USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/02/23 14:31: 5

Epicenter: -11.721  165.041
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/23 14:31: 5.00
Centroid:  -11.921  165.041
Depth  13         No. of sta: 30
Moment Tensor;   Scale 10**17 Nm
  Mrr=-3.65       Mtt= 1.60
  Mpp= 2.05       Mrt= 0.64
  Mrp=-0.13       Mtp=-1.73
 Principal axes:
  T  Val=  3.60  Plg= 4  Azm= 48
  N     =  0.12       5      317
  P     = -3.72      82      172

Best Double Couple:Mo=3.7*10**17
 NP1:Strike=145 Dip=41 Slip= -81
 NP2:       313     49       -97

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.