USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/02/23  8:59: 8

Epicenter: -10.644  165.279
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/23 08:59: 8.00
Centroid:  -10.644  165.177
Depth  19         No. of sta: 44
Moment Tensor;   Scale 10**17 Nm
  Mrr= 7.42       Mtt= 1.64
  Mpp=-9.06       Mrt=-1.91
  Mrp=-2.71       Mtp=-1.05
 Principal axes:
  T  Val=  8.31  Plg=73  Azm=152
  N     =  1.34      13        9
  P     = -9.66       9      276

Best Double Couple:Mo=9.1*10**17
 NP1:Strike=351 Dip=37 Slip=  67
 NP2:       198     56       106

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.