USGS Body-Wave Moment Tensor Solution

ANDREANOF ISLANDS, ALEUTIAN IS.

13/08/30 16:25:02.76

Epicenter:  51.610 -175.361
MW 6.9

USGS MOMENT TENSOR SOLUTION
Depth  36         No. of sta:122
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.70       Mtt=-1.66
  Mpp=-0.04       Mrt= 1.62
  Mrp= 0.63       Mtp=-0.32
 Principal axes:
  T  Val=  2.44  Plg=67  Azm=331
  N       -0.01       5       74
  P       -2.43      23      166

Best Double Couple:Mo=2.4*10**19
 NP1:Strike= 72 Dip=68 Slip=  84
 NP2:       267     23       104

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