USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 1 22:18:35.00

Epicenter: -11.133  165.360
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 1 22:18:35.00
Centroid:  -11.233  165.156
Depth  15         No. of sta: 22
Moment Tensor;   Scale 10**18 Nm
  Mrr= 2.79       Mtt=-0.71
  Mpp=-2.08       Mrt= 1.55
  Mrp=-2.93       Mtp= 1.08
 Principal axes:
  T  Val=  4.36  Plg=64  Azm= 62
  N     = -0.12       0      331
  P     = -4.24      25      241

Best Double Couple:Mo=4.3*10**18
 NP1:Strike=330 Dip=20 Slip=  89
 NP2:       152     70        90

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.