USGS Body-Wave Moment Tensor Solution

OFF EAST COAST OF HONSHU, JAPAN

12/12/07 08:18:23.82

Epicenter:  37.876  144.052
MW 7.3

USGS MOMENT TENSOR SOLUTION
Depth  42         No. of sta:112
Moment Tensor;   Scale 10**19 Nm
  Mrr= 8.53       Mtt= 0.28
  Mpp=-8.81       Mrt= 2.33
  Mrp=-3.26       Mtp=-1.36
 Principal axes:
  T  Val=  9.80  Plg=71  Azm= 36
  N       -0.31      16      183
  P       -9.49       9      276

Best Double Couple:Mo=9.7*10**19
 NP1:Strike= 24 Dip=38 Slip= 116
 NP2:       172     56        71

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