USGS Body-Wave Moment Tensor Solution
EASTERN SEA OF JAPAN
13/01/22 13:29:22.89 Epicenter: 44.520 140.913 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 233 No. of sta: 27 Moment Tensor; Scale 10**17 Nm Mrr=-0.78 Mtt=-0.20 Mpp= 0.98 Mrt= 0.81 Mrp= 0.18 Mtp=-0.79 Principal axes: T Val= 1.40 Plg= 6 Azm= 61 N 0.10 41 325 P -1.50 48 158 Best Double Couple:Mo=1.5*10**17 NP1:Strike=187 Dip=53 Slip= -35 NP2: 299 63 -137
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.