USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 6  1:54:15.00

Epicenter: -10.514  165.733
MW 7.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 6  1:54:15.00
Centroid:  -10.114  165.733
Depth  11         No. of sta: 16
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.00       Mtt= 3.11
  Mpp=-3.11       Mrt=-0.32
  Mrp=-0.80       Mtp=-2.35
 Principal axes:
  T  Val=  3.90  Plg= 0  Azm=198
  N     =  0.18      77      104
  P     = -4.08      11      288

Best Double Couple:Mo=4.0*10**19
 NP1:Strike=333 Dip=81 Slip=  -8
 NP2:        64     82      -170

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.