USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 2  4:16:20.00

Epicenter: -11.085  165.173
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 2  4:16:20.00
Centroid:  -10.985  165.173
Depth  11         No. of sta: 21
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.02       Mtt=-0.49
  Mpp=-2.54       Mrt= 3.33
  Mrp=-4.41       Mtp= 1.21
 Principal axes:
  T  Val=  6.33  Plg=58  Azm= 47
  N     = -0.03       5      145
  P     = -6.30      30      238

Best Double Couple:Mo=6.3*10**17
 NP1:Strike=345 Dip=15 Slip= 110
 NP2:       144     76        85

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.