USGS Centroid Moment Solution

ANDREANOF ISLANDS, ALEUTIAN IS.

13/08/30 16:25:02.76

Epicenter:  51.610 -175.361
MW 6.9

USGS CENTROID MOMENT TENSOR
13/08/30 16:25:24.59
Centroid:  51.496 -175.240
Depth  33         No. of sta:159
Moment Tensor;   Scale 10**19 Nm
  Mrr= 3.07       Mtt=-2.51
  Mpp=-0.56       Mrt= 1.30
  Mrp= 0.74       Mtp=-0.91
 Principal axes:
  T  Val=  3.43  Plg=76  Azm=325
  N       -0.21       3       67
  P       -3.22      13      158

Best Double Couple:Mo=3.3*10**19
 NP1:Strike= 65 Dip=58 Slip=  87
 NP2:       252     32        95

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