USGS Body-Wave Moment Tensor Solution
HAIDA GWAII REGION, CANADA
13/09/03 20:19:06.91 Epicenter: 51.226 -130.447 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 77 Moment Tensor; Scale 10**18 Nm Mrr=-0.20 Mtt=-0.25 Mpp= 0.45 Mrt= 0.14 Mrp=-0.15 Mtp= 0.96 Principal axes: T Val= 1.13 Plg= 2 Azm=125 N -0.15 75 28 P -0.98 15 215 Best Double Couple:Mo=1.1*10**18 NP1:Strike=351 Dip=81 Slip=-168 NP2: 259 78 -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.