USGS/SLU Regional Moment Solution
VIRGIN ISLANDS REGION
13/01/10 16:33:36.92 Epicenter: 19.523 -64.458 MW 5.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 9 No. of sta: 24 Moment Tensor; Scale 10**16 Nm Mrr= 2.77 Mtt=-1.51 Mpp=-1.26 Mrt= 0.69 Mrp= 0.50 Mtp= 2.79 Principal axes: T Val= 3.17 Plg=64 Azm=316 N 1.01 25 133 P -4.19 1 224 Best Double Couple:Mo=3.8*10**16 NP1:Strike=111 Dip=51 Slip= 57 NP2: 337 49 125
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.