USGS WPhase Moment Solution

NEAR EAST COAST OF HONSHU, JAPAN

11/ 9/16 19:26:42.00

Epicenter:  40.288  142.727
MW 6.7

USGS/WPHASE CENTROID MOMENT TENSOR
11/ 9/16 19:26:42.00
Centroid:   40.288  143.251
Depth  15         No. of sta: 44
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.72       Mtt=-0.04
  Mpp=-0.67       Mrt= 0.44
  Mrp= 1.02       Mtp=-0.20
 Principal axes:
  T  Val=  1.32  Plg=61  Azm=297
  N     =  0.01       3      201
  P     = -1.33      28      109

Best Double Couple:Mo=1.3*10**19
 NP1:Strike=190 Dip=17 Slip=  79
 NP2:        22     73        93

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.