USGS WPhase Moment Solution

TAIWAN

13/ 3/27  2: 3:20.00

Epicenter:  23.839  121.134
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 3/27  2: 3:20.00
Centroid:   23.739  121.134
Depth  21         No. of sta: 25
Moment Tensor;   Scale 10**17 Nm
  Mrr= 5.93       Mtt=-0.69
  Mpp=-5.24       Mrt=-3.09
  Mrp=-5.10       Mtp=-1.52
 Principal axes:
  T  Val=  8.53  Plg=66  Azm=129
  N     = -0.41       6       24
  P     = -8.12      22      291

Best Double Couple:Mo=8.3*10**17
 NP1:Strike=  8 Dip=23 Slip=  73
 NP2:       207     68        97

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.