USGS Body-Wave Moment Tensor Solution

FOX ISLANDS, ALEUTIAN ISLANDS

11/09/02 10:55:55.54

Epicenter:  52.196 -171.656
MW 6.8

USGS MOMENT TENSOR SOLUTION
Depth  34         No. of sta: 103
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.86       Mtt= 0.75
  Mpp=-1.60       Mrt= 0.52
  Mrp= 0.84       Mtp= 0.57
 Principal axes:
  T  Val=  1.63  Plg=47  Azm=334
  N        0.29      39      184
  P       -1.92      15       81

Best Double Couple:Mo=1.8*10**19
 NP1:Strike=131 Dip=46 Slip=  28
 NP2:        20     71      1320

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