USGS Body-Wave Moment Tensor Solution
12/09/27 23:53:49.24 Epicenter: -8.824 157.539 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 4 No. of sta: 42 Moment Tensor; Scale 10**18 Nm Mrr= 0.11 Mtt=-0.03 Mpp=-0.08 Mrt= 0.60 Mrp=-0.86 Mtp= 0.11 Principal axes: T Val= 1.02 Plg=49 Azm= 56 N 0.06 1 325 P -1.08 41 234 Best Double Couple:Mo=1.1*10**18 NP1:Strike=315 Dip= 4 Slip= 80 NP2: 145 86 91
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.