USGS Centroid Moment Solution
SOUTHEASTERN ALASKA
13/01/05 08:58:18.75 Epicenter: 55.458 -134.543 MW 7.5 USGS CENTROID MOMENT TENSOR 13/01/05 08:58:43.20 Centroid: 55.682 -135.086 Depth 10 No. of sta:164 Moment Tensor; Scale 10**20 Nm Mrr= 0.02 Mtt=-1.75 Mpp= 1.73 Mrt= 1.07 Mrp= 1.04 Mtp= 1.26 Principal axes: T Val= 2.79 Plg=26 Azm=292 N -0.40 57 71 P -2.40 19 192 Best Double Couple:Mo=2.6*10**20 NP1:Strike= 63 Dip=85 Slip= 33 NP2: 330 57 174
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.
