USGS Body-Wave Moment Tensor Solution
ANDREANOF ISLANDS, ALEUTIAN IS.
12/09/26 23:39:57.73 Epicenter: 51.585 -178.231 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 128 Moment Tensor; Scale 10**18 Nm Mrr=-1.98 Mtt=-1.33 Mpp= 3.31 Mrt= 2.19 Mrp= 0.98 Mtp=-2.19 Principal axes: T Val= 4.18 Plg= 1 Azm=249 N 0.31 46 340 P -4.49 44 158 Best Double Couple:Mo=4.3*10**18 NP1:Strike=194 Dip=62 Slip= -35 NP2: 302 60 -147
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.