USGS Body-Wave Moment Tensor Solution
13/03/01 12:53:51.45 Epicenter: 50.922 157.510 MW 6.3 USGS MOMENT TENSOR SOLUTION Depth 35 No. of sta:103 Moment Tensor; Scale 10**18 Nm Mrr= 3.29 Mtt=-0.50 Mpp=-2.79 Mrt= 0.85 Mrp= 1.32 Mtp=-1.09 Principal axes: T Val= 3.66 Plg=77 Azm=311 N -0.08 4 204 P -3.58 13 113 Best Double Couple:Mo=3.6*10**18 NP1:Strike= 26 Dip=58 Slip= 95 NP2: 197 32 82
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.