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Explanation of Parameters

      4 JUL 2007  (185)

     ot  = 17:54:04.00   +/-   0.00         OFFSHORE COQUIMBO, CHILE        
     lat =     -31.467   +/-    0.0
     lon =     -71.680   +/-    0.0                                       
     dep =        26.7   +/-    0.0   

     50 km (30 miles) WNW of Illapel, Chile (pop 21,000)
     170 km (105 miles) S of Coquimbo, Chile
     175 km (110 miles) N of Valparaiso, Chile
     240 km (150 miles) NNW of SANTIAGO, Chile
 
     ML 2.9 (GUC).

     nph =    4 of   7    se = 0.00    FE=135                            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
 JACH eP      17:54:30.32   0.7    1.5 143                                   JACH
      iS      17:54:49.67  S res =  -0.9X
 TLL  iPd     17:54:30.40   1.0    1.5  30                                   TLL 
      iS      17:54:49.89  S res =  -0.1X
 TACH eP      17:54:40.51   0.7    2.3 164                                   TACH
 LMEL iPd     17:54:46.80   1.2    2.7 153                                   LMEL
      iS      17:55:19.77  S res =   2.5X



 Generated 2007 JUL 15 at 15:59 UTC

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