USGS Body-Wave Moment Tensor Solution
13/09/07 00:13:29.86 Epicenter: 14.644 -92.104 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 67 No. of sta: 75 Moment Tensor; Scale 10**18 Nm Mrr=-0.68 Mtt=-0.51 Mpp= 1.19 Mrt= 3.64 Mrp=-3.31 Mtp= 0.15 Principal axes: T Val= 4.74 Plg=42 Azm= 54 N 0.54 10 315 P -5.28 47 214 Best Double Couple:Mo=5.0*10**18 NP1:Strike=210 Dip=10 Slip= -15 NP2: 314 87 -100
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.