USGS WPhase Moment Solution

NORTHEAST OF TAIWAN

11/11/08  2:59: 6

Epicenter:  27.291  125.867
MW 6.9

USGS/WPHASE CENTROID MOMENT TENSOR
11/11/08 02:59: 6.00
Centroid:   27.191  125.755
Depth 230         No. of sta:109
Moment Tensor;   Scale 10**19 Nm
  Mrr=-2.58       Mtt= 0.09
  Mpp= 2.49       Mrt=-0.78
  Mrp=-1.07       Mtp=-0.65
 Principal axes:
  T  Val=  2.79  Plg= 9  Azm= 79
  N     =  0.26      17      172
  P     = -3.05      69      322

Best Double Couple:Mo=2.9*10**19
 NP1:Strike=149 Dip=39 Slip=-119
 NP2:         4     57       -68

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.