USGS WPhase Moment Solution

OFF COAST OF OREGON

12/ 2/15  3:31:20.00

Epicenter:  43.535 -127.380
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 2/15  3:31:20.00
Centroid:   43.535 -127.656
Depth  11         No. of sta: 18
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.15       Mtt=-4.23
  Mpp= 4.38       Mrt=-0.08
  Mrp= 2.15       Mtp=-5.22
 Principal axes:
  T  Val=  7.37  Plg=14  Azm=245
  N     = -0.56      73       37
  P     = -6.80       7      153

Best Double Couple:Mo=7.1*10**17
 NP1:Strike=289 Dip=74 Slip= 175
 NP2:        20     85        16

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.