USGS/SLU Regional Moment Solution
13/08/17 02:45:48.01 Epicenter: -41.744 173.950 MW 4.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 5 No. of sta: 34 Moment Tensor; Scale 10**15 Nm Mrr=-0.08 Mtt=-0.08 Mpp= 0.17 Mrt=-0.21 Mrp=-0.47 Mtp=-0.99 Principal axes: T Val= 1.08 Plg=12 Azm= 51 N 0.08 63 165 P -1.16 24 316 Best Double Couple:Mo=1.1*10**15 NP1:Strike= 96 Dip=65 Slip=-171 NP2: 2 82 -26
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.