USGS Centroid Moment Solution
FOX ISLANDS, ALEUTIAN ISLANDS
11/09/02 10:55:55.54 Epicenter: 52.196 -171.656 MW 6.8 USGS CENTROID MOMENT TENSOR 11/09/02 10:56:13.40 Centroid: 52.124 -171.788 Depth 43 No. of sta: 73 Moment Tensor; Scale 10**19 Nm Mrr= 1.20 Mtt= 0.61 Mpp=-1.81 Mrt= 0.73 Mrp= 1.02 Mtp= 0.76 Principal axes: T Val= 2.10 Plg=52 Azm=330 N 0.11 35 179 P -2.22 14 79 Best Double Couple:Mo=2.2*10**19 NP1:Strike= 15 Dip=67 Slip= 128 NP2: 131 43 34
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.
