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Explanation of Parameters

      8 JUL 2007  (189)

     ot  = 05:15:33.30   +/-   0.00         ATACAMA, CHILE                  
     lat =     -27.498   +/-    0.0
     lon =     -69.759   +/-    0.0                                       
     dep =       138.1   +/-    0.0   

     60 km (35 miles) ESE of Copiapo, Chile (pop 125,000)
     155 km (95 miles) NE of Vallenar, Chile (pop 43,000)
     245 km (150 miles) SSE of Taltal, Chile
     665 km (415 miles) N of SANTIAGO, Chile
 
     MG 3.8 (GUC).

     nph =    4 of   8    se = 0.00    FE=123                            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 = 3.9 (  1)  MS = 0.0 (  0)

 sta  phase     arrival     res   dist azm    amp  per mag     amp  per mag  sta
 VACH iP      05:16:01.52   0.7    1.4 219                                   VACH
      iS      05:16:22.12  S res =   0.3X
 LCO  ePn     05:16:05.17   0.4    1.7 209 d:1.1+2     3.9  L:2.9-1 .30 2.9X LCO 
      eSn     05:16:28.88  S res =   0.1X  g:3.7-2 .75 2.7X
 TLL  iP      05:16:18.77   0.7    2.8 199                                   TLL 
      iS      05:16:53.42  S res =   0.8X
 CMCH iPc     05:16:30.21  -0.7    3.8 196                                   CMCH
      iS      05:17:14.66  S res =  -1.1X



 Generated 2007 JUL 22 at 00:03 UTC

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