USGS Body-Wave Moment Tensor Solution
12/12/14 04:04:08.82 Epicenter: 13.970 -91.705 MW 5.2 USGS MOMENT TENSOR SOLUTION Depth 18 No. of sta: 26 Moment Tensor; Scale 10**16 Nm Mrr= 7.10 Mtt=-6.02 Mpp=-1.08 Mrt= 2.05 Mrp=-1.95 Mtp= 2.14 Principal axes: T Val= 7.72 Plg=77 Azm= 58 N -0.42 7 293 P -7.30 10 202 Best Double Couple:Mo=7.5*10**16 NP1:Strike=283 Dip=35 Slip= 77 NP2: 119 56 99
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.