USGS WPhase Moment Solution
OFF COAST OF OREGON
12/ 2/15 3:31:20.00 Epicenter: 43.535 -127.380 MW 5.8 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 2/15 3:31:20.00 Centroid: 43.535 -127.656 Depth 11 No. of sta: 18 Moment Tensor; Scale 10**17 Nm Mrr=-0.15 Mtt=-4.23 Mpp= 4.38 Mrt=-0.08 Mrp= 2.15 Mtp=-5.22 Principal axes: T Val= 7.37 Plg=14 Azm=245 N = -0.56 73 37 P = -6.80 7 153 Best Double Couple:Mo=7.1*10**17 NP1:Strike=289 Dip=74 Slip= 175 NP2: 20 85 16
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.
