USGS Body-Wave Moment Tensor Solution
SICHUAN-YUNNAN-GUIZHOU RG, CHINA
12/09/07 03:19:42.31 Epicenter: 27.507 103.933 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 15 Moment Tensor; Scale 10**17 Nm Mrr= 0.03 Mtt= 0.60 Mpp=-0.63 Mrt=-0.92 Mrp= 0.82 Mtp=-3.17 Principal axes: T Val= 3.64 Plg=19 Azm=220 N -0.39 71 37 P -3.25 1 129 Best Double Couple:Mo=3.5*10**17 NP1:Strike=263 Dip=76 Slip= 167 NP2: 356 77 14
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.