USGS/SLU Regional Moment Solution
13/09/05 20:12:02.11 Epicenter: 69.005 -144.665 MW 3.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 10 No. of sta: 11 Moment Tensor; Scale 10**14 Nm Mrr= 1.87 Mtt=-8.69 Mpp= 6.81 Mrt= 0.99 Mrp= 0.26 Mtp=-4.26 Principal axes: T Val= 7.91 Plg= 0 Azm=256 N 1.96 85 346 P -9.87 5 166 Best Double Couple:Mo=9.1*10**14 NP1:Strike=301 Dip=86 Slip=-177 NP2: 211 87 -4
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.