USGS Body-Wave Moment Tensor Solution
11/08/30 06:57:41.51 Epicenter: -6.398 126.790 MW 6.9 USGS MOMENT TENSOR SOLUTION Depth 461 No. of sta: 44 Moment Tensor; Scale 10**19 Nm Mrr=-0.81 Mtt= 0.02 Mpp= 0.78 Mrt= 0.80 Mrp= 2.23 Mtp=-0.18 Principal axes: T Val= 2.40 Plg=36 Azm=280 N 0.20 9 16 P -2.60 53 117 Best Double Couple:Mo=2.5*10**19 NP1:Strike=197 Dip=82 Slip= -81 NP2: 331 12 -135
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.