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

Moment Tensor Solution
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.

Moment Tensor Solution

Details on the W-phase inversion algorithm.