USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 1  5:36:41.00

Epicenter: -11.134  165.479
MW 6.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 1  5:36:41.00
Centroid:  -11.234  165.479
Depth  15         No. of sta: 35
Moment Tensor;   Scale 10**17 Nm
  Mrr= 6.03       Mtt=-2.08
  Mpp=-3.95       Mrt= 4.73
  Mrp=-8.21       Mtp= 2.17
 Principal axes:
  T  Val= 11.39  Plg=60  Azm= 61
  N     = -0.67       1      329
  P     =-10.72      29      238

Best Double Couple:Mo=1.1*10**18
 NP1:Strike=325 Dip=16 Slip=  85
 NP2:       149     74        91

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.