USGS/SLU Regional Moment Solution
13/01/09 11:21:18.90 Epicenter: -24.268 -69.522 MW 4.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 103 No. of sta: 14 Moment Tensor; Scale 10**16 Nm Mrr=-1.81 Mtt=-0.20 Mpp= 2.02 Mrt=-0.79 Mrp= 0.84 Mtp=-1.03 Principal axes: T Val= 2.68 Plg=14 Azm=247 N -0.50 14 153 P -2.18 70 19 Best Double Couple:Mo=2.5*10**16 NP1:Strike=145 Dip=60 Slip=-106 NP2: 355 34 -64
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.