USGS Body-Wave Moment Tensor Solution
OFF EAST COAST OF HONSHU, JAPAN
11/07/10 00:57:12.63 Epicenter: 38.045 143.289 MW 7.0 USGS MOMENT TENSOR SOLUTION Depth 25 No. of sta: 92 Moment Tensor; Scale 10**19 Nm Mrr= 0.37 Mtt=-3.41 Mpp= 3.04 Mrt= 0.25 Mrp= 0.79 Mtp= 0.81 Principal axes: T Val= 3.36 Plg=15 Azm=277 N 0.15 75 89 P -3.52 2 187 Best Double Couple:Mo=3.4*10**19 NP1:Strike=321 Dip=78 Slip= 171 NP2: 53 81 12
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.