USGS/SLU Regional Moment Solution
ANTOFAGASTA, CHILE
12/11/16 00:38:06.17 Epicenter: -21.482 -69.372 MW 4.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 59 No. of sta: 16 Moment Tensor; Scale 10**16 Nm Mrr= 3.14 Mtt=-2.59 Mpp=-0.55 Mrt= 0.15 Mrp= 0.08 Mtp=-1.45 Principal axes: T Val= 3.14 Plg=88 Azm=334 N 0.21 0 243 P -3.35 2 153 Best Double Couple:Mo=3.3*10**16 NP1:Strike= 63 Dip=47 Slip= 90 NP2: 243 44 90
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.
