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Earthquake Hazards Program

Magnitude 8.1 SAMOA ISLANDS REGION

Tuesday, September 29, 2009 at 17:48:10 UTC

Historic USGS Moment Tensor Solutions

Historic Moment Tensor Solutions World Location
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

The most recent (20 or less) USGS Moment Tensor Solutions are shown.
Data from the Source Parameter Database.

                        E P I C E N T E R   |          MOMENT  |    P R I N C I P A L  A X E S       |N O D A L  P L A N E S | 
     DATE    TIME (UTC)   LAT      LONG  SRC|DEPTH     VAL  EX |     T            N            P     |     1           2     | %  SRC
  YR  MO DA HR MN SEC     deg      deg      |  km  Mw     Nm   |VAL  PL AZM  VAL  PL AZM  VAL  PL AZM|STK DP SLIP STK DP SLIP| DC
---------------------------------------------------------------------------------------------------------------------------------------
 2006 12 02 09:52:13.21 -17.774 -174.314 PDE|133.0 5.8 5.8  17 |4.86 21 360  1.78 55 236 -6.64 27 101|139 55   -4 231 87 -145| 46 GS              
 2007 07 06 17:40:49.64 -16.418 -172.644 PDE|  4.0 5.7 4.6  17 |4.91 34 202 -0.68 23 308 -4.23 47  65|238 24 -162 131 83  -67| 72 GS              
 2007 07 28 08:53:13.50 -15.898 -175.288 PDE|325.0 5.3 1.3  17 |1.15  4 157  0.21 14  66 -1.36 75 262|261 43  -69  54 50 -108| 69 GS              
 2007 08 26 12:37:31.19 -17.457 -174.335 PDE|                  |     40 105                    50 285| 15 85  -90 195  5  -90|    GS              
 2007 08 27 17:11:59.63 -17.311 -172.249 PDE|                  |     25 300                    65 120|210 70  -90  30 20  -90|    GS              
 2007 11 02 12:40:10.21 -15.376 -173.165 PDE| 14.0 5.6 3.4  17 |2.22 70 301  1.65  5 196 -3.87 18 104| 19 64   96 185 27   78| 15 GS              
 2007 11 02 13:30:44.02 -15.593 -173.066 PDE| 14.0 5.7 4.3  17 |3.10 66 306  1.78  7 197 -4.89 21 104| 21 67   98 180 24   71| 27 GS              
 2007 12 13 15:51:27.21 -15.213 -172.367 PDE| 14.0 6.0 1.1  18 |1.17  0 237 -0.17 19 327 -1.01 70 145|166 49  -63 308 48 -117| 71 GS              
 2008 01 22 07:55:48.88 -15.277 -175.348 PDE|  6.0 5.9 9.4  17 |0.78  1  59  0.26 84 168 -1.04  5 329| 15 88  175 105 85    2| 50 GS              
 2008 01 22 10:49:21.80 -15.419 -175.589 PDE|  4.0 6.0 1.3  18 |1.44  0 344 -0.24 77 252 -1.20 12  74|119 81   -9 210 81 -170| 67 GS              
 2008 02 01 10:26: 9.82 -15.551 -175.070 PDE| 29.0 5.4 1.4  17 |1.37 31 128  0.00 58 306 -1.38  0  38|268 69   24 169 68  157|100 GS              
 2008 04 04 04:03: 1.60 -15.281 -172.836 PDE| 33.0 5.4 1.6  17 |1.33 47 148  0.43 38 299 -1.75 14  41|282 70   49 171 45  151| 51 GS              
 2008 04 15 17:24:56.48 -18.696 -175.959 PDE| 11.0 5.6 3.0  17 |2.81 21 232  0.32 61  96 -3.13 18 329|281 88  151  12 61    2| 80 GS              
 2008 06 02 04:19:51.21 -15.223 -173.672 PDE| 33.0 5.5 2.0  17 |1.90 52 213  0.28 10 109 -2.18 35  11|291 81  101  60 14   40| 74 GS              
 2008 07 07 04:44:55.64 -16.428 -174.047 PDE|116.0 5.5 2.3  17 |2.07 38  93  0.49 39 223 -2.55 27 338|218 84   51 121 40  170| 62 GS              
 2008 07 16 08:11: 4.00 -16.599 -172.963 PDE| 23.0 5.6 3.1  17 |2.47 75 268  1.00 13 111 -3.47  5  19|302 52  107  95 41   69| 42 GS              
 2008 08 19 16:30:13.21 -15.087 -173.476 PDE|  4.0 6.1 1.5  18 |1.19 35 331  0.52 29 217 -1.71 40  98|121 30   -6 216 87 -119| 39 GS              
 2008 10 22 12:55:57.39 -18.414 -175.351 PDE|241.0 6.3 4.0  18 |4.01 27 127  0.04  9  32 -4.04 60 284|241 20  -60  30 73 -100| 98 GS              
 2008 11 05 03:41:43.22 -17.321 -174.362 PDE|178.0 5.7 3.8  17 |3.62 31   0  0.27 39 239 -3.89 34 115|238 89 -130 147 40   -2| 86 GS              
 2008 11 08 07:49:59.00 -15.223 -174.232 PDE|121.0 6.0 1.1  18 |1.05 33 139  0.05  1 230 -1.10 56 323|223 11  -98  51 79  -88| 91 GS              

Latest USGS Fast Moment Tensor Solutions

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


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