USGS Body-Wave Moment Tensor Solution
12/09/29 07:11:13.16 Epicenter: 16.355 -98.388 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 4 No. of sta: 29 Moment Tensor; Scale 10**17 Nm Mrr= 1.03 Mtt=-0.87 Mpp=-0.17 Mrt= 1.56 Mrp=-0.51 Mtp= 0.45 Principal axes: T Val= 1.93 Plg=61 Azm= 13 N 0.04 4 110 P -1.97 28 203 Best Double Couple:Mo=2.0*10**17 NP1:Strike=304 Dip=17 Slip= 104 NP2: 109 74 86
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.