USGS WPhase Moment Solution

WESTERN SICHUAN, CHINA

13/ 4/20  0: 2:48.00

Epicenter:  30.313  102.933
MW 6.6

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 4/20  0: 2:48.00
Centroid:   30.313  103.049
Depth  11         No. of sta: 83
Moment Tensor;   Scale 10**18 Nm
  Mrr= 9.65       Mtt=-2.76
  Mpp=-6.89       Mrt=-0.33
  Mrp= 2.57       Mtp=-3.59
 Principal axes:
  T  Val= 10.10  Plg=79  Azm=246
  N     = -0.90       8       27
  P     = -9.20       6      118

Best Double Couple:Mo=9.7*10**18
 NP1:Strike=218 Dip=39 Slip= 103
 NP2:        22     52        80

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.