USGS Body-Wave Moment Tensor Solution

NEAR EAST COAST OF HONSHU, JAPAN

13/01/08 07:51:31.09

Epicenter:  40.183  142.366
MW 5.4

USGS MOMENT TENSOR SOLUTION
Depth  35         No. of sta: 63
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.10       Mtt= 0.08
  Mpp=-1.18       Mrt= 0.36
  Mrp= 1.10       Mtp=-0.82
 Principal axes:
  T  Val=  1.55  Plg=68  Azm=273
  N        0.46       7       22
  P       -2.01      20      115

Best Double Couple:Mo=1.8*10**17
 NP1:Strike= 19 Dip=66 Slip=  82
 NP2:       218     26       107

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