USGS WPhase Moment Solution
OFF COAST OF OREGON
13/02/27 22:25:44 Epicenter: 43.152 -126.467 MW 5.2 USGS/WPHASE CENTROID MOMENT TENSOR 13/02/27 22:25:44.00 Centroid: 43.152 -126.467 Depth 11 No. of sta: 27 Moment Tensor; Scale 10**16 Nm Mrr=-1.40 Mtt=-5.35 Mpp= 6.75 Mrt=-0.75 Mrp=-2.68 Mtp=-3.99 Principal axes: T Val= 8.52 Plg=13 Azm= 74 N = -1.54 68 203 P = -6.97 15 340 Best Double Couple:Mo=7.9*10**16 NP1:Strike=118 Dip=69 Slip=-178 NP2: 27 88 -21
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.