USGS Body-Wave Moment Tensor Solution

NEAR EAST COAST OF HONSHU, JAPAN

11/04/07 14:32:44.60

Epicenter:  38.255  141.632
MW 7.1

USGS MOMENT TENSOR SOLUTION
Depth  50         No. of sta: 111
Moment Tensor;   Scale 10**19 Nm
  Mrr= 5.97       Mtt=-2.39
  Mpp=-3.58       Mrt=-0.32
  Mrp=-1.43       Mtp=-0.96
 Principal axes:
  T  Val=  6.18  Plg=82  Azm= 99
  N       -1.88       3      207
  P       -4.31       8      298

Best Double Couple:Mo=5.5*10**19
 NP1:Strike= 31 Dip=37 Slip=  94
 NP2:       205     53        87

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 form 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