USGS Body-Wave Moment Tensor Solution
OFF COAST OF WASHINGTON
12/08/19 08:07:36.00 Epicenter: 47.774 -128.588 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 42 Moment Tensor; Scale 10**17 Nm Mrr= 0.27 Mtt=-2.32 Mpp= 2.05 Mrt=-0.62 Mrp= 0.29 Mtp=-0.70 Principal axes: T Val= 2.24 Plg=11 Azm=260 N 0.31 74 126 P -2.55 11 352 Best Double Couple:Mo=2.4*10**17 NP1:Strike= 36 Dip=74 Slip= 0 NP2: 306 90 164
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.