USGS WPhase Moment Solution
VALPARAISO, CHILE
12/10/11 17:22:10.00 Epicenter: -32.867 -70.401 MW 5.5 USGS/WPHASE CENTROID MOMENT TENSOR 12/10/11 17:22:10.00 Centroid: -32.967 -70.520 Depth 120 No. of sta: 22 Moment Tensor; Scale 10**17 Nm Mrr= 0.05 Mtt=-1.51 Mpp= 1.46 Mrt=-0.21 Mrp= 0.26 Mtp= 1.93 Principal axes: T Val= 2.42 Plg= 3 Azm=295 N = 0.07 82 179 P = -2.49 6 26 Best Double Couple:Mo=2.5*10**17 NP1:Strike= 71 Dip=83 Slip= -2 NP2: 161 88 -172
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.
