USGS WPhase Moment Solution
VANCOUVER ISLAND, CANADA REGION
11/ 9/ 9 19:41:35.00 Epicenter: 49.474 -126.974 MW 6.4 USGS/WPHASE CENTROID MOMENT TENSOR 11/ 9/ 9 19:41:35.00 Centroid: 49.674 -126.820 Depth 19 No. of sta: 79 Moment Tensor; Scale 10**18 Nm Mrr=-1.68 Mtt=-1.28 Mpp= 2.95 Mrt= 1.05 Mrp=-1.81 Mtp= 3.89 Principal axes: T Val= 5.42 Plg= 8 Azm=118 N = -0.70 56 15 P = -4.72 31 214 Best Double Couple:Mo=5.1*10**18 NP1:Strike=252 Dip=61 Slip= -17 NP2: 351 75 -150
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.
