USGS WPhase Moment Solution


12/10/21  6:55:09

Epicenter:  36.311 -120.856
MW 5.4

12/10/21 06:55: 9.00
Centroid:   36.211 -120.980
Depth  11         No. of sta: 74
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.15       Mtt=-1.18
  Mpp= 1.03       Mrt= 0.42
  Mrp= 0.48       Mtp= 0.78
 Principal axes:
  T  Val=  1.53  Plg=23  Azm=289
  N     = -0.06      64       84
  P     = -1.47       9      195

Best Double Couple:Mo=1.5*10**17
 NP1:Strike=330 Dip=66 Slip= 170
 NP2:        65     81        24

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.