USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/11  9:40:23.00

Epicenter: -11.057  166.735
MW 5.7

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/11  9:40:23.00
Centroid:  -10.757  166.735
Depth  11         No. of sta: 26
Moment Tensor;   Scale 10**17 Nm
  Mrr=-4.05       Mtt= 1.53
  Mpp= 2.51       Mrt= 1.10
  Mrp=-1.06       Mtp=-2.46
 Principal axes:
  T  Val=  4.79  Plg= 9  Azm= 50
  N     = -0.48       2      319
  P     = -4.32      79      215

Best Double Couple:Mo=4.6*10**17
 NP1:Strike=143 Dip=35 Slip= -85
 NP2:       318     55       -93

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.