USGS/SLU Regional Moment Solution
OFFSHORE VALPARAISO, CHILE
13/03/18 19:15:02.92 Epicenter: -32.475 -71.892 MW 4.6 USGS/SLU REGIONAL MOMENT TENSOR Depth 27 No. of sta: 18 Moment Tensor; Scale 10**16 Nm Mrr= 0.87 Mtt=-0.06 Mpp=-0.81 Mrt=-0.09 Mrp=-0.75 Mtp= 0.10 Principal axes: T Val= 1.17 Plg=68 Azm=105 N -0.07 6 359 P -1.10 21 267 Best Double Couple:Mo=1.1*10**16 NP1:Strike=346 Dip=25 Slip= 75 NP2: 182 66 97
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.