USGS Body-Wave Moment Tensor Solution
OFF COAST OF OREGON
13/02/27 22:25:44.07 Epicenter: 43.115 -126.443 MW 5.2 USGS MOMENT TENSOR SOLUTION Depth 9 No. of sta: 9 Moment Tensor; Scale 10**16 Nm Mrr=-0.15 Mtt=-3.42 Mpp= 3.57 Mrt=-3.06 Mrp=-0.45 Mtp=-5.41 Principal axes: T Val= 6.70 Plg=10 Azm=239 N 0.82 66 126 P -7.52 22 333 Best Double Couple:Mo=7.2*10**16 NP1:Strike=108 Dip=82 Slip=-157 NP2: 14 68 -9
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.