USGS/SLU Regional Moment Solution
HAIDA GWAII, CANADA
12/10/28 23:34:23.73 Epicenter: 52.577 -132.249 MW 4.7 USGS/SLU REGIONAL MOMENT TENSOR Depth 8 No. of sta: 12 Moment Tensor; Scale 10**16 Nm Mrr=-0.55 Mtt= 0.22 Mpp= 0.33 Mrt=-0.05 Mrp= 1.36 Mtp=-0.12 Principal axes: T Val= 1.34 Plg=36 Azm=262 N 0.21 5 355 P -1.55 54 92 Best Double Couple:Mo=1.5*10**16 NP1:Strike=329 Dip=10 Slip=-117 NP2: 176 81 -85
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.