USGS WPhase Moment Solution


12/10/21  1:25:23

Epicenter:  66.328  -18.751
MW 5.5

12/10/21 01:25:23.00
Centroid:   66.228  -19.000
Depth  11         No. of sta: 33
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.88       Mtt= 0.03
  Mpp= 1.85       Mrt= 0.78
  Mrp=-0.07       Mtp=-0.59
 Principal axes:
  T  Val=  2.05  Plg= 4  Azm= 72
  N     =  0.11      19      340
  P     = -2.16      69      174

Best Double Couple:Mo=2.1*10**17
 NP1:Strike=182 Dip=44 Slip= -61
 NP2:       325     52      -115

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.