USGS/SLU Regional Moment Solution
12/10/30 22:02:46.00 Epicenter: 61.496 -150.723 MW 4.4 USGS/SLU REGIONAL MOMENT TENSOR Depth 66 No. of sta: 75 Moment Tensor; Scale 10**15 Nm Mrr=-4.19 Mtt=-0.03 Mpp= 4.22 Mrt= 1.81 Mrp= 2.85 Mtp=-0.49 Principal axes: T Val= 5.10 Plg=17 Azm=271 N 0.59 17 6 P -5.69 65 139 Best Double Couple:Mo=5.4*10**15 NP1:Strike=336 Dip=32 Slip=-124 NP2: 195 64 -71
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.