USGS WPhase Moment Solution

REVILLA GIGEDO ISLANDS REGION

11/11/ 1 12:32:0.00

Epicenter:  19.888 -109.173
MW 6.3

USGS/WPHASE CENTROID MOMENT TENSOR
11/11/ 1 12:32: 0.00
Centroid:   19.888 -109.173
Depth  17         No. of sta: 61
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.24       Mtt=-2.06
  Mpp= 2.30       Mrt=-0.31
  Mrp=-1.46       Mtp=-1.38
 Principal axes:
  T  Val=  3.22  Plg=21  Azm= 76
  N     = -0.52      61      212
  P     = -2.69      18      339

Best Double Couple:Mo=3.0*10**18
 NP1:Strike=117 Dip=61 Slip= 178
 NP2:       208     88        29

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.