USGS WPhase Moment Solution

SANTA CRUZ ISLANDS REGION

13/ 2/ 7  8: 3:41.00

Epicenter: -11.024  164.749
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 7  8: 3:41.00
Centroid:  -10.924  164.749
Depth  13         No. of sta: 40
Moment Tensor;   Scale 10**17 Nm
  Mrr=-5.99       Mtt= 0.67
  Mpp= 5.32       Mrt=-2.04
  Mrp=-0.81       Mtp= 1.70
 Principal axes:
  T  Val=  6.04  Plg= 6  Azm=110
  N     =  0.53      13      201
  P     = -6.58      74      353

Best Double Couple:Mo=6.3*10**17
 NP1:Strike=185 Dip=40 Slip=-111
 NP2:        32     53       -72

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.