USGS Body-Wave Moment Tensor Solution
OFFSHORE O'HIGGINS, CHILE
12/11/21 21:36:21.83 Epicenter: -33.988 -72.031 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 41 Moment Tensor; Scale 10**17 Nm Mrr= 4.66 Mtt=-1.48 Mpp=-3.17 Mrt= 1.05 Mrp=-4.77 Mtp= 1.36 Principal axes: T Val= 6.93 Plg=65 Azm= 84 N -0.88 6 341 P -6.05 24 248 Best Double Couple:Mo=6.5*10**17 NP1:Strike=324 Dip=22 Slip= 73 NP2: 163 69 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.