USGS WPhase Moment Solution

ANDREANOF ISLANDS, ALEUTIAN IS.

12/ 9/26 23:39:58.00

Epicenter:  51.583 -178.200
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/26 23:39:58.00
Centroid:   51.283 -178.200
Depth  23         No. of sta: 27
Moment Tensor;   Scale 10**18 Nm
  Mrr=-2.21       Mtt=-2.13
  Mpp= 4.35       Mrt= 1.33
  Mrp= 2.37       Mtp=-2.03
 Principal axes:
  T  Val=  5.44  Plg=14  Azm=257
  N     = -0.84      42        1
  P     = -4.59      43      152

Best Double Couple:Mo=5.1*10**18
 NP1:Strike=306 Dip=48 Slip=-155
 NP2:       199     72       -44

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.