USGS/SLU Regional Moment Solution
12/10/16 23:12:23.02 Epicenter: 43.586 -70.708 MW 4.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 7 No. of sta: 52 Moment Tensor; Scale 10**15 Nm Mrr= 1.29 Mtt=-0.12 Mpp=-1.18 Mrt=-0.30 Mrp= 0.51 Mtp= 0.33 Principal axes: T Val= 1.43 Plg=77 Azm=228 N -0.04 5 341 P -1.39 12 73 Best Double Couple:Mo=1.4*10**15 NP1:Strike=338 Dip=57 Slip= 84 NP2: 170 33 100
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.