USGS Body-Wave Moment Tensor Solution
OFFSHORE CHIAPAS, MEXICO
13/01/11 16:30:43.30 Epicenter: 14.880 -92.676 MW 5.3 USGS MOMENT TENSOR SOLUTION Depth 54 No. of sta: 19 Moment Tensor; Scale 10**17 Nm Mrr=-0.53 Mtt=-0.01 Mpp= 0.54 Mrt= 0.74 Mrp=-0.72 Mtp=-0.21 Principal axes: T Val= 1.16 Plg=31 Azm= 59 N 0.03 12 321 P -1.19 57 212 Best Double Couple:Mo=1.2*10**17 NP1:Strike=182 Dip=18 Slip= -47 NP2: 318 77 -103
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.