 .7 GEY 1.4 97 MAY 9 2151 13.93 39 35.24 123 22.53 7.93 9 .03 .4 1.3 MAA 1.2 97 MAY 9 2156 57.29 39 36.17 120 9.88 3.18 13 2 .13 1.3 9.6 WAK 2.4 97 MAY 9 2229 37.92 37 26.16 118 52.76 6.37 17 .05 .4 2.0 MOR 1.5 97 MAY 9 2322 43.96 38 48.58 122 47.84 2.34 38 .06 .1 .2 GEY 2.6 97 MAY 9 2353 8.30 40 16.49 121 52.37 7.58 28 .18 .3 2.0 SHA 2.9 97 MAY 10 29 31.37 40 17.76 121 52.28 8.06 13 2 .06 .4 1.7 SHA 1.9 97 MAY 10 152 42.29 37 28.84 121 34.25 6.35 12 .04 .3 .9 HAM 1.4 97 MAY 10 324 9.58 38 3.80 118 44.36 5.02 17 1 .09 .5 2.7 MOL 1.7 --ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH N N RMS ERH ERZ DUR YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 97 MAY 10 450 39.89 40 52.30 123 17.65 33.30 24 2 .08 .3 .9 KLA 2.6 97 MAY 10 811 6.76 38 44.87 122 42.82 0.21 20 .07 .2 .5 NAP 2.1 97 MAY 10 950 45.18 36 30.18 120 59.32 4.79 14 1 .12 .4 1.4 CRV 1.2 97 MAY 10 1049 27.92 38 47.89 122 48.26 2.73 29 .04 .2 .3 GEY 1.6 97 MAY 10 1058 40.47 39 22.35 123 16.81 7.70 25 .04 .2 .6 MAA 2.1 97 MAY 10 1202 44.33 39 33.20 120 12.70 18.70 14 .06 3.0 1.7 WAK 2.5 97 MAY 10 1339 54.64 36 46.81 121 16.67 10.56 48 1 .04 .1 .2 PAI 1.7 97 MAY 10 1347 14.10 37 30.36 118 51.48 6.58 27 2 .04 .3 .4 MOR 1.9 97 MAY 10 1532 31.49 36 57.66 121 35.47 4.28 60 1 .11 .1 .3 SAR 2.3 97 MAY 10 1610 37.94 35 49.67 118 25.79 12.26 10 .02 .6 .9 WWF 1.9 97 MAY 10 1610 37.95 35 49.40 118 25.71 12.66 10 .04 .7 .9 WWF 1.9 97 MAY 10 1822 14.84 38 47.12 122 46.61 4.00 9 .00 .3 .8 GEY 1.4 97 MAY 10 1900 31.00 40 9.28 122 16.93 36.65 18 .22 .5 1.2 KLA 3.1 97 MAY 10 2208 57.68 40 55.44 123 26.94 28.36 24 2 .08 .3 1.0 KLA 2.8 97 MAY 11 136 59.31 38 48.72 122 48.88 3.81 8 .01 .4 .6 GEY 1.2 97 MAY 11 300 56.82 37 38.82 118 53.96 5.30 25 .07 .2 .3 SMO 2.0 97 MAY 11 445 16.20 38 48.46 122 45.36 1.13 9 .02 .3 .7 GEY 1.4 97 MAY 11 520 48.99 37 39.20 118 53.80 6.84 8 .03 .6 .8 DOM 1.2 97 MAY 11 934 27.92 38 46.96 122 45.78 2.58 11 .02 .2 .6 GEY 1.4 97 MAY 11 1017 49.94 36 4.06 120 9.45 3.02 29 .07 .3 .6 COA 2.2 97 MAY 11 1052 38.36 39 4.51 122 23.00 0.03 12 .05 .4 3.8 SAC # 1.5 97 MAY 11 1147 26.67 38 48.59 122 48.05 2.01 18 .02 .2 .2 GEY 1.7 97 MAY 11 1237 37.47 36 30.19 120 59.52 5.97 33 .13 .2 1.0 BIT 1.9 97 MAY 11 1245 0.49 37 18.56 122 21.85 5.84 9 .03 .6 .6 ANN 1.1 97 MAY 11 1312 19.50 38 32.79 122 45.61 7.20 36 .07 .2 .4 ROG 1.9 97 MAY 11 1409 20.47 38 2.86 118 44.28 5.72 11 1 .03 1.4 4.1 MOL 2.1 97 MAY 11 1658 39.69 38 47.49 122 48.29 4.43 12 .02 .2 .6 GEY 1.4 97 MAY 11 1745 1.12 36 49.26 121 32.42 6.60 22 .06 .2 .5 SJB 1.1 97 MAY 11 1848 12.97 37 16.08 118 38.96 7.21 11 1 .07 .7 2.3 KAI 1.5 97 MAY 11 2225 52.69 38 51.62 122 48.18 0.61 9 1 .03 .3 .6 GEY 1.2 97 MAY 11 2344 34.82 38 47.69 122 46.79 2.78 19 .05 .2 .4 GEY 1.8 97 MAY 12 18 7.91 39 27.01 123 18.49 7.67 13 1 .04 .2 .4 MAA 1.4 97 MAY 12 21 7.66 36 29.95 120 59.55 2.06 12 1 .07 .4 .8 BIT 1.6 97 MAY 12 128 49.27 38 49.93 122 52.91 2.19 8 .02 .3 1.1 GEY 1.2 97 MAY 12 200 57.35 37 39.09 118 53.80 4.68 22 .07 .3 .4 DOM 2.1 97 MAY 12 216 28.89 38 46.99 122 45.74 2.24 7 .02 .3 .8 GEY 1.2 97 MAY 12 217 42.64 37 39.39 118 53.43 5.56 13 .04 .3 .8 DOM 1.4 97 MAY 12 241 48.57 39 39.00 121 4.08 9.86 7 .03 4.0 3.0 WAK 1.3 97 MAY 12 245 56.27 37 39.39 118 53.42 5.95 16 .04 .3 .5 DOM 1.7 97 MAY 12 322 28.44 39 5.00 122 22.46 0.03 16 .21 1.8 5.4 SAC # 1.8 97 MAY 12 322 28.85 39 4.97 122 23.08 3.91 11 .06 1.4 2.1 SAC 1.6 97 MAY 12 503 14.47 36 33.20 121 8.46 4.12 27 .04 .2 .6 PIN 1.7 97 MAY 12 612 17.34 38 45.44 122 42.75 2.90 13 .05 .3 .3 GEY 1.6 97 MAY 12 729 55.55 37 33.22 118 50.05 7.33 12 .03 .4 .8 MOR 1.0 97 MAY 12 750 7.90 37 20.94 121 42.88 7.74 51 2 .04 .1 .3 ALU 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 97 MAY 12 846 23.36 39 43.11 123 30.60 9.53 10 .03 .3 .9 MAA 1.3 97 MAY 12 903 55.84 38 42.42 119 39.79 0.04 18 2 .06 .9 .7 WAK # 2.4 97 MAY 12 1117 43.75 36 58.94 121 38.02 4.80 44 .08 .1 .3 SAR 1.5 97 MAY 12 1241 44.07 37 39.32 118 53.66 5.11 16 .04 .3 .4 DOM 1.6 97 MAY 12 1733 53.81 37 5.12 121 55.28 17.95 13 .14 .8 2.3 LOM 1.2 97 MAY 12 1808 36.22 36 23.17 119 56.84 0.46 7 .27 2.116.0 JQN # 1.1 97 MAY 12 2238 5.74 37 39.38 118 53.63 5.63 11 1 .04 .6 .6 DOM 1.3 97 MAY 12 2309 42.57 40 17.95 122 4.91 10.66 15 1 .13 .5 1.3 SHA 2.9 97 MAY 12 2312 2.73 40 19.18 122 5.17 6.44 15 2 .08 .4 1.3 SHA 1.8 97 MAY 13 7 38.94 40 18.98 122 5.20 7.31 9 1 .06 .6 1.5 SHA 1.6 97 MAY 13 356 46.50 38 49.02 122 48.51 4.38 43 1 .04 .1 .3 GEY 2.8 97 MAY 13 520 32.80 40 17.30 122 4.48 11.92 17 2 .08 .4 .7 SHA 2.5 97 MAY 13 631 45.15 36 2.72 120 35.57 3.59 9 1 .02 .5 .8 SLA 1.2 97 MAY 13 824 23.96 40 17.77 122 5.18 12.47 14 1 .09 .4 1.1 SHA 2.7 97 MAY 13 1003 49.59 40 17.79 122 3.58 8.08 7 .05 .5 1.1 SHA 1.4 97 MAY 13 1507 58.15 37 40.00 118 51.54 5.45 7 .02 .9 2.9 DOM 1.1 97 MAY 13 1551 24.88 36 30.14 120 59.36 5.25 29 2 .11 .2 .7 CRV 1.8 97 MAY 13 1603 8.54 40 22.21 122 12.41 28.27 9 .16 1.3 1.0 SHA 2.2 97 MAY 13 1840 15.80 36 23.40 120 56.29 2.04 7 .03 .4 1.7 BIT 1.4 97 MAY 13 2004 50.57 36 16.94 120 27.37 10.71 33 .10 .2 .4 COA 2.9 97 MAY 13 2017 20.38 38 6.21 122 11.96 5.87 7 .08 .4 .7 NAP 1.6 97 MAY 13 2147 33.52 38 47.64 122 48.30 4.25 7 .01 .3 .7 GEY 1.2 97 MAY 13 2200 11.90 40 17.58 122 5.60 13.34 13 .12 .4 1.2 SHA 2.1 97 MAY 14 40 25.50 37 26.66 118 22.73 28.33 14 .68 3.4 8.9 CHV 2.0 97 MAY 14 657 37.97 37 39.00 118 53.91 5.08 24 .08 .3 .4 SMO 2.5 97 MAY 14 658 6.36 37 39.03 118 53.42 3.90 7 .02 .9 3.7 DOM 1.4 97 MAY 14 956 42.59 37 39.08 118 53.53 4.97 15 .06 .3 .5 DOM 1.6 97 MAY 14 1001 23.59 38 6.26 122 12.22 6.53 8 .11 .6 1.1 NAP 1.6 97 MAY 14 1027 58.57 36 27.13 121 3.32 4.84 52 .16 .2 .9 BIT 2.8 97 MAY 14 1113 34.38 37 38.95 118 53.91 5.04 24 .08 .3 .4 SMO 2.6 97 MAY 14 1130 34.54 36 51.04 121 34.63 6.53 46 .08 .2 .4 SJB 2.2 97 MAY 14 1222 42.48 38 12.36 119 4.94 15.84 12 .13 .7 1.6 MOL 2.6 97 MAY 14 1227 9.43 37 39.30 118 53.51 5.24 8 .04 .9 .9 DOM 1.2 97 MAY 14 1242 23.96 36 27.18 121 2.93 4.67 15 .09 .5 1.3 BIT 1.6 97 MAY 14 1304 0.98 38 49.43 122 47.79 3.89 7 .01 .5 .8 GEY 1.0 97 MAY 14 1358 8.65 36 3.93 120 8.92 4.50 21 .20 .7 1.0 COA 2.5 97 MAY 14 1429 8.71 37 39.12 118 53.49 5.15 11 .07 .4 .7 DOM 1.2 97 MAY 14 1622 49.03 37 39.77 121 44.89 3.96 11 .07 .3 .5 GRN 1.6 97 MAY 14 1633 14.63 40 18.82 122 4.32 7.16 16 .21 .6 2.4 SHA 2.2 97 MAY 14 1651 59.82 37 27.19 118 35.81 11.95 24 .06 .3 .8 RVL 2.3 97 MAY 14 1715 28.86 36 27.10 121 3.26 4.02 37 .12 .3 1.1 BIT 2.3 97 MAY 14 1825 11.55 40 25.59 125 10.17 1.25 29 .34 4.212.4 MEN 3.3 97 MAY 14 2250 26.26 36 34.95 121 11.92 5.94 13 .06 .3 .8 PIN 1.8 97 MAY 14 2342 46.02 36 40.35 121 19.02 2.56 14 .08 .3 .6 STN 1.5 97 MAY 15 29 38.92 37 39.52 121 44.51 4.20 24 .09 .2 .4 GRN 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 97 MAY 15 122 16.56 37 2.28 121 47.24 7.02 9 .03 .4 .6 LOM 1.4 97 MAY 15 203 20.53 40 17.76 121 52.43 12.39 10 .13 .6 2.6 SHA 1.7 97 MAY 15 318 57.23 40 16.98 121 52.48 7.51 13 .23 .6 4.2 SHA 1.7 97 MAY 15 325 33.23 37 39.06 118 53.53 5.09 15 .07 .3 .6 DOM 1.4 97 MAY 15 402 45.65 36 29.07 121 4.15 5.23 13 .08 .4 .9 BIT 1.8 97 MAY 15 617 28.75 35 59.37 120 32.79 5.13 19 .05 .3 .4 MID 2.0 97 MAY 15 634 1.11 38 47.15 122 45.25 2.73 27 .06 .2 .6 GEY 2.2 TABLE 2. Data from National Earthquake Information Center (NEIC) UTC TIME LAT LONG DEP GS MAGS SD STA REGION AND COMMENTS HRMNSEC MB Msz USED ------------------------------------------------------------------------------ MAY 06 012139.5 6.085N 126.773E 33N 5.2 1.1 37 MINDANAO, PHILIPPINE ISLANDS 024938.6? 32.10 S 70.06 W 120G 0.2 9 CHILE-ARGENTINA BORDER. MD 3.3 MAY 07 012853.2? 19.32 N 66.80 W 33N 0.9 9 PUERTO RICO REGION 021543.2 10.564S 75.376W 33N 5.0 4.0 0.8 59 CENTRAL PERU 025549.1 36.933N 3.986W 10G 0.9 10 STRAIT OF GIBRALTAR. mbLg 2.6 045827.1* 42.790N 12.643E 5G 1.8 16 CENTRAL ITALY. ML 2.9 (VIE). 084336.0 62.224N 150.308W 17 1.1 50 CENTRAL ALASKA 130130.0 11.053N 60.946W 5G 0.4 6 WINDWARD ISLANDS. MD 2.6 (TRN). 161647.4 40.393N 51.537E 53D 5.3 0.8 110 CASPIAN SEA 171921.1& 63.280N 149.790W 97 54 CENTRAL ALASKA. . 184431.9% 33.448S 70.268W 100G 0.3 11 CHILE-ARGENTINA BORDER. MD 4.1 200857.1? 32.37 S 70.38 W 100G 0.2 10 CHILE-ARGENTINA BORDER. MD 3.4 MAY 08 045427.8 11.472N 85.898W 200G 4.5 1.0 25 NICARAGUA 055610.5 19.313S 175.947W 218D 4.9 0.8 57 TONGA ISLANDS 060709.2 51.522N 159.600E 33N 5.1 4.8 1.1 64 OFF EAST COAST OF KAMCHATKA 065256.8? 43.12 N 126.21 W 10G 0.4 12 OFF COAST OF OREGON 065904.0 35.720N 117.623W 5G 0.7 25 CENTRAL CALIFORNIA. ML 3.2 102745.1? 31.67 S 69.74 W 140G 0.1 9 SAN JUAN PROV., ARGENTINA. MD 3.7 152420.8? 32.52 S 71.83 W 15G 0.4 9 NEAR COAST-CENTRAL CHILE. MD 3.8 155826.7 17.476N 100.092W 33N 4.9 4.2 1.0 55 GUERRERO, MEXICO. Felt at Mexico City. 200302.3? 39.65 N 73.60 E 70G 4.6 0.8 8 TAJIKISTAN-XINJIANG BORDER REG. 234946.0* 19.220N 106.867W 33N 4.4 4.0 1.0 44 OFF COAST OF JALISCO, MEXICO MAY 09 013246.7* 24.017S 66.723W 194D 4.9 0.9 54 SALTA PROV, ARGENTINA 042635.5 37.072N 4.063W 33N 1.1 28 SPAIN. mbLg 4.0 (MDD). 063104.6 44.746S 117.773E 10G 5.2 5.1 1.1 29 SOUTH OF AUSTRALIA 083322.6 13.966N 92.371W 33N 4.7 4.5 0.8 50 OFF COAST OF CHIAPAS, MEXICO 090626.6? 14.35 N 92.46 W 33N 4.7 4.6 0.8 37 NEAR COAST OF CHIAPAS, MEXICO 090637.5 13.274N 144.706E 29G 6.1 5.5 0.7 79 MARIANA ISLANDS. Mw 6.0 Felt strongly on Guam. 102541.3* 51.501N 173.525W 33N 4.7 0.9 22 ANDREANOF ISLANDS, ALEUTIAN IS. 163014.5 33.167S 70.284W 5G 0.4 10 CHILE-ARGENTINA BORDER. MD 3.7 172257.0 35.763N 140.644E 33N 4.9 0.8 28 NEAR EAST COAST OF HONSHU, JAPAN 184101.5* 35.481N 27.690E 33N 4.8 1.0 15 DODECANESE ISLANDS 211825.8 33.146S 70.241W 5G 0.4 8 CHILE-ARGENTINA BORDER. MD 3.3 MAY 10 043934.0* 43.667N 146.374E 33N 4.6 1.1 38 KURIL ISLANDS 061221.9* 19.049N 107.150W 33N 4.4 4.1 0.9 43 OFF COAST OF JALISCO, MEXICO 075733.4 33.859N 59.752E 33N 6.3 7.3 1.0 125 NORTHERN IRAN. Mw 7.1 (GS), 7.2 At least 1,560 people killed, 4,460 injured, 60,000 homeless, extensive damage and landslides in the Birjand-Qayen area. Five people killed and some damage in the Herat area, Afghanistan. Felt in the Kerman, Khorasan, Semnan, Sistan va Baluchestan and Yazd regions of Iran. 102724.1* 33.708N 59.886E 33N 4.6 0.7 10 NORTHERN IRAN 174322.1* 6.847S 105.888E 33N 4.8 1.0 19 SUNDA STRAIT 185352.9* 3.206S 101.502E 33N 5.5 5.2 1.1 30 SOUTHERN SUMATERA, INDONESIA 230146.8 28.221N 34.772E 10G 4.7 0.6 22 EGYPT. ML 5.3 (JER). MAY 11 001627.2 33.974N 116.699W 10G 0.8 35 SOUTHERN CALIFORNIA. ML 3.7 080612.3* 18.667N 107.242W 33N 3.8 0.9 14 OFF COAST OF JALISCO, MEXICO 132049.8* 5.580N 72.587W 33N 4.7 0.6 30 COLOMBIA 154924.5 24.652S 66.852W 192D 4.9 1.1 77 SALTA PROV, ARGENTINA 171815.2 61.637N 150.045W 33N 1.1 10 SOUTHERN ALASKA. ML 4.0 (PMR). Felt at Anchorage, Eagle River, Houston and Palmer. 181659.7 6.656N 73.088W 170D 4.8 0.7 68 NORTHERN COLOMBIA. Felt in Santader Province. Also felt at Bogota. 214620.5* 51.706N 179.386W 33N 4.5 1.1 36 ANDREANOF ISLANDS, ALEUTIAN IS. 221615.4 36.106S 97.265W 10G 5.6 5.7 1.1 68 WEST CHILE RISE. Mw 6.4 (GS), 225938.2 37.102N 140.923E 48D 5.3 0.7 88 EASTERN HONSHU, JAPAN MAY 12 134526.0* 10.170N 121.574E 33N 5.6 5.8 0.7 21 PANAY, PHILIPPINE ISLANDS. 135015.8 42.784N 12.528E 10G 4.5 1.1 47 CENTRAL ITALY. Felt strongly at Assisi, Orvieto, Perugia, Terni, Todi and Spoleto. 150302.8 18.671N 107.175W 33N 5.4 4.8 0.8 98 OFF COAST OF JALISCO, MEXICO 190022.0* 51.363S 139.636E 10G 5.1 5.1 1.2 14 SOUTH OF AUSTRALIA 225731.2* 14.108N 91.887W 33N 4.5 0.9 36 GUATEMALA MAY 13 035646.2 38.816N 122.717W 5G 0.7 10 NORTHERN CALIFORNIA. ML 2.8 053830.5 31.905N 130.187E 33N 5.5 5.8 1.2 94 KYUSHU, JAPAN. Mw 6.1 At least 34 people injured, five houses damaged, damage (VI JMA) in the Sendai area. Landslides in the Kagoshima Prefectures. 141346.0 36.544N 70.978E 195D 6.2 0.8 187 HINDU KUSH REGION, AFGHANISTAN. One person killed in the Malakand area, Pakistan; 11 people injured at Kabul, Afghanistan. Houses damaged in many parts of northern Pakistan and at Srinagar, Kashmir. Felt strongly throughout northeastern Afghanista, northern Pakistan and Tajikistan. Felt as far as Delhi and Himachal Pradesh, India. 231103.7 61.152N 150.939W 62D 4.8 1.2 51 SOUTHERN ALASKA. Minor damage at Anchorage. Felt strongly at Butte, Eagle River, Kashwitna, Palmer, Soldotna and Wasilla. 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.