USGS Body-Wave Moment Tensor Solution
WESTERN SICHUAN, CHINA
13/04/20 00:02:47.43 Epicenter: 30.284 102.955 MW 6.5 USGS MOMENT TENSOR SOLUTION Depth 19 No. of sta: 51 Moment Tensor; Scale 10**18 Nm Mrr= 6.31 Mtt=-1.39 Mpp=-4.92 Mrt=-0.38 Mrp=-0.27 Mtp=-4.39 Principal axes: T Val= 6.33 Plg=87 Azm=173 N 1.56 2 34 P -7.90 2 304 Best Double Couple:Mo=7.2*10**18 NP1:Strike= 32 Dip=43 Slip= 87 NP2: 216 47 93
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.