USGS WPhase Moment Solution

OFF COAST OF OREGON

13/01/30  3:14:28

Epicenter:  43.566 -127.598
MW 5.4

USGS/WPHASE CENTROID MOMENT TENSOR
13/01/30 03:14:28.00
Centroid:   43.466 -127.598
Depth  11         No. of sta: 71
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.05       Mtt=-0.92
  Mpp= 0.87       Mrt=-0.02
  Mrp= 0.16       Mtp=-1.00
 Principal axes:
  T  Val=  1.34  Plg= 6  Azm=246
  N     =  0.03      82       51
  P     = -1.37       1      155

Best Double Couple:Mo=1.4*10**17
 NP1:Strike=291 Dip=84 Slip= 176
 NP2:        21     86         6

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.