USGS WPhase Moment Solution

PACIFIC-ANTARCTIC RIDGE

13/01/09 21:46: 3

Epicenter: -57.058 -141.451
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
13/01/09 21:46: 3.00
Centroid:  -57.458 -141.818
Depth  11         No. of sta: 10
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.53       Mtt= 2.46
  Mpp=-1.92       Mrt=-0.37
  Mrp= 1.06       Mtp= 1.26
 Principal axes:
  T  Val=  2.80  Plg= 1  Azm=165
  N     =  0.01      63      258
  P     = -2.81      26       74

Best Double Couple:Mo=2.8*10**17
 NP1:Strike=210 Dip=43 Slip=-178
 NP2:       118     89       -46

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.