USGS WPhase Moment Solution

OFF COAST OF OREGON

13/02/27 22:25:44

Epicenter:  43.152 -126.467
MW 5.2

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/27 22:25:44.00
Centroid:   43.152 -126.467
Depth  11         No. of sta: 27
Moment Tensor;   Scale 10**16 Nm
  Mrr=-1.40       Mtt=-5.35
  Mpp= 6.75       Mrt=-0.75
  Mrp=-2.68       Mtp=-3.99
 Principal axes:
  T  Val=  8.52  Plg=13  Azm= 74
  N     = -1.54      68      203
  P     = -6.97      15      340

Best Double Couple:Mo=7.9*10**16
 NP1:Strike=118 Dip=69 Slip=-178
 NP2:        27     88       -21

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.