USGS WPhase Moment Solution

KURIL ISLANDS

13/ 3/ 1 13:20:50.00

Epicenter:  50.944  157.475
MW 6.5

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 3/ 1 13:20:50.00
Centroid:   50.744  157.634
Depth  40         No. of sta:295
Moment Tensor;   Scale 10**18 Nm
  Mrr= 5.66       Mtt=-1.63
  Mpp=-4.03       Mrt= 2.88
  Mrp= 4.38       Mtp=-2.52
 Principal axes:
  T  Val=  7.72  Plg=68  Azm=304
  N     = -0.04       0      212
  P     = -7.68      21      122

Best Double Couple:Mo=7.7*10**18
 NP1:Strike=211 Dip=23 Slip=  89
 NP2:        33     66        91

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.