USGS WPhase Moment Solution


12/ 9/20 21: 3:40.00

Epicenter: -20.753 -178.372
MW 5.7

12/ 9/20 21: 3:40.00
Centroid:  -20.753 -178.265
Depth 580         No. of sta: 22
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.38       Mtt= 0.37
  Mpp= 1.01       Mrt=-3.17
  Mrp=-0.06       Mtp=-1.65
 Principal axes:
  T  Val=  3.48  Plg=28  Azm=213
  N     =  0.54      27      107
  P     = -4.02      48      341

Best Double Couple:Mo=3.8*10**17
 NP1:Strike=351 Dip=30 Slip= -23
 NP2:       101     79      -117

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.