USGS Body-Wave Moment Tensor Solution
12/11/28 03:09:49.71 Epicenter: -4.493 -76.095 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 114 No. of sta: 43 Moment Tensor; Scale 10**17 Nm Mrr=-3.95 Mtt=-0.12 Mpp= 4.08 Mrt=-1.04 Mrp=-0.50 Mtp=-1.21 Principal axes: T Val= 4.40 Plg= 2 Azm= 75 N -0.11 16 166 P -4.29 74 340 Best Double Couple:Mo=4.3*10**17 NP1:Strike=149 Dip=46 Slip=-113 NP2: 1 49 -68
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.