USGS WPhase Moment Solution
OAXACA, MEXICO
12/ 3/20 18: 2:48.00 Epicenter: 16.662 -98.187 MW 7.4 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 3/20 18: 2:48.00 Centroid: 16.462 -97.874 Depth 15 No. of sta: 59 Moment Tensor; Scale 10**20 Nm Mrr= 0.64 Mtt=-0.53 Mpp=-0.11 Mrt= 1.08 Mrp=-0.73 Mtp= 0.20 Principal axes: T Val= 1.47 Plg=57 Azm= 38 N = -0.05 4 301 P = -1.42 32 209 Best Double Couple:Mo=1.4*10**20 NP1:Strike=283 Dip=13 Slip= 71 NP2: 123 77 95
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.
