USGS Body-Wave Moment Tensor Solution
SICHUAN-YUNNAN BORDER REG, CHINA
13/08/31 00:04:18.00 Epicenter: 28.229 99.370 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 7 No. of sta: 24 Moment Tensor; Scale 10**17 Nm Mrr=-1.94 Mtt= 2.27 Mpp=-0.32 Mrt= 0.35 Mrp=-1.51 Mtp=-0.85 Principal axes: T Val= 2.67 Plg=11 Azm= 21 N 0.18 29 117 P -2.85 59 273 Best Double Couple:Mo=2.8*10**17 NP1:Strike= 80 Dip=43 Slip=-136 NP2: 315 62 -57
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.