USGS WPhase Moment Solution

BAJA CALIFORNIA, MEXICO

12/04/12  7:15:48

Epicenter:  28.789 -113.141
MW 7.0

USGS/WPHASE CENTROID MOMENT TENSOR
12/04/12 07:15:48.00
Centroid:   28.689 -113.255
Depth  11         No. of sta: 10
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.24       Mtt=-3.59
  Mpp= 3.83       Mrt=-0.71
  Mrp=-1.48       Mtp= 0.16
 Principal axes:
  T  Val=  4.33  Plg=18  Azm= 92
  N     = -0.59      67      237
  P     = -3.74      11      358

Best Double Couple:Mo=4.1*10**19
 NP1:Strike=135 Dip=68 Slip= 175
 NP2:       227     86        22

Moment Tensor Solution
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.

Moment Tensor Solution

Details on the W-phase inversion algorithm.