USGS/SLU Regional Moment Solution
13/01/10 16:33:35.17 Epicenter: 19.493 -64.460 MW 5.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 9 No. of sta: 21 Moment Tensor; Scale 10**16 Nm Mrr= 2.75 Mtt=-1.64 Mpp=-1.11 Mrt= 0.78 Mrp= 0.58 Mtp= 2.76 Principal axes: T Val= 3.24 Plg=63 Azm=315 N 0.91 27 131 P -4.15 2 222 Best Double Couple:Mo=3.8*10**16 NP1:Strike=108 Dip=52 Slip= 55 NP2: 337 50 127
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.