USGS Body-Wave Moment Tensor Solution
NEAR S. COAST OF WESTERN HONSHU
13/04/12 20:33:17.58 Epicenter: 34.369 134.828 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 16 No. of sta: 85 Moment Tensor; Scale 10**17 Nm Mrr= 3.77 Mtt= 1.03 Mpp=-4.80 Mrt= 0.24 Mrp=-2.33 Mtp= 0.56 Principal axes: T Val= 4.36 Plg=76 Azm= 83 N 1.08 0 174 P -5.44 14 265 Best Double Couple:Mo=5.0*10**17 NP1:Strike=355 Dip=31 Slip= 91 NP2: 174 59 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 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.