USGS Body-Wave Moment Tensor Solution
13/03/01 13:20:49.96 Epicenter: 50.838 157.632 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 35 No. of sta: 64 Moment Tensor; Scale 10**18 Nm Mrr= 5.30 Mtt=-2.26 Mpp=-3.04 Mrt= 1.58 Mrp= 2.02 Mtp=-2.68 Principal axes: T Val= 5.89 Plg=77 Azm=305 N 0.06 1 40 P -5.95 13 131 Best Double Couple:Mo=5.9*10**18 NP1:Strike= 40 Dip=58 Slip= 89 NP2: 222 32 92
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.