USGS WPhase Moment Solution

TAIWAN

13/03/07  3:36:47

Epicenter:  24.267  121.428
MW 5.5

USGS/WPHASE CENTROID MOMENT TENSOR
13/03/07 03:36:47.00
Centroid:   24.367  121.538
Depth  11         No. of sta: 19
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.72       Mtt= 0.58
  Mpp= 1.14       Mrt= 1.04
  Mrp= 0.82       Mtp=-1.00
 Principal axes:
  T  Val=  1.89  Plg= 0  Azm=233
  N     =  0.59      29      323
  P     = -2.48      60      142

Best Double Couple:Mo=2.2*10**17
 NP1:Strike=296 Dip=52 Slip=-129
 NP2:       169     53       -51

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.