USGS Body-Wave Moment Tensor Solution

OFF EAST COAST OF HONSHU, JAPAN

12/12/09 02:34:18.71

Epicenter:  37.766  143.591
MW 5.1

USGS MOMENT TENSOR SOLUTION
Depth   6         No. of sta: 11
Moment Tensor;   Scale 10**16 Nm
  Mrr=-5.03       Mtt=-0.65
  Mpp= 5.68       Mrt= 1.51
  Mrp= 2.44       Mtp= 1.30
 Principal axes:
  T  Val=  6.56  Plg=13  Azm=283
  N       -0.71      11       16
  P       -5.85      73      143

Best Double Couple:Mo=6.2*10**16
 NP1:Strike=202 Dip=59 Slip= -78
 NP2:       359     33      -110

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