USGS Centroid Moment Solution
SOUTHEASTERN ALASKA
13/01/31 09:53:39.00 Epicenter: 55.405 -134.915 MW 5.9 USGS CENTROID MOMENT TENSOR 13/01/31 09:54:12.50 Centroid: 56.243 -135.275 Depth 26 No. of sta: 28 Moment Tensor; Scale 10**17 Nm Mrr=-1.22 Mtt= 3.75 Mpp=-2.53 Mrt= 1.71 Mrp= 1.23 Mtp= 7.86 Principal axes: T Val= 9.49 Plg=11 Azm=326 N -1.63 79 149 P -7.85 1 56 Best Double Couple:Mo=8.7*10**17 NP1:Strike= 10 Dip=83 Slip= 172 NP2: 101 82 8
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.
