USGS WPhase Moment Solution
12/11/12 20:42:14.00 Epicenter: 57.851 -142.906 MW 6.3 USGS/WPHASE CENTROID MOMENT TENSOR 12/11/12 20:42:14.00 Centroid: 57.751 -142.906 Depth 13 No. of sta: 47 Moment Tensor; Scale 10**18 Nm Mrr=-0.24 Mtt=-0.24 Mpp= 0.48 Mrt=-0.31 Mrp= 0.67 Mtp= 3.15 Principal axes: T Val= 3.32 Plg= 4 Azm=311 N = -0.11 76 201 P = -3.21 12 42 Best Double Couple:Mo=3.3*10**18 NP1:Strike= 86 Dip=77 Slip= -5 NP2: 177 84 -167
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.
