USGS Body-Wave Moment Tensor Solution
12/11/15 09:20:22.65 Epicenter: 18.389 -100.404 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 53 No. of sta: 23 Moment Tensor; Scale 10**18 Nm Mrr=-1.73 Mtt= 0.98 Mpp= 0.75 Mrt=-0.28 Mrp=-0.00 Mtp=-0.79 Principal axes: T Val= 1.68 Plg= 4 Azm=221 N 0.09 6 130 P -1.76 83 342 Best Double Couple:Mo=1.7*10**18 NP1:Strike=317 Dip=42 Slip= -81 NP2: 125 49 -98
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.