USGS WPhase Moment Solution

KURIL ISLANDS

12/ 9/ 9  5:39:36.00

Epicenter:  49.268  155.730
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/ 9  5:39:36.00
Centroid:   49.268  155.883
Depth  45         No. of sta: 32
Moment Tensor;   Scale 10**17 Nm
  Mrr= 6.84       Mtt=-1.53
  Mpp=-5.32       Mrt= 1.38
  Mrp= 4.35       Mtp=-3.56
 Principal axes:
  T  Val=  8.25  Plg=72  Azm=274
  N     =  0.48       6       27
  P     = -8.73      16      119

Best Double Couple:Mo=8.5*10**17
 NP1:Strike=219 Dip=30 Slip= 104
 NP2:        23     61        82

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.