USGS WPhase Moment Solution

SICHUAN-YUNNAN-GUIZHOU RG, CHINA

12/ 9/ 7  3:19:42.00

Epicenter:  27.507  103.928
MW 5.5

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/ 7  3:19:42.00
Centroid:   27.307  104.491
Depth  11         No. of sta: 34
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.67       Mtt=-0.25
  Mpp=-1.42       Mrt=-0.90
  Mrp=-0.98       Mtp=-0.84
 Principal axes:
  T  Val=  2.14  Plg=69  Azm=146
  N     =  0.14       8       33
  P     = -2.28      18      300

Best Double Couple:Mo=2.2*10**17
 NP1:Strike= 17 Dip=28 Slip=  72
 NP2:       217     64        99

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.