USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/02/20  0:09:19

Epicenter: -10.769  166.865
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/20 00:09:19.00
Centroid:  -10.969  166.865
Depth  11         No. of sta: 17
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.56       Mtt= 0.32
  Mpp= 1.24       Mrt= 2.17
  Mrp=-1.53       Mtp=-1.41
 Principal axes:
  T  Val=  3.54  Plg=26  Azm= 48
  N     = -0.48      13      310
  P     = -3.06      59      196

Best Double Couple:Mo=3.3*10**17
 NP1:Strike=169 Dip=22 Slip= -50
 NP2:       307     73      -104

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.