USGS Body-Wave Moment Tensor Solution
12/11/11 10:54:42.25 Epicenter: 22.760 95.887 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 28 Moment Tensor; Scale 10**17 Nm Mrr=-0.19 Mtt= 0.84 Mpp=-0.65 Mrt=-0.62 Mrp= 0.54 Mtp= 5.19 Principal axes: T Val= 5.34 Plg= 1 Azm=139 N -0.07 81 237 P -5.28 9 49 Best Double Couple:Mo=5.3*10**17 NP1:Strike= 94 Dip=84 Slip= -7 NP2: 184 83 -174
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.