USGS WPhase Moment Solution

WESTERN SICHUAN, CHINA

13/01/18 12:42:50.8

Epicenter:  31.056   99.546
MW 5.4

USGS/WPHASE CENTROID MOMENT TENSOR
13/01/18 12:42:50.80
Centroid:   31.256   99.546
Depth  23         No. of sta:  8
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.03       Mtt= 1.08
  Mpp=-1.05       Mrt= 0.93
  Mrp=-0.34       Mtp= 0.63
 Principal axes:
  T  Val=  1.66  Plg=26  Azm=350
  N     = -0.17      51      120
  P     = -1.49      24      246

Best Double Couple:Mo=1.6*10**17
 NP1:Strike= 28 Dip=52 Slip= 178
 NP2:       119     89        38

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.