Phase Data

Explanation of Parameters


     31 JAN 2013  ( 31)

     ot  = 21:20:33.93   +/-   2.18              EASTERN TEXAS                   
     lat =      31.872   +/-   17.7
     lon =     -94.397   +/-    5.6              MAGNITUDE 2.7 (GS)       
     dep =         5.5   +/-    2.0   

     39 km (24 miles) NE of Nacogdoches, Texas (pop 30,000)
     67 km (42 miles) NNE of Lufkin, Texas (pop 30,000)
     248 km (154 miles) ESE of Dallas, Texas
     365 km (227 miles) ENE of AUSTIN, Texas
 
     Felt at Garrison, Tenaha and Timpson.

     nph =   10 of  10    se = 1.08    FE=503                            B   

     error ellipse = (167.0,  0.0, 28.3;257.0, 11.0,  6.2; 75.0, 78.0,  2.8)

 mb = 0.0 (  0)  ML = 0.0 (  0)  mblg = 2.7 (  6)  md = 3.0 (  1)  MS = 0.0 (  0)

 sta  phase     arrival     res   dist azm    amp  per mag     amp  per mag  sta
 NATX ePg     21:20:38.53  -0.3    0.3 244 d:7.9+1     3.0                   NATX
      eSg     21:20:42.65  S res =   0.5 
 Z41A ePn     21:21:10.91   3.6    1.9  44 g:8.0-2 1.0 3.0                   Z41A
 WHTX ePn     21:21:16.65   0.0    2.6 273                                   WHTX
      ePg     21:21:24.12   0.3 
 MIAR ePn     21:21:17.22  -1.5    2.8  14                                   MIAR
 W39A ePn     21:21:26.95   0.0    3.3   9                                   W39A
 VBMS ePn     21:21:27.08   0.7    3.3  83 g:2.0-2 .75 2.6                   VBMS
 X40A ePn     21:21:27.34   6.4    2.9  26                                   X40A
 HHAR ePn     21:21:40.29  -1.3    4.4   5                                   HHAR



 Generated 2013 FEB  1 at 07:46 UTC

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