USGS WPhase Moment Solution
12/10/28 3:04: 8 Epicenter: 52.774 -131.843 MW 7.8 USGS/WPHASE CENTROID MOMENT TENSOR 12/10/28 03:04: 8.00 Centroid: 52.674 -131.843 Depth 15 No. of sta:247 Moment Tensor; Scale 10**20 Nm Mrr= 4.00 Mtt=-2.39 Mpp=-1.61 Mrt= 4.85 Mrp=-2.81 Mtp= 2.08 Principal axes: T Val= 6.90 Plg=62 Azm= 24 N = 0.04 4 123 P = -6.94 27 215 Best Double Couple:Mo=6.9*10**20 NP1:Strike=317 Dip=18 Slip= 105 NP2: 122 72 85
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.
