USGS WPhase Moment Solution

OFF EAST COAST OF HONSHU, JAPAN

12/12/ 7  8:18:24.00

Epicenter:  37.888  144.090
MW 7.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/ 7  8:18:24.00
Centroid:   38.188  144.470
Depth  35         No. of sta: 19
Moment Tensor;   Scale 10**20 Nm
  Mrr= 0.13       Mtt= 0.15
  Mpp=-0.28       Mrt=-0.10
  Mrp=-1.11       Mtp= 0.14
 Principal axes:
  T  Val=  1.08  Plg=48  Azm=105
  N     =  0.12       8        5
  P     = -1.20      39      267

Best Double Couple:Mo=1.1*10**20
 NP1:Strike=303 Dip=10 Slip=  28
 NP2:       186     85        99

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.