USGS Body-Wave Moment Tensor Solution
OFF COAST OF OREGON
12/02/15 03:31:20.09 Epicenter: 43.615 -127.512 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 10 No. of sta: 27 Moment Tensor; Scale 10**17 Nm Mrr=-0.60 Mtt=-3.06 Mpp= 3.67 Mrt=-1.72 Mrp= 0.72 Mtp=-3.73 Principal axes: T Val= 5.63 Plg=13 Azm=244 N -0.53 69 119 P -5.10 16 338 Best Double Couple:Mo=5.4*10**17 NP1:Strike=112 Dip=87 Slip=-159 NP2: 21 69 -3
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.