USGS WPhase Moment Solution


13/01/09  1:41:52

Epicenter:  25.340   94.970
MW 5.8

13/01/09 01:41:52.00
Centroid:   25.240   94.970
Depth 100         No. of sta: 42
Moment Tensor;   Scale 10**17 Nm
  Mrr= 5.39       Mtt=-4.43
  Mpp=-0.96       Mrt= 0.26
  Mrp=-2.52       Mtp= 2.59
 Principal axes:
  T  Val=  6.31  Plg=69  Azm= 99
  N     = -0.31      19      303
  P     = -6.00       7      210

Best Double Couple:Mo=6.2*10**17
 NP1:Strike=280 Dip=41 Slip=  60
 NP2:       137     55       113

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.