USGS/SLU Regional Moment Solution
12/12/31 11:38:27.49 Epicenter: 61.654 -141.065 MW 4.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 16 No. of sta: 23 Moment Tensor; Scale 10**15 Nm Mrr= 0.38 Mtt=-0.84 Mpp= 0.46 Mrt=-1.14 Mrp=-0.54 Mtp= 0.29 Principal axes: T Val= 1.45 Plg=47 Azm=129 N 0.08 26 251 P -1.52 31 359 Best Double Couple:Mo=1.5*10**15 NP1:Strike=247 Dip=81 Slip= 63 NP2: 140 28 161
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.