USGS WPhase Moment Solution

OFFSHORE GUATEMALA

12/11/11 22:15:1.00

Epicenter:  14.205  -92.124
MW 6.5

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/11 22:15: 1.00
Centroid:   14.105  -92.228
Depth  15         No. of sta: 79
Moment Tensor;   Scale 10**18 Nm
  Mrr= 3.36       Mtt=-2.53
  Mpp=-0.83       Mrt= 6.04
  Mrp=-2.56       Mtp= 1.07
 Principal axes:
  T  Val=  7.46  Plg=57  Azm= 21
  N     = -0.31       0      113
  P     = -7.15      31      204

Best Double Couple:Mo=7.3*10**18
 NP1:Strike=298 Dip=13 Slip=  94
 NP2:       113     77        89

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.