USGS Centroid Moment Solution
ATACAMA, CHILE
13/01/30 20:15:42.95 Epicenter: -28.180 -70.785 MW 6.7 USGS CENTROID MOMENT TENSOR 13/01/30 20:15:57.79 Centroid: -28.329 -70.749 Depth 42 No. of sta:142 Moment Tensor; Scale 10**19 Nm Mrr= 1.31 Mtt=-0.00 Mpp=-1.30 Mrt= 0.16 Mrp=-0.98 Mtp=-0.17 Principal axes: T Val= 1.66 Plg=70 Azm= 69 N -0.02 8 182 P -1.64 18 274 Best Double Couple:Mo=1.6*10**19 NP1:Strike= 17 Dip=28 Slip= 107 NP2: 178 64 81
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.
