USGS/SLU Regional Moment Solution
SOUTHEASTERN ALASKA
13/01/05 12:28:27.00 Epicenter: 55.081 -134.695 MW 5.4 USGS/SLU REGIONAL MOMENT TENSOR Depth 16 No. of sta: 16 Moment Tensor; Scale 10**17 Nm Mrr= 0.11 Mtt=-1.04 Mpp= 0.93 Mrt=-0.09 Mrp=-0.86 Mtp= 0.77 Principal axes: T Val= 1.66 Plg=29 Azm=107 N -0.32 60 309 P -1.34 9 202 Best Double Couple:Mo=1.5*10**17 NP1:Strike=152 Dip=77 Slip= 152 NP2: 248 63 15
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.
