USGS WPhase Moment Solution
ANDREANOF ISLANDS, ALEUTIAN IS.
12/ 9/26 23:39:58.00 Epicenter: 51.583 -178.200 MW 6.4 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 9/26 23:39:58.00 Centroid: 51.283 -178.200 Depth 23 No. of sta: 27 Moment Tensor; Scale 10**18 Nm Mrr=-2.21 Mtt=-2.13 Mpp= 4.35 Mrt= 1.33 Mrp= 2.37 Mtp=-2.03 Principal axes: T Val= 5.44 Plg=14 Azm=257 N = -0.84 42 1 P = -4.59 43 152 Best Double Couple:Mo=5.1*10**18 NP1:Strike=306 Dip=48 Slip=-155 NP2: 199 72 -44
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.
