USGS Body-Wave Moment Tensor Solution
12/11/16 18:12:39.93 Epicenter: 49.273 155.478 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 35 No. of sta: 88 Moment Tensor; Scale 10**18 Nm Mrr= 4.37 Mtt=-1.98 Mpp=-2.39 Mrt= 1.30 Mrp= 1.91 Mtp=-1.45 Principal axes: T Val= 4.99 Plg=75 Azm=301 N -0.73 2 39 P -4.26 15 130 Best Double Couple:Mo=4.7*10**18 NP1:Strike= 38 Dip=60 Slip= 87 NP2: 223 30 94
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.