USGS Centroid Moment Solution

ANDREANOF ISLANDS, ALEUTIAN IS.

12/09/26 23:39:57.99

Epicenter:  51.630 -178.208
MW 6.4

USGS CENTROID MOMENT TENSOR
12/09/26 23:40:13.79
Centroid:  51.629 -178.313
Depth  22         No. of sta: 68
Moment Tensor;   Scale 10**18 Nm
  Mrr=-3.34       Mtt=-1.76
  Mpp= 5.10       Mrt= 1.22
  Mrp= 1.72       Mtp=-2.52
 Principal axes:
  T  Val=  6.10  Plg= 8  Azm=253
  N       -1.30      37      349
  P       -4.79      52      153

Best Double Couple:Mo=5.5*10**18
 NP1:Strike=309 Dip=49 Slip=-142
 NP2:       192     63       -47

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