USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/11 20: 9:54.00

Epicenter: -11.044  165.495
MW 5.7

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/11 20: 9:54.00
Centroid:  -10.943  165.495
Depth  11         No. of sta: 22
Moment Tensor;   Scale 10**17 Nm
  Mrr=-2.42       Mtt= 5.14
  Mpp=-2.72       Mrt=-1.96
  Mrp=-1.99       Mtp=-0.44
 Principal axes:
  T  Val=  5.62  Plg=13  Azm=179
  N     = -0.77      42       76
  P     = -4.85      44      283

Best Double Couple:Mo=5.3*10**17
 NP1:Strike=310 Dip=48 Slip= -26
 NP2:        58     71      -135

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.