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 March 21 - 27, 1996 Stephen R. Walter U.S. Geological Survey 345 Middlefield Rd. MS-977, Menlo Park, CA 94025 San Francisco Bay Area Activity remained fairly light throughout most of the Bay Area. During the seven-day period ending at midnight on Wednesday, March 27, 1996 the U.S. Geological Survey office in Menlo Park recorded 19 earthquakes of magnitude one (M1) and greater within the San Francisco Bay area shown in Figure 1. Six were as large as M2. This total compares to 32 earthquakes during the previous seven-day period (March 14 - 20 ), eleven of which were as large as M2.0. Most notable was a M2.6 early Monday morning beneath the San Andreas reservoir west of Burlingame (#3/1). Located on or near the San Andreas fault, the earthquake was felt by residents of the central Peninsula from Moss Beach to western Burlingame. It was preceded by a M1.3 earthquake late Sunday afternoon. Other M2 events included a M2.2 on the San Gregorio fault near Ano Nuevo (#4/1), a pair of M2's on the central Calaveras east of San Jose (#2/1), and a pair of M2's on the creeping segment of the San Andreas about 12 miles southeast of Hollister (#1/1). Northern & Central California The past week was relatively quiet with no earthquakes as large as M3, with the exception of one M3.2 in the Long Valley caldera (see below). Cape Mendocino experienced only one earthquake as large as M2 (#7/2) and the Coast Range was nearly as quiet except for the normal number of M2's at the Geysers geothermal area. Perhaps the most active area was near Lassen Peak where a couple of M2 earthquakes occurred near the town of Viola, northwest of Lassen Peak (#4/2) and two M2's occurred west of Lake Almanor, southeast of the peak (#2/2). Activity in the central state was limited to a pair of M2's on the southern creeping segment of the San Andreas (#1/2), a M2.0 northwest of Los Banos (#3/2), and a M2.4 about 23 miles northwest of Coalinga (#9/2). Long Valley Caldera The caldera was quiet during most of the week until Wednesday when a M3.2 earthquake occurred beneath the landing strip alongside Highway 395 (#1/3). This quake was felt by residents of Mammoth Lake and was followed by several M2 aftershocks. Earlier that day a M2.1 occurred just southeast of Mammoth Lakes but probably was not felt (#4/3). USA Seismicity (March 19 - 28) The National Earthquake Information Center reported several domestic earthquakes worth mentioning. On Friday a M3.5 earthquake occurred in eastern Massachusetts that produced no damage but was felt locally and in parts of Rhode Island (#1/4). On Sunday two M3 earthquakes were felt in the Corona area of central New Mexico (#2/4). Finally, two M3.5 earthquakes occurred on Monday, the first in the Texas Panhandle region (#3/4), the second in eastern Mississippi near the town of Quitman (#4/4). The latter earthquake was felt at Quitman and throughout much of Clarke County. The Planet Earth (March 19 - 28) The largest earthquake on the planet during the week was a Ms6.6 event in the central Aleutian Islands that was felt on Adak Island (#1/5). It was followed by numerous aftershocks, at least four of which were as large as M5. Other earthquakes of note include a Ms5.8 off the north Island of New Zealand (#3/5), a Mb5.5 near the coast of Oaxaca, Mexico (#4/5), a Mb5.6 near the coast of Nicaragua (#5/5), and a Mb5.7 beneath the Arabian Sea east of Somalia (#6/5). Table 1. Northern & Central California Seismicity (M>1.0) --ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH N N RMS ERH ERZ DUR YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 96 MAR 21 908 53.84 36 45.65 121 11.11 6.72 16 .06 .3 1.1 QUI 1.0 96 MAR 21 1124 22.17 36 6.20 120 38.81 4.84 10 .07 .6 .8 SLA 1.1 96 MAR 21 1154 5.74 36 28.61 121 3.08 5.49 28 .05 .3 .5 BIT 1.7 96 MAR 21 1624 49.28 38 47.60 122 44.87 2.16 34 1 .07 .1 .4 GEY 2.4 96 MAR 21 1709 41.80 38 47.04 122 45.64 2.71 19 .06 .2 .6 GEY 1.8 96 MAR 21 1743 48.87 38 47.89 122 44.75 1.30 8 .03 .3 .9 GEY 1.6 96 MAR 21 1918 52.71 35 34.78 120 7.53 12.68 7 .05 .5 1.0 SIM 1.4 96 MAR 21 1931 54.09 36 3.38 120 36.57 4.76 29 .10 .3 .4 SLA 1.9 96 MAR 21 2153 21.79 37 38.09 118 56.83 8.93 9 .07 .5 1.1 SMO 1.5 96 MAR 21 2229 7.45 36 41.67 121 19.32 4.35 63 1 .09 .1 .3 STN 3.3 96 MAR 21 2322 54.46 37 38.15 118 56.23 10.44 12 .06 .5 1.0 SMO 1.2 96 MAR 21 2329 52.37 36 41.27 121 18.87 4.13 42 .10 .2 .5 STN 2.4 96 MAR 21 2331 56.57 38 47.65 122 44.73 0.91 13 .07 .3 .8 GEY 1.8 96 MAR 21 2342 32.75 36 34.15 121 8.19 4.77 7 .02 .4 1.4 PIN 1.2 96 MAR 22 31 35.05 38 47.40 122 45.42 1.64 10 .04 .3 .6 GEY 1.5 96 MAR 22 46 14.30 36 1.43 120 34.35 5.49 38 .08 .3 .3 SLA 2.6 96 MAR 22 102 24.16 36 1.37 120 34.34 7.18 10 .15 1.3 1.2 SLA 1.2 96 MAR 22 224 0.53 36 9.26 120 16.06 9.79 13 .07 .4 1.0 COA 1.4 96 MAR 22 304 26.84 38 54.91 122 41.20 2.52 8 .09 .5 .9 KON 1.7 96 MAR 22 308 14.55 37 29.51 118 52.71 5.11 8 .05 1.3 7.1 MOR - 1.1 96 MAR 22 517 46.46 38 48.25 122 45.07 0.90 9 .04 .3 .8 GEY 1.6 96 MAR 22 905 19.45 37 30.53 118 50.09 7.78 14 .07 .4 1.3 MOR 1.6 96 MAR 22 1003 17.57 36 1.66 120 34.14 5.13 12 .09 .5 .5 SLA 1.4 96 MAR 22 1057 51.09 37 8.46 121 32.17 8.10 19 .04 .3 .7 CYN 1.2 96 MAR 22 1322 23.25 40 38.35 124 0.77 18.41 11 .03 .4 .5 EUR 1.8 96 MAR 22 1351 19.97 38 46.94 122 45.69 2.68 10 .03 .3 .8 GEY 1.4 96 MAR 22 1531 57.67 40 6.40 121 33.15 16.38 21 1 .09 .7 .6 ALM * 2.6 96 MAR 22 1808 51.62 37 10.77 121 4.24 1.25 36 .42 .7 9.3 JQN * 2.0 96 MAR 22 2026 12.59 40 32.53 121 38.72 12.17 8 .04 .5 .6 SHA 2.6 96 MAR 22 2039 22.68 38 47.49 122 46.71 1.26 13 .08 .3 .6 GEY 2.2 96 MAR 22 2148 58.06 36 33.98 121 9.75 3.82 7 .02 .4 .6 PIN 1.1 96 MAR 23 143 50.41 37 5.30 121 30.30 7.41 16 .05 .3 .6 CYS 1.3 96 MAR 23 312 3.18 38 47.61 122 46.84 2.52 20 .04 .2 .4 GEY 1.9 96 MAR 23 836 24.88 38 48.16 122 46.50 2.37 11 .03 .3 .4 GEY 1.6 96 MAR 23 1511 24.64 38 43.42 122 52.99 6.22 11 2 .06 .3 1.2 ROG 1.4 96 MAR 23 1618 56.49 37 18.95 121 41.05 6.27 54 .09 .2 .5 SFL 2.2 96 MAR 23 1624 43.93 37 28.79 118 48.76 6.17 12 .06 .6 2.9 MOR 1.1 96 MAR 23 1712 9.70 38 46.98 122 46.20 4.22 10 .12 .5 1.0 GEY 2.0 96 MAR 23 1736 38.64 37 18.81 121 41.08 7.54 12 .05 .3 .6 SFL 1.2 96 MAR 23 2043 16.31 37 35.71 118 49.01 6.55 7 .06 1.1 1.7 MOR 1.7 96 MAR 24 126 41.74 38 56.18 122 36.76 3.00 7 .11 .7 8.7 BAR - 2.0 96 MAR 24 149 51.46 37 27.96 118 41.40 5.18 8 .04 6.9 3.3 WCS - 1.3 96 MAR 24 241 58.34 37 35.61 118 51.78 4.68 12 .06 .5 .5 MOR 1.5 96 MAR 24 243 47.75 37 29.40 118 50.58 8.59 17 .06 .3 1.5 MOR 1.4 96 MAR 24 447 47.98 38 42.71 119 37.82 5.97 7 .04 2.3 1.3 WAK 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 96 MAR 24 504 4.19 37 40.75 118 58.14 2.66 15 .06 .3 .5 WMO 1.5 96 MAR 24 524 48.00 36 56.01 121 4.96 9.37 8 .11 1.1 3.8 ORT 1.2 96 MAR 24 726 20.03 37 33.78 118 49.74 3.86 7 .06 1.7 1.2 MOR 1.3 96 MAR 24 1131 25.80 36 30.53 121 5.37 5.02 17 .04 .3 .7 BIT 1.6 96 MAR 24 1155 38.40 37 29.90 118 52.51 6.79 17 .06 .3 1.2 MOR 1.9 96 MAR 24 1156 13.38 37 29.73 118 52.60 5.17 17 .07 .4 1.5 MOR 1.5 96 MAR 24 1158 53.23 37 29.69 118 52.18 7.89 12 .05 .8 2.7 MOR 1.3 96 MAR 24 1159 12.82 37 27.83 118 51.99 2.05 9 .04 3.5 8.7 MOR - 96 MAR 24 1300 55.47 37 8.69 121 32.99 6.88 14 .06 1.1 2.0 CYN 1.5 96 MAR 24 1321 58.83 37 36.90 118 51.55 7.32 24 .06 .3 .4 SMO 2.2 96 MAR 24 1421 6.03 37 36.79 118 51.41 7.34 15 .06 .3 .4 SMO 1.6 96 MAR 24 1614 34.14 36 5.73 120 13.57 8.66 8 .04 .5 1.1 COA 1.6 96 MAR 24 1734 57.71 35 48.01 118 20.26 13.41 14 .05 .3 .9 WWF 2.3 96 MAR 24 2359 18.73 37 37.73 118 51.12 8.77 26 1 .05 .3 .4 SMO 2.6 96 MAR 25 28 42.58 36 41.15 121 20.61 12.40 16 .05 .3 .6 STN 1.5 96 MAR 25 42 25.54 37 6.55 121 49.35 3.46 19 1 .07 .3 .5 LOM 1.2 96 MAR 25 139 11.00 40 18.30 121 19.06 3.50 16 1 .11 1.1 3.0 ALM 2.3 96 MAR 25 149 32.49 37 34.87 122 25.73 8.13 11 1 .04 .3 .6 SFP 1.2 96 MAR 25 333 51.32 40 32.53 121 39.27 11.36 7 2 .03 .7 .8 SHA 2.0 96 MAR 25 337 7.33 40 32.79 121 38.84 11.53 10 1 .05 .6 .5 SHA 2.4 96 MAR 25 732 32.48 37 28.00 118 50.17 2.83 20 .09 .3 3.0 MOR 1.5 96 MAR 25 846 54.10 38 47.16 122 46.46 5.13 26 1 .05 .2 .4 GEY 1.9 96 MAR 25 849 3.13 40 17.56 124 21.46 9.05 12 1 .10 .7 .5 MEN 2.0 96 MAR 25 918 10.37 36 8.10 120 40.84 6.45 42 2 .08 .2 .3 SLA 2.5 96 MAR 25 927 11.95 38 47.61 122 46.67 4.65 13 .04 .3 .6 GEY 1.4 96 MAR 25 1117 11.94 37 34.70 122 25.62 7.40 76 4 .09 .1 .3 SFP 2.7 96 MAR 25 1127 28.94 37 38.18 118 57.84 9.68 20 1 .07 .3 .6 SMO 1.9 96 MAR 25 1629 17.34 36 56.09 121 25.90 5.59 26 .11 .3 1.0 HOL 1.5 96 MAR 25 1833 11.01 36 41.88 121 19.68 6.68 15 2 .02 .3 .6 STN 1.0 96 MAR 25 1911 31.35 36 33.88 121 1.95 10.59 11 .11 .6 1.4 PAN 1.1 96 MAR 25 2038 12.49 37 28.07 118 52.51 5.18 8 .03 1.3 7.3 MOR - 1.2 96 MAR 25 2047 33.48 37 28.87 118 53.46 16.98 12 .21 1.0 2.8 MOR 2.5 96 MAR 25 2242 45.31 38 49.27 122 48.82 3.40 10 .08 .4 .8 GEY 1.8 96 MAR 26 9 42.53 37 30.02 118 52.56 5.61 11 .06 .8 2.9 MOR 1.3 96 MAR 26 44 59.43 36 34.93 121 10.69 3.86 9 .04 .3 .6 PIN 1.2 96 MAR 26 437 12.57 37 9.68 121 58.86 11.77 14 .09 .4 1.0 LOM 1.3 96 MAR 26 558 45.75 36 41.11 121 18.82 4.23 26 .05 .2 .5 STN 1.9 96 MAR 26 734 54.27 35 59.52 120 32.61 5.48 18 .04 .4 .3 MID 1.5 96 MAR 26 742 58.53 35 59.40 120 32.77 5.59 7 .01 .6 1.3 MID 1.1 96 MAR 26 858 14.08 37 41.01 118 52.70 1.83 14 .06 .3 .8 DOM 1.8 96 MAR 26 1027 12.07 38 49.05 122 47.74 5.36 10 .10 .4 .6 GEY 1.4 96 MAR 26 1042 16.42 38 42.41 119 37.44 7.88 9 .07 .9 2.4 WAK 2.4 96 MAR 26 1231 51.05 37 37.27 118 53.27 5.57 16 .09 .4 .5 SMO 1.6 96 MAR 26 1247 13.09 38 43.51 119 43.78 3.79 10 .08 .9 1.9 WAK 1.9 96 MAR 26 1254 55.20 37 37.27 118 51.33 9.98 14 .09 .5 .6 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 MAR 26 1337 58.58 40 19.19 124 29.12 20.28 12 .06 2.9 .3 MEN 2.3 96 MAR 26 1609 51.02 38 47.55 122 46.73 2.22 13 .03 .2 .5 GEY 1.6 96 MAR 26 1611 4.09 37 18.66 121 41.04 6.81 29 .08 .3 1.0 SFL 2.1 96 MAR 26 1815 44.22 39 0.62 119 15.45 0.16 26 1 .58 2.2 5.3 WAK * 2.5 96 MAR 26 1959 6.74 35 41.54 118 3.33 14.10 10 1 .11 .5 1.1 WWF 1.4 96 MAR 26 2000 28.90 38 48.21 122 47.35 5.24 8 .11 .5 .9 GEY 1.7 96 MAR 26 2321 22.07 36 58.66 123 5.70 0.92 7 .2310.017.2 POS - 1.4 96 MAR 27 7 47.74 38 4.68 118 52.09 11.12 21 1 .10 .5 2.7 MOL 1.9 96 MAR 27 130 57.48 37 37.29 118 51.36 9.77 16 .09 .5 .6 SMO 1.2 96 MAR 27 348 44.85 36 2.29 120 35.27 8.56 20 .07 .5 .3 SLA 1.4 96 MAR 27 640 50.23 36 45.81 121 25.28 5.18 19 .16 .4 1.1 SJB 1.2 96 MAR 27 736 48.00 37 28.88 118 48.67 5.49 14 .07 .5 2.2 MOR 1.4 96 MAR 27 756 43.31 38 47.96 122 48.53 3.98 25 .05 .2 .5 GEY 2.6 96 MAR 27 756 44.20 38 47.18 122 51.85 8.58 9 .16 .6 1.1 GEY 2.5 96 MAR 27 800 4.34 38 49.71 122 48.90 1.62 9 .04 .3 .6 GEY 1.4 96 MAR 27 821 31.08 38 53.62 123 0.98 0.03 10 .09 .4 3.9 MAA * 1.9 96 MAR 27 903 55.02 36 19.72 120 53.22 8.60 11 1 .06 .3 .5 BIT 1.1 96 MAR 27 927 14.44 36 27.31 120 29.12 12.24 40 2 .13 .4 .7 CRV 2.6 96 MAR 27 1135 0.69 38 47.91 122 44.52 2.31 11 .07 .3 .8 GEY 1.7 96 MAR 27 1225 10.94 38 48.13 122 44.48 2.47 9 .05 .4 .9 GEY 1.6 96 MAR 27 1315 32.69 37 35.00 118 30.16 8.70 7 .01 .4 1.6 CHV 2.2 96 MAR 27 1444 23.98 37 38.09 118 56.91 9.18 23 .14 .4 .6 SMO * 2.1 96 MAR 27 1600 5.11 37 8.54 122 24.34 9.09 29 .22 1.9 1.0 ANN 2.2 96 MAR 27 1810 59.00 36 33.41 121 9.21 6.99 14 .06 .3 .9 PIN 1.6 96 MAR 27 2218 37.72 37 37.63 118 51.25 8.87 11 .03 .4 .6 SMO 2.0 96 MAR 27 2303 11.91 38 49.18 122 45.83 0.52 9 .08 .3 1.0 GEY 1.8 96 MAR 28 136 21.63 37 37.46 118 51.49 9.94 17 .10 .4 .8 SMO 3.2 96 MAR 28 239 30.99 37 37.39 118 51.72 9.90 16 .08 .4 .7 SMO 2.3 96 MAR 28 242 8.58 37 37.18 118 51.45 9.39 15 .09 .4 .8 SMO 2.7 96 MAR 28 243 25.53 38 46.88 122 45.77 2.19 13 .04 .3 .7 GEY 1.9 96 MAR 28 255 38.11 37 37.51 118 51.02 9.57 10 .07 .8 .7 SMO 1.4 96 MAR 28 316 19.96 37 36.80 118 51.27 9.72 15 .08 .5 .7 SMO 2.0 96 MAR 28 331 36.94 37 37.28 118 51.23 8.87 13 .15 .9 .7 SMO 1.9 96 MAR 28 518 34.31 37 37.52 118 51.94 10.49 17 .11 .5 .9 SMO 2.1 96 MAR 28 554 56.54 37 37.61 118 51.21 9.12 9 .04 .8 .6 SMO 1.5 96 MAR 28 622 41.32 36 32.97 121 8.50 7.30 7 .02 .4 1.1 PIN 1.3 96 MAR 28 712 1.23 38 48.43 122 47.99 3.95 13 .08 .4 .6 GEY 1.8 96 MAR 28 724 7.49 37 17.71 122 2.68 6.60 10 .07 .6 .7 SCV 1.2 96 MAR 28 724 42.14 38 47.58 122 45.48 1.90 8 .03 .3 .8 GEY 1.4 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 ------------------------------------------------------------------------------- MAR 19 000039.8& 60.890N 150.660W 41 3.9 41 KENAI PENINSULA, ALASKA. . Felt in the Anchorage area. 000535.7* 51.926N 29.888W 10G 3.7 1.0 8 NORTHERN MID-ATLANTIC RIDGE 015652.3* 6.823N 73.081W 164D 4.3 0.8 37 NORTHERN COLOMBIA 060953.5* 18.912S 67.433E 10G 4.2 1.0 17 MID-INDIAN RIDGE 072506.6 24.092N 122.306E 33N 4.8 1.3 57 TAIWAN REGION 073328.1 24.022N 122.208E 33N 4.9 5.1 1.0 71 TAIWAN REGION 104838.9* 24.916N 96.347E 33N 4.5 3.8 1.4 29 MYANMAR 123540.0 10.646S 161.253E 82* 4.8 0.8 46 SOLOMON ISLANDS 133425.3? 1.47 N 126.80 E 33N 3.6 1.1 5 NORTHERN MOLUCCA SEA 140655.4 17.655N 105.658W 33N 4.2 1.3 21 OFF COAST OF JALISCO, MEXICO 163254.0* 39.847N 76.757E 33N 4.1 0.5 7 SOUTHERN XINJIANG, CHINA 172409.3* 52.038N 29.943W 10G 3.9 0.9 11 NORTHERN MID-ATLANTIC RIDGE 173224.6* 40.046N 76.404E 33N 3.8 1.0 8 KYRGYZSTAN-XINJIANG BORDER REG. 214829.1? 6.60 S 129.48 E 33N 4.1 1.1 8 BANDA SEA MAR 20 001452.6 40.122N 76.836E 21D 4.5 1.3 33 KYRGYZSTAN-XINJIANG BORDER REG. 004650.2? 24.19 S 176.63 W 33N 4.1 1.0 8 SOUTH OF FIJI ISLANDS 012653.0 45.519N 150.047E 53D 4.1 0.9 31 KURIL ISLANDS 021123.0 42.151N 87.573E 33N 4.7 4.1 1.0 41 NORTHERN XINJIANG, CHINA 023829.1? 3.96 S 129.43 E 138? 4.2 1.1 9 SERAM, INDONESIA 042513.1 34.177N 137.844E 309 4.2 0.5 25 NEAR S. COAST OF HONSHU, JAPAN 044446.4* 15.993N 97.128W 33N 4.3 1.2 28 NEAR COAST OF OAXACA, MEXICO 044645.6? 0.39 S 136.80 E 33N 4.1 1.1 9 IRIAN JAYA REGION, INDONESIA 052216.1* 48.399N 154.252E 33N 4.6 1.0 11 KURIL ISLANDS 073758.1 34.325N 118.682W 10G 3.8 0.7 77 SOUTHERN CALIFORNIA. ML 4.0 (GS). Felt in the San Fernando area. 080326.6* 0.817S 135.494E 33N 4.2 1.0 12 IRIAN JAYA REGION, INDONESIA 094708.8* 39.611N 77.684E 33N 3.6 0.4 8 SOUTHERN XINJIANG, CHINA 100912.2? 12.60 N 88.44 W 165? 4.0 0.6 13 OFF COAST OF CENTRAL AMERICA 102654.4* 5.100S 152.521E 33N 4.5 0.9 17 NEW BRITAIN REGION, P.N.G. 103240.0* 5.402S 152.612E 33N 4.1 1.1 13 NEW BRITAIN REGION, P.N.G. 114841.7* 36.911N 36.013E 10G 3.9 0.7 11 JORDAN - SYRIA REGION 122056.3* 25.669S 179.127W 464? 4.1 0.5 14 SOUTH OF FIJI ISLANDS 134333.1* 51.625N 29.611W 10G 3.9 1.0 13 NORTHERN MID-ATLANTIC RIDGE 135719.7 51.876N 30.098W 10G 3.9 0.8 19 NORTHERN MID-ATLANTIC RIDGE 143039.6 37.772N 142.231E 33N 4.0 1.0 26 OFF EAST COAST OF HONSHU, JAPAN 143704.5% 67.916N 159.680W 33N 0.4 6 NORTHERN ALASKA. ML 3.3 (PMR). 173548.0 21.319S 175.607W 58D 4.7 0.6 37 TONGA ISLANDS 180841.5 15.965N 97.239W 33N 5.1 4.4 1.0 75 NEAR COAST OF OAXACA, MEXICO 191403.4 27.986N 130.152E 33N 4.0 1.0 26 RYUKYU ISLANDS 192115.0 52.282N 30.041W 10G 4.2 0.8 29 NORTHERN MID-ATLANTIC RIDGE 202714.1 51.968N 30.215W 10G 4.0 0.9 28 NORTHERN MID-ATLANTIC RIDGE 220353.2* 45.410N 150.655E 33N 3.9 0.7 10 KURIL ISLANDS 222242.9 51.011N 30.014W 10G 4.9 4.7 1.0 67 NORTHERN MID-ATLANTIC RIDGE 225457.7* 41.505N 142.221E 63 4.0 0.8 17 HOKKAIDO, JAPAN REGION MAR 21 024900.1 21.591N 143.216E 305* 3.8 0.8 11 MARIANA ISLANDS REGION 041117.9? 52.17 N 30.07 W 10G 3.7 1.7 14 NORTHERN MID-ATLANTIC RIDGE 041512.0* 0.152N 123.277E 199D 4.2 1.2 16 MINAHASSA PENINSULA, SULAWESI 041803.8* 51.971N 29.581W 10G 3.4 1.2 12 NORTHERN MID-ATLANTIC RIDGE 042134.6? 31.11 S 179.84 E 434D 4.1 1.5 11 KERMADEC ISLANDS REGION 043227.1 39.855N 69.412E 33N 4.5 1.0 38 TAJIKISTAN 050507.1* 10.931S 165.871E 52D 4.5 1.0 15 SANTA CRUZ ISLANDS 050713.5 52.053N 30.090W 10G 4.6 0.8 67 NORTHERN MID-ATLANTIC RIDGE 075544.7 61.551N 150.021W 58 3.0 1.1 22 SOUTHERN ALASKA 081939.4* 51.072N 30.980W 10G 3.4 1.0 8 NORTHERN MID-ATLANTIC RIDGE 084101.6 8.994N 126.461E 87* 4.7 1.2 44 MINDANAO, PHILIPPINE ISLANDS 090140.6* 9.020N 126.841E 26* 4.1 1.1 19 MINDANAO, PHILIPPINE ISLANDS 114819.1* 31.962S 67.810W 128? 3.4 1.1 11 SAN JUAN PROVINCE, ARGENTINA 121110.4* 51.362N 178.512W 33N 4.2 1.4 39 ANDREANOF ISLANDS, ALEUTIAN IS. 130219.6* 40.212N 29.744E 10G 3.9 1.4 18 TURKEY 150030.8? 30.29 N 88.42 E 33N 3.9 1.4 9 XIZANG 150916.4* 39.943N 77.117E 33N 4.0 1.2 13 SOUTHERN XINJIANG, CHINA 154315.1 14.632S 167.918E 33N 4.9 5.1 1.2 51 VANUATU ISLANDS 163048.1 51.696N 16.114E 9 3.3 1.4 18 POLAND 175918.0* 8.997N 126.616E 80? 4.5 1.5 25 MINDANAO, PHILIPPINE ISLANDS 183801.4* 5.121S 152.532E 33N 4.0 0.7 14 NEW BRITAIN REGION, P.N.G. 190547.5 50.897N 30.113W 33N 4.1 0.8 25 NORTHERN MID-ATLANTIC RIDGE 190939.8* 6.904S 128.644E 33N 3.9 1.5 10 BANDA SEA 193659.4% 33.693S 69.987W 10G 0.2 8 CHILE-ARGENTINA BORDER. MD 3.2 195259.7* 0.283N 119.403E 75? 4.7 4.7 1.3 28 MINAHASSA PENINSULA, SULAWESI 200110.6* 23.123N 144.087E 33N 3.9 0.5 8 VOLCANO ISLANDS REGION 211051.1 22.942S 179.556W 500G 4.5 0.8 16 SOUTH OF FIJI ISLANDS 211855.1% 33.509S 70.256W 100G 0.3 11 CHILE-ARGENTINA BORDER. MD 3.5 212722.6* 9.050N 126.536E 33N 4.4 1.2 22 MINDANAO, PHILIPPINE ISLANDS 214326.7* 8.968N 126.597E 75? 4.6 1.3 39 MINDANAO, PHILIPPINE ISLANDS 222907.2 36.715N 121.335W 5G 0.7 7 CENTRAL CALIFORNIA. ML 3.2 224409.6* 50.706N 30.095W 23D 4.0 1.0 10 NORTHERN MID-ATLANTIC RIDGE 232316.9? 21.22 S 179.22 W 500G 4.3 1.4 17 FIJI ISLANDS REGION MAR 22 013537.0% 33.410S 71.353W 50G 0.3 10 NEAR COAST-CENTRAL CHILE. MD 3.0 032420.1 51.262N 178.679E 20G 5.7 6.6 1.3 226 RAT ISLANDS, ALEUTIAN ISLANDS. 032833.3* 51.235N 178.679E 33N 5.1 1.2 31 RAT ISLANDS, ALEUTIAN ISLANDS 033613.1* 51.204N 178.848E 33N 4.6 1.0 9 RAT ISLANDS, ALEUTIAN ISLANDS 034903.2* 51.385N 178.877E 33N 4.8 1.1 34 RAT ISLANDS, ALEUTIAN ISLANDS 040142.8 51.271N 178.822E 33N 5.3 1.0 63 RAT ISLANDS, ALEUTIAN ISLANDS 040142.9 51.139N 178.799E 33N 5.2 1.2 90 RAT ISLANDS, ALEUTIAN ISLANDS 041111.2* 51.109N 178.959E 33N 4.6 1.3 11 RAT ISLANDS, ALEUTIAN ISLANDS 042123.6* 51.198N 179.010E 33N 4.9 0.9 31 RAT ISLANDS, ALEUTIAN ISLANDS 044609.5* 51.282N 179.024E 33N 4.6 1.1 32 RAT ISLANDS, ALEUTIAN ISLANDS 050933.7 37.237N 142.130E 10G 4.2 1.0 31 OFF EAST COAST OF HONSHU, JAPAN 052659.8 51.274N 178.929E 33N 5.3 1.0 61 RAT ISLANDS, ALEUTIAN ISLANDS 071043.8 51.311N 178.853E 33N 4.6 0.8 25 RAT ISLANDS, ALEUTIAN ISLANDS 082638.9* 40.108N 76.697E 33N 5.1 1.1 20 KYRGYZSTAN-XINJIANG BORDER REG. 090648.0* 51.290N 178.762E 33N 4.9 0.9 35 RAT ISLANDS, ALEUTIAN ISLANDS 090839.0* 51.093N 178.755E 33N 4.7 1.1 18 RAT ISLANDS, ALEUTIAN ISLANDS 091234.6* 51.096N 178.633E 33N 4.8 0.8 28 RAT ISLANDS, ALEUTIAN ISLANDS 103026.1* 16.081N 97.889W 33N 4.8 1.0 39 OAXACA, MEXICO 110600.7? 12.58 N 89.65 W 33N 4.2 1.5 15 OFF COAST-CENTRAL AMERICA 112053.2? 11.05 N 86.86 W 33N 4.7 0.7 17 NEAR COAST OF NICARAGUA 113817.8 44.630N 148.165E 33N 3.8 0.9 19 KURIL ISLANDS 144416.2? 51.43 N 178.99 E 33N 4.5 1.0 7 RAT ISLANDS, ALEUTIAN ISLANDS 144627.6? 51.13 N 178.90 E 33N 4.7 0.9 12 RAT ISLANDS, ALEUTIAN ISLANDS 152828.8 40.303N 25.904E 10G 3.9 0.9 29 AEGEAN SEA 153824.4* 51.221N 178.849E 33N 4.9 1.0 39 RAT ISLANDS, ALEUTIAN ISLANDS 155506.9* 19.397N 145.720E 203* 3.6 1.1 14 MARIANA ISLANDS 171704.9* 51.195N 178.773E 33N 4.6 1.1 26 RAT ISLANDS, ALEUTIAN ISLANDS 173106.7* 35.221S 179.196W 33N 5.9 5.8 1.0 37 EAST OF NORTH ISLAND, N.Z. 175748.2 6.270S 128.511E 320D 4.5 1.3 22 BANDA SEA 184526.0* 26.418S 13.666W 10G 4.9 1.0 43 SOUTHERN MID-ATLANTIC RIDGE 202213.3& 41.760N 71.240W 5G 4 SOUTHERN NEW ENGLAND. . mbLg 3.5 (GS). Felt in parts of southeastern Massachusetts and in parts of Rhode Island. 220337.0% 63.302N 154.172W 10G 0.5 8 CENTRAL ALASKA. ML 3.3 (PMR). 225414.7 30.456N 132.578E 36D 4.5 0.9 31 SOUTHEAST OF SHIKOKU, JAPAN 230634.5* 36.582N 21.755E 10G 4.1 0.9 19 SOUTHERN GREECE MAR 23 023425.0% 32.847S 71.662W 50G 0.4 11 NEAR COAST-CENTRAL CHILE. MD 3.9 030553.0* 8.318N 72.675W 199D 4.9 0.8 24 VENEZUELA 062734.7* 21.799S 174.764W 34D 4.8 1.1 36 TONGA ISLANDS 071036.8* 51.033N 156.934E 33N 0 KAMCHATKA 073246.6* 51.013N 176.742W 33N 5.1 0.9 31 ANDREANOF ISLANDS, ALEUTIAN IS. 120534.5* 51.013N 178.619E 33N 4.1 1.2 21 RAT ISLANDS, ALEUTIAN ISLANDS 143322.2 30.609S 71.421W 33N 4.6 1.0 19 NEAR COAST-CENTRAL CHILE. MD 4.8 192441.2 52.098N 170.524W 33N 4.9 1.0 28 FOX ISLANDS, ALEUTIAN ISLANDS MAR 24 031934.9* 10.579N 62.591W 65D 5.0 0.9 40 NEAR COAST OF VENEZUELA 061914.6* 38.169N 26.767W 10G 4.9 1.2 21 AZORES ISLANDS 201612.7& 34.255N 105.681W 10 8 NEW MEXICO. . mbLg 3.5 (GS). MD 2.8 (SNM). Felt in the Corona area. 201923.1& 34.270N 105.689W 10 9 NEW MEXICO. . mbLg 3.7 (GS). MD 3.3 (SNM). Felt in the Corona area. MAR 25 004400.8 55.590N 161.618E 33N 4.6 0.7 20 NEAR EAST COAST OF KAMCHATKA 064346.6 35.590N 102.586W 5G 0.8 12 TEXAS PANHANDLE REGION. mbLg 3.5 135438.9 34.238N 118.596W 15G 0.6 50 SOUTHERN CALIFORNIA. ML 3.2 141550.4* 32.147N 88.684W 5G 1.2 5 MISSISSIPPI. mbLg 3.5 (GS). Felt at Quitman and throughout much of Clarke County. MAR 26 114820.7* 45.402N 150.225E 33N 4.9 0.6 32 KURIL ISLANDS 212541.4* 52.368N 168.701W 33N 4.9 1.5 35 FOX ISLANDS, ALEUTIAN ISLANDS MAR 27 123449 Q 16.4 N 98.0 W 33N 5.5 0.9 91 OAXACA, MEXICO 205206 Q 11.7 N 88.0 W 33N 5.6 1.2 87 NEAR COAST OF NICARAGUA MAR 28 072832 Q 12.3 N 57.3 E 10G 5.7 0.7 56 ARABIAN SEA 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.