USGS WPhase Moment Solution
OFFSHORE O'HIGGINS, CHILE
12/11/21 21:36:22.00 Epicenter: -34.002 -71.956 MW 5.9 USGS/WPHASE CENTROID MOMENT TENSOR 12/11/21 21:36:22.00 Centroid: -34.302 -71.956 Depth 25 No. of sta: 26 Moment Tensor; Scale 10**17 Nm Mrr= 4.72 Mtt=-0.09 Mpp=-4.63 Mrt= 1.39 Mrp=-7.01 Mtp= 0.41 Principal axes: T Val= 8.59 Plg=61 Azm= 75 N = -0.09 2 170 P = -8.50 28 262 Best Double Couple:Mo=8.5*10**17 NP1:Strike=360 Dip=17 Slip= 99 NP2: 170 73 87
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.
