USGS Centroid Moment Solution

IZU ISLANDS, JAPAN REGION

12/01/01 05:27:54.16

Epicenter:  31.412  138.121
MW 6.8

USGS CENTROID MOMENT TENSOR
12/01/01 05:28:13.40
Centroid:  31.782  138.214
Depth 360         No. of sta: 144
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.34       Mtt=-0.08
  Mpp= 0.42       Mrt=-0.19
  Mrp=-1.77       Mtp=-0.42
 Principal axes:
  T  Val=  1.87  Plg=38  Azm= 82
  N       -0.00      14      184
  P       -1.87      49      290

Best Double Couple:Mo=1.9*10**19
 NP1:Strike=  5 Dip=85 Slip= -76
 NP2:       116     15      -159

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