USGS WPhase Moment Solution
SOUTHEASTERN ALASKA
13/01/05 8:58:19 Epicenter: 55.291 -134.727 MW 7.5 USGS/WPHASE CENTROID MOMENT TENSOR 13/01/05 08:58:19.00 Centroid: 55.891 -134.906 Depth 11 No. of sta:106 Moment Tensor; Scale 10**20 Nm Mrr= 0.04 Mtt=-1.56 Mpp= 1.52 Mrt= 0.93 Mrp= 0.41 Mtp= 1.26 Principal axes: T Val= 2.21 Plg=19 Azm=293 N = 0.05 62 65 P = -2.25 18 196 Best Double Couple:Mo=2.2*10**20 NP1:Strike=335 Dip=63 Slip= 180 NP2: 65 90 27
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.
