USGS WPhase Moment Solution
ATACAMA, CHILE
13/ 1/30 20:15:43.00 Epicenter: -28.168 -70.803 MW 6.8 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 1/30 20:15:43.00 Centroid: -28.068 -70.803 Depth 50 No. of sta: 62 Moment Tensor; Scale 10**19 Nm Mrr= 1.33 Mtt= 0.03 Mpp=-1.36 Mrt= 0.26 Mrp=-1.01 Mtp=-0.22 Principal axes: T Val= 1.73 Plg=68 Azm= 59 N = -0.02 11 180 P = -1.71 18 274 Best Double Couple:Mo=1.7*10**19 NP1:Strike= 22 Dip=29 Slip= 114 NP2: 175 64 77
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.
