USGS WPhase Moment Solution

KURIL ISLANDS

13/04/20 13:12:51

Epicenter:  50.139  157.224
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
13/04/20 13:12:51.00
Centroid:   49.839  157.536
Depth  30         No. of sta:240
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.93       Mtt=-0.24
  Mpp=-0.69       Mrt= 0.76
  Mrp= 1.28       Mtp=-0.42
 Principal axes:
  T  Val=  1.75  Plg=61  Azm=300
  N     =  0.01       0       30
  P     = -1.76      28      120

Best Double Couple:Mo=1.8*10**18
 NP1:Strike=211 Dip=16 Slip=  90
 NP2:        31     74        90

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.