USGS WPhase Moment Solution

12/09/05 14:42:10

Epicenter:  10.119  -85.347
MW 7.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/09/05 14:42:10.00
Centroid:    9.919  -85.143
Depth  30         No. of sta: 41
Moment Tensor;   Scale 10**20 Nm
  Mrr= 1.71       Mtt=-1.26
  Mpp=-0.45       Mrt= 2.00
  Mrp=-1.29       Mtp= 0.73
 Principal axes:
  T  Val=  2.94  Plg=62  Azm= 34
  N     = -0.03       1      302
  P     = -2.91      27      211

Best Double Couple:Mo=2.9*10**20
 NP1:Strike=299 Dip=18 Slip=  86
 NP2:       122     72        91

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.