USGS Body-Wave Moment Tensor Solution
12/09/30 16:31:37.00 Epicenter: 1.953 -76.340 MW 7.2 USGS MOMENT TENSOR SOLUTION Depth 178 No. of sta: 85 Moment Tensor; Scale 10**19 Nm Mrr=-6.20 Mtt= 5.62 Mpp= 0.58 Mrt=-4.31 Mrp= 0.24 Mtp= 4.02 Principal axes: T Val= 8.77 Plg=14 Azm=154 N -0.88 18 249 P -7.89 66 29 Best Double Couple:Mo=8.4*10**19 NP1:Strike= 79 Dip=62 Slip= -69 NP2: 220 35 -124
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.