USGS/SLU Regional Moment Solution
HAIDA GWAII, CANADA
12/10/28 19:09:55.79 Epicenter: 52.352 -131.831 MW 5.5 USGS/SLU REGIONAL MOMENT TENSOR Depth 4 No. of sta: 21 Moment Tensor; Scale 10**17 Nm Mrr=-1.76 Mtt= 1.11 Mpp= 0.65 Mrt= 0.22 Mrp= 0.92 Mtp=-0.87 Principal axes: T Val= 1.83 Plg= 7 Azm=221 N 0.32 21 314 P -2.15 67 114 Best Double Couple:Mo=2.0*10**17 NP1:Strike=149 Dip=55 Slip= -64 NP2: 288 42 -123
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.