USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 1/30 23: 3:45.00

Epicenter: -10.518  166.486
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 1/30 23: 3:45.00
Centroid:  -10.418  166.282
Depth  11         No. of sta: 25
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.16       Mtt= 0.13
  Mpp= 0.03       Mrt= 0.01
  Mrp= 0.42       Mtp=-1.50
 Principal axes:
  T  Val=  1.62  Plg= 9  Azm=225
  N     = -0.14      73      349
  P     = -1.49      13      132

Best Double Couple:Mo=1.6*10**18
 NP1:Strike=269 Dip=74 Slip=-177
 NP2:       179     87       -16

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.