USGS WPhase Moment Solution
SOUTHEASTERN ALASKA
13/01/31 9:53:43 Epicenter: 55.584 -134.745 MW 5.9 USGS/WPHASE CENTROID MOMENT TENSOR 13/01/31 09:53:43.00 Centroid: 55.384 -135.098 Depth 11 No. of sta: 82 Moment Tensor; Scale 10**17 Nm Mrr=-1.74 Mtt= 3.89 Mpp=-2.14 Mrt=-0.74 Mrp=-2.94 Mtp= 6.62 Principal axes: T Val= 8.64 Plg=12 Azm=145 N = -1.40 64 27 P = -7.24 21 240 Best Double Couple:Mo=8.0*10**17 NP1:Strike=281 Dip=65 Slip= -7 NP2: 14 84 -155
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.
