USGS WPhase Moment Solution


11/09/18 12:40:48

Epicenter:  27.729   88.082
MW 6.9

11/09/18 12:40:48.00
Centroid:   27.529   87.969
Depth  60         No. of sta: 71
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.54       Mtt=-2.01
  Mpp= 2.55       Mrt= 0.44
  Mrp=-0.39       Mtp=-0.63
 Principal axes:
  T  Val=  2.69  Plg= 7  Azm= 81
  N     = -0.51      74      321
  P     = -2.19      13      173

Best Double Couple:Mo=2.5*10**19
 NP1:Strike=217 Dip=75 Slip=  -4
 NP2:       308     86      -164

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.