USGS Body-Wave Moment Tensor Solution
WESTERN SICHUAN, CHINA
13/01/18 12:42:51.14 Epicenter: 31.071 99.575 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 20 Moment Tensor; Scale 10**17 Nm Mrr=-0.26 Mtt= 1.60 Mpp=-1.33 Mrt= 0.40 Mrp= 0.34 Mtp= 0.34 Principal axes: T Val= 1.73 Plg=13 Azm=352 N -0.28 70 223 P -1.45 15 86 Best Double Couple:Mo=1.6*10**17 NP1:Strike=219 Dip=89 Slip=-161 NP2: 129 71 -2
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.