USGS/SLU Regional Moment Solution
13/02/01 21:03:50.00 Epicenter: 65.515 -144.520 MW 3.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 15 No. of sta: 41 Moment Tensor; Scale 10**15 Nm Mrr= 0.12 Mtt=-0.72 Mpp= 0.60 Mrt= 0.31 Mrp= 0.63 Mtp=-0.41 Principal axes: T Val= 1.05 Plg=32 Azm=263 N -0.00 47 37 P -1.05 24 156 Best Double Couple:Mo=1.1*10**15 NP1:Strike=297 Dip=48 Slip= 173 NP2: 31 85 42
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.