USGS Body-Wave Moment Tensor Solution
12/11/11 22:15:00.60 Epicenter: 14.156 -92.188 MW 6.2 USGS MOMENT TENSOR SOLUTION Depth 20 No. of sta: 65 Moment Tensor; Scale 10**18 Nm Mrr= 1.48 Mtt=-1.28 Mpp=-0.20 Mrt= 1.58 Mrp=-0.55 Mtp= 0.23 Principal axes: T Val= 2.26 Plg=65 Azm= 23 N -0.16 3 286 P -2.10 25 195 Best Double Couple:Mo=2.2*10**18 NP1:Strike=277 Dip=20 Slip= 81 NP2: 107 70 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.