USGS Body-Wave Moment Tensor Solution

OFF EAST COAST OF HONSHU, JAPAN

12/03/14 09:08:36.32

Epicenter:  40.920  144.912
MW 6.8

USGS MOMENT TENSOR SOLUTION
Depth  21         No. of sta: 103
Moment Tensor;   Scale 10**19 Nm
  Mrr=-1.96       Mtt= 2.28
  Mpp=-0.32       Mrt=-0.24
  Mrp= 0.19       Mtp=-0.23
 Principal axes:
  T  Val=  2.31  Plg= 3  Azm=185
  N       -0.32       6      275
  P       -1.99      83       64

Best Double Couple:Mo=2.2*10**19
 NP1:Strike=101 Dip=49 Slip= -82
 NP2:       269     42       -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