USGS Body-Wave Moment Tensor Solution
11/09/15 19:31:02.75 Epicenter: -21.559 -179.368 MW 7.3 USGS MOMENT TENSOR SOLUTION Depth 629 No. of sta: 69 Moment Tensor; Scale 10**20 Nm Mrr=-0.17 Mtt= 0.75 Mpp=-0.58 Mrt=-0.53 Mrp=-0.60 Mtp=-0.11 Principal axes: T Val= 1.01 Plg=27 Azm=173 N 0.09 40 57 P -1.10 38 286 Best Double Couple:Mo=1.1*10**20 NP1:Strike=314 Dip=41 Slip= -10 NP2: 52 84 -130
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.