USGS Body-Wave Moment Tensor Solution
12/06/07 16:03:18.36 Epicenter: -15.919 -72.516 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 105 No. of sta: 14 Moment Tensor; Scale 10**18 Nm Mrr= 0.30 Mtt=-0.81 Mpp= 0.51 Mrt=-0.50 Mrp=-1.20 Mtp=-0.19 Principal axes: T Val= 1.62 Plg=43 Azm= 97 N -0.32 29 218 P -1.31 33 328 Best Double Couple:Mo=1.5*10**18 NP1:Strike=214 Dip=84 Slip= 61 NP2: 114 29 168
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.