USGS Body-Wave Moment Tensor Solution
12/11/17 02:51:24.11 Epicenter: -15.026 167.426 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 116 No. of sta: 34 Moment Tensor; Scale 10**17 Nm Mrr= 3.98 Mtt= 0.71 Mpp=-4.69 Mrt=-0.50 Mrp= 1.34 Mtp=-0.38 Principal axes: T Val= 4.27 Plg=78 Azm=225 N 0.64 9 2 P -4.91 8 93 Best Double Couple:Mo=4.6*10**17 NP1:Strike=355 Dip=54 Slip= 79 NP2: 194 37 105
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.