USGS WPhase Moment Solution
SOUTHEASTERN ALASKA
13/01/14 14:55:53 Epicenter: 55.158 -134.547 MW 5.5 USGS/WPHASE CENTROID MOMENT TENSOR 13/01/14 14:55:53.00 Centroid: 55.158 -134.547 Depth 11 No. of sta: 42 Moment Tensor; Scale 10**17 Nm Mrr= 0.03 Mtt=-1.44 Mpp= 1.41 Mrt= 1.12 Mrp= 0.38 Mtp= 1.17 Principal axes: T Val= 2.12 Plg=21 Azm=295 N = 0.14 57 63 P = -2.26 23 195 Best Double Couple:Mo=2.2*10**17 NP1:Strike=336 Dip=57 Slip=-178 NP2: 245 89 -32
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.
