USGS WPhase Moment Solution

OFF EAST COAST OF HONSHU, JAPAN

12/ 3/14  9: 8:37.00

Epicenter:  40.899  144.923
MW 6.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 3/14  9: 8:37.00
Centroid:   40.699  145.320
Depth  11         No. of sta: 89
Moment Tensor;   Scale 10**19 Nm
  Mrr=-2.95       Mtt= 2.54
  Mpp= 0.41       Mrt= 0.44
  Mrp= 0.70       Mtp=-0.02
 Principal axes:
  T  Val=  2.58  Plg= 4  Azm=358
  N     =  0.55      11      268
  P     = -3.13      77      111

Best Double Couple:Mo=2.9*10**19
 NP1:Strike=101 Dip=41 Slip= -73
 NP2:       259     51      -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.