USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 1 22:16:37.00

Epicenter: -10.996  165.402
MW 6.3

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 1 22:16:37.00
Centroid:  -10.996  165.199
Depth  23         No. of sta: 30
Moment Tensor;   Scale 10**18 Nm
  Mrr= 2.72       Mtt=-0.68
  Mpp=-2.04       Mrt= 0.91
  Mrp=-1.44       Mtp= 0.99
 Principal axes:
  T  Val=  3.23  Plg=73  Azm= 54
  N     = -0.17       1      150
  P     = -3.06      16      241

Best Double Couple:Mo=3.1*10**18
 NP1:Strike=334 Dip=29 Slip=  94
 NP2:       150     61        88

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.