USGS WPhase Moment Solution
OFF EAST COAST OF HONSHU, JAPAN
12/12/ 7 8:18:24.00 Epicenter: 37.888 144.090 MW 7.3 USGS/WPHASE CENTROID MOMENT TENSOR 12/12/ 7 8:18:24.00 Centroid: 38.188 144.470 Depth 35 No. of sta: 19 Moment Tensor; Scale 10**20 Nm Mrr= 0.13 Mtt= 0.15 Mpp=-0.28 Mrt=-0.10 Mrp=-1.11 Mtp= 0.14 Principal axes: T Val= 1.08 Plg=48 Azm=105 N = 0.12 8 5 P = -1.20 39 267 Best Double Couple:Mo=1.1*10**20 NP1:Strike=303 Dip=10 Slip= 28 NP2: 186 85 99
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.
