USGS Body-Wave Moment Tensor Solution
VANCOUVER ISLAND, CANADA REGION
11/09/09 19:41:34.68 Epicenter: 49.493 -126.967 MW 6.3 USGS MOMENT TENSOR SOLUTION Depth 15 No. of sta: 60 Moment Tensor; Scale 10**18 Nm Mrr=-0.07 Mtt=-0.77 Mpp= 0.83 Mrt= 0.15 Mrp=-1.25 Mtp= 3.48 Principal axes: T Val= 3.81 Plg=13 Azm=127 N -0.05 71 355 P -3.76 14 220 Best Double Couple:Mo=3.8*10**18 NP1:Strike=263 Dip=71 Slip= -1 NP2: 354 89 -161
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.