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
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.
