USGS Body-Wave Moment Tensor Solution
12/11/10 14:57:50.00 Epicenter: -8.880 -75.070 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 119 No. of sta: 56 Moment Tensor; Scale 10**18 Nm Mrr=-1.04 Mtt= 0.03 Mpp= 1.01 Mrt=-0.02 Mrp= 0.31 Mtp= 0.30 Principal axes: T Val= 1.14 Plg= 8 Azm=285 N -0.05 6 194 P -1.09 81 68 Best Double Couple:Mo=1.1*10**18 NP1:Strike=190 Dip=53 Slip= -97 NP2: 21 38 -81
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.