USGS WPhase Moment Solution

13/ 2/20 21:23:8.00

Epicenter:  18.637 -103.872
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/20 21:23: 8.00
Centroid:   18.537 -103.766
Depth  13         No. of sta: 41
Moment Tensor;   Scale 10**17 Nm
  Mrr= 2.45       Mtt=-2.15
  Mpp=-0.30       Mrt= 1.74
  Mrp=-1.02       Mtp= 0.38
 Principal axes:
  T  Val=  3.24  Plg=68  Azm= 39
  N     = -0.32       7      289
  P     = -2.92      20      196

Best Double Couple:Mo=3.1*10**17
 NP1:Strike=273 Dip=26 Slip=  72
 NP2:       113     65        99

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.