USGS WPhase Moment Solution
VALPARAISO, CHILE
12/ 4/17 3:50:16.00 Epicenter: -32.701 -71.484 MW 6.7 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 4/17 3:50:16.00 Centroid: -32.801 -71.246 Depth 40 No. of sta: 27 Moment Tensor; Scale 10**19 Nm Mrr= 1.01 Mtt= 0.04 Mpp=-1.05 Mrt= 0.09 Mrp=-1.18 Mtp= 0.11 Principal axes: T Val= 1.54 Plg=65 Azm= 87 N = 0.05 0 355 P = -1.59 24 264 Best Double Couple:Mo=1.6*10**19 NP1:Strike=353 Dip=21 Slip= 87 NP2: 175 69 91
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.
