USGS WPhase Moment Solution

GULF OF CALIFORNIA

13/01/13 16:28:26

Epicenter:  25.915 -110.157
MW 5.7

USGS/WPHASE CENTROID MOMENT TENSOR
13/01/13 16:28:26.00
Centroid:   25.915 -110.157
Depth  11         No. of sta: 21
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.09       Mtt=-3.69
  Mpp= 3.79       Mrt= 0.37
  Mrp=-0.66       Mtp=-0.67
 Principal axes:
  T  Val=  3.97  Plg= 9  Azm= 84
  N     = -0.18      79      291
  P     = -3.78       4      175

Best Double Couple:Mo=3.9*10**17
 NP1:Strike=220 Dip=80 Slip=   3
 NP2:       130     87       170

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.