USGS/SLU Regional Moment Solution
12/11/30 14:27:05.00 Epicenter: 61.354 -151.491 MW 4.1 USGS/SLU REGIONAL MOMENT TENSOR Depth 78 No. of sta: 17 Moment Tensor; Scale 10**15 Nm Mrr=-0.27 Mtt=-0.29 Mpp= 0.57 Mrt=-0.96 Mrp= 1.44 Mtp=-0.09 Principal axes: T Val= 1.86 Plg=39 Azm=247 N -0.12 12 147 P -1.74 49 44 Best Double Couple:Mo=1.8*10**15 NP1:Strike=146 Dip=85 Slip=-102 NP2: 32 13 -25
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.