USGS Body-Wave Moment Tensor Solution
OFF EAST COAST OF HONSHU, JAPAN
12/03/14 09:08:36.32 Epicenter: 40.920 144.912 MW 6.8 USGS MOMENT TENSOR SOLUTION Depth 21 No. of sta: 103 Moment Tensor; Scale 10**19 Nm Mrr=-1.96 Mtt= 2.28 Mpp=-0.32 Mrt=-0.24 Mrp= 0.19 Mtp=-0.23 Principal axes: T Val= 2.31 Plg= 3 Azm=185 N -0.32 6 275 P -1.99 83 64 Best Double Couple:Mo=2.2*10**19 NP1:Strike=101 Dip=49 Slip= -82 NP2: 269 42 -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.