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Explanation of Parameters

     27 APR 2009  (117)

     ot  = 22:54:28.57   +/-   0.00        ANDREANOF ISLANDS, ALEUTIAN IS. 
     lat =      50.979   +/-    0.0
     lon =    -173.206   +/-    0.0                                       
     dep =        10.0  (geophysicist)

     155 km (100 miles) SSE of Atka, Alaska (pop 90)
     215 km (135 miles) SW of Amukta Island, Alaska
     1830 km (1140 miles) WSW of Anchorage, Alaska
     2595 km (1610 miles) W of JUNEAU, Alaska
 
     ML 3.0 (AEIC).

     nph =    5 of   7    se = 0.00    FE=007                            held

     error ellipse = (  0.0,  0.0,  0.0;  0.0,  0.0,  0.0;  0.0,  0.0,  0.0)

 mb = 0.0 (  0)  ML = 0.0 (  0)  mblg = 0.0 (  0)  md = 0.0 (  0)  MS = 0.0 (  0)

 sta  phase     arrival     res   dist azm    amp  per mag     amp  per mag  sta
 ATKA P       22:54:51.99  -1.8    1.4 334                                   ATKA
      S       22:55:09.18  S res =  -2.7X
 KOWE P       22:54:52.64  -3.4    1.5 335                                   KOWE
 KOKL P       22:54:52.91  -2.4    1.5 336                                   KOKL
 KOFP P       22:54:52.94  -1.4    1.4 337                                   KOFP
      S       22:55:11.73  S res =  -1.3X
 OKTU P       22:55:28.73  -1.0    4.0  51                                   OKTU



 Generated 2009 MAY  6 at 23:16 UTC

Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver