USGS/SLU Regional Moment Solution
OFFSHORE VALPARAISO, CHILE
12/11/15 20:32:36.64 Epicenter: -32.657 -71.816 MW 4.5 USGS/SLU REGIONAL MOMENT TENSOR Depth 28 No. of sta: 15 Moment Tensor; Scale 10**15 Nm Mrr= 5.32 Mtt= 1.15 Mpp=-6.47 Mrt=-0.11 Mrp=-3.09 Mtp=-1.34 Principal axes: T Val= 6.09 Plg=76 Azm= 80 N 1.35 5 188 P -7.44 14 279 Best Double Couple:Mo=6.9*10**15 NP1:Strike=185 Dip=59 Slip= 85 NP2: 15 32 99
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.