USGS/SLU Regional Moment Solution
13/09/03 20:19:06.31 Epicenter: 51.198 -130.405 MW 6.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 11 No. of sta: 6 Moment Tensor; Scale 10**18 Nm Mrr=-0.07 Mtt=-0.28 Mpp= 0.35 Mrt=-0.47 Mrp= 0.52 Mtp= 0.75 Principal axes: T Val= 0.89 Plg=14 Azm=298 N 0.30 55 186 P -1.19 31 37 Best Double Couple:Mo=1.1*10**18 NP1:Strike= 73 Dip=57 Slip= -13 NP2: 170 79 -146
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.