USGS Body-Wave Moment Tensor Solution
SOUTHEASTERN ALASKA
13/01/31 09:53:39.00 Epicenter: 55.405 -134.915 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 13 No. of sta: 59 Moment Tensor; Scale 10**17 Nm Mrr=-0.69 Mtt= 3.20 Mpp=-2.51 Mrt=-1.84 Mrp=-1.77 Mtp= 7.05 Principal axes: T Val= 8.63 Plg=15 Azm=146 N -1.34 74 341 P -7.29 4 237 Best Double Couple:Mo=8.0*10**17 NP1:Strike=282 Dip=76 Slip= 8 NP2: 190 82 166
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.
