Phase Data

Explanation of Parameters


     29 JAN 2013  ( 29)

     ot  = 12:31:33.43   +/-   1.69              EASTERN TEXAS                   
     lat =      31.869   +/-   11.4
     lon =     -94.395   +/-    3.9              MAGNITUDE 2.8 (GS)       
     dep =         5.1   +/-    1.9   

     38 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
     366 km (227 miles) ENE of AUSTIN, Texas

     nph =   33 of  38    se = 0.83    FE=503                            A   

     error ellipse = (  2.0,  1.0, 17.6;271.0, 19.0,  6.3; 95.0, 70.0,  2.1)

 mb = 0.0 (  0)  ML = 0.0 (  0)  mblg = 2.8 ( 20)  md = 3.9 (  2)  MS = 0.0 (  0)

 sta  phase     arrival     res   dist azm    amp  per mag     amp  per mag  sta
 NATX ePg     12:31:38.70   0.4    0.3 244 d:1.8+2     3.7                   NATX
 Z41A ePn     12:32:06.87   0.0    1.9  44 d:1.3+2     4.1  g:1.2-1 1.1 3.2  Z41A
 WHTX ePn     12:32:15.91  -0.3    2.6 274 g:3.0-2 .88 2.7                   WHTX
      eSn     12:32:45.37  S res =  -2.9 
 MIAR ePn     12:32:17.50  -0.8    2.8  14 g:3.0-2 .73 2.8                   MIAR
      eSn     12:32:50.88  S res =  -1.1 
 X40A ePn     12:32:20.12  -0.4    2.9  26 g:2.0-2 .70 2.6                   X40A
      eSn     12:32:55.23  S res =  -0.8 
 CCAR ePn     12:32:22.45   0.7    3.0  47 g:5.0-2 1.0 3.1                   CCAR
 UALR ePn     12:32:26.62  -0.1    3.4  30                                   UALR
      eSn     12:33:06.06  S res =  -1.0 
 W39A ePn     12:32:26.95   0.4    3.4   9                                   W39A
      eSn     12:33:06.82  S res =   0.1 
 W41B ePn     12:32:32.09   0.1    3.8  28 g:1.0-2 .88 2.5                   W41B
 TUL1 ePn     12:32:37.41  -0.6    4.2 344 g:3.0-2 1.0 3.0                   TUL1
      eSn     12:33:25.03  S res =  -2.4 
 346A ePn     12:32:38.31  -0.3    4.2  95                                   346A
      eSn     12:33:27.60  S res =  -0.8 
 Z45A ePn     12:32:38.88   0.2    4.2  68 g:4.0-2 1.0 3.1                   Z45A
      eSn     12:33:27.83  S res =  -0.8 
 HHAR ePn     12:32:41.00  -0.1    4.4   5 g:1.0-2 .89 2.6                   HHAR
 ABTX ePn     12:32:41.39  -1.0    4.5 281 g:3.0-2 1.0 3.0                   ABTX
 WMOK ePn     12:32:45.45   1.0    4.7 309                                   WMOK
 JCT  ePn     12:32:47.54   0.6    4.8 255 g:3.0-2 .82 3.0                   JCT 
      eSn     12:33:40.77  S res =  -2.6 
 OXF  ePn     12:32:48.20  -0.1    4.9  56                                   OXF 
      eSn     12:33:43.60  S res =  -2.2 
 435B eSn     12:32:55.28  -1.1    2.9 249 g:5.0-2 1.0 3.0                   435B
 T42A ePn     12:33:00.41   0.0    5.8  27 g:1.0-2 .95 2.5                   T42A
 146A eSn     12:33:36.28  -0.8    4.6  79                                   146A
 147A eSn     12:33:52.60  -0.8    5.3  80                                   147A
 LRAL eSn     12:34:18.87  -1.9    6.4  78                                   LRAL
 X48A eSn     12:34:24.90  -3.8    6.7  65                                   X48A
 Z50A eSn     12:34:40.65  -3.0X   7.3  77                                   Z50A
 V48A eSn     12:34:42.37  -3.8X   7.4  57                                   V48A
 SWET eSn     12:34:54.69  -2.0X   7.8  62                                   SWET
 X51A eSn     12:35:09.07  -2.7X   8.4  69                                   X51A
 HPIG eSn     12:36:18.71   3.8X  11.0 246                                   HPIG



 Generated 2013 JAN 29 at 12:59 UTC

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