USGS Body-Wave Moment Tensor Solution
12/12/17 00:28:55.82 Epicenter: 49.749 155.952 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 41 No. of sta: 88 Moment Tensor; Scale 10**17 Nm Mrr= 3.05 Mtt=-1.52 Mpp=-1.53 Mrt= 0.60 Mrp= 0.95 Mtp=-1.36 Principal axes: T Val= 3.26 Plg=79 Azm=293 N -0.18 4 43 P -3.08 10 134 Best Double Couple:Mo=3.2*10**17 NP1:Strike= 41 Dip=55 Slip= 85 NP2: 229 35 97
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.