USGS Body-Wave Moment Tensor Solution
12/10/10 12:19:46.76 Epicenter: 10.219 -85.373 MW 5.3 USGS MOMENT TENSOR SOLUTION Depth 16 No. of sta: 42 Moment Tensor; Scale 10**16 Nm Mrr= 8.35 Mtt=-2.84 Mpp=-5.51 Mrt= 4.17 Mrp=-3.71 Mtp= 3.58 Principal axes: T Val= 10.14 Plg=72 Azm= 33 N -0.48 6 141 P -9.65 17 233 Best Double Couple:Mo=9.9*10**16 NP1:Strike=332 Dip=29 Slip= 102 NP2: 138 62 83
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.