USGS/SLU Regional Moment Solution
12/09/18 01:44:49 KODIAK ISLAND REGION, ALASKA Epicenter: 56.880 -154.080 MW 5.1 USGS/SLU REGIONAL MOMENT TENSOR Depth 42 No. of sta: 31 Moment Tensor; Scale 10**16 Nm Mrr=-0.40 Mtt=-4.23 Mpp= 4.62 Mrt=-1.86 Mrp= 1.86 Mtp= 0.98 Principal axes: T Val= 5.25 Plg=18 Azm=272 N 0.00 60 150 P -5.25 24 10 Best Double Couple:Mo=5.3*10**16 NP1:Strike=142 Dip=86 Slip=-150 NP2: 50 60 -5
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.