USGS Body-Wave Moment Tensor Solution
13/02/20 21:23:08.07 Epicenter: 18.639 -103.863 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 35 Moment Tensor; Scale 10**17 Nm Mrr= 1.69 Mtt=-1.05 Mpp=-0.64 Mrt= 1.18 Mrp=-0.63 Mtp= 0.93 Principal axes: T Val= 2.16 Plg=70 Azm= 19 N 0.08 6 125 P -2.24 19 217 Best Double Couple:Mo=2.2*10**17 NP1:Strike=316 Dip=27 Slip= 103 NP2: 122 64 84
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.