USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 6  1:12:23.00

Epicenter: -10.751  165.088
MW 8.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 6  1:12:23.00
Centroid:  -11.051  165.088
Depth  15         No. of sta:112
Moment Tensor;   Scale 10**20 Nm
  Mrr= 6.03       Mtt=-2.19
  Mpp=-3.84       Mrt= 3.02
  Mrp=-9.42       Mtp= 2.96
 Principal axes:
  T  Val= 11.81  Plg=59  Azm= 81
  N     = -0.44       8      336
  P     =-11.37      29      242

Best Double Couple:Mo=1.2*10**21
 NP1:Strike=309 Dip=17 Slip=  61
 NP2:       159     75        99

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.