USGS WPhase Moment Solution
11/04/11 8:16:13 Epicenter: 37.006 140.476 MW 6.6 USGS/WPHASE CENTROID MOMENT TENSOR 11/04/11 08:16:13.00 Centroid: 37.006 140.676 Depth 15 No. of sta: 47 Moment Tensor; Scale 10**19 Nm Mrr=-1.06 Mtt= 0.48 Mpp= 0.57 Mrt=-0.02 Mrp= 0.02 Mtp=-0.15 Principal axes: T Val= 0.68 Plg= 0 Azm=233 N = 0.37 0 143 P = -1.06 89 45 Best Double Couple:Mo=0.9*10**19 NP1:Strike=324 Dip=44 Slip= -89 NP2: 143 46 -90
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 form 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.
