USGS Body-Wave Moment Tensor Solution
12/12/17 09:16:30.67 Epicenter: -0.677 123.811 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 29 No. of sta: 40 Moment Tensor; Scale 10**18 Nm Mrr=-0.17 Mtt= 1.81 Mpp=-1.65 Mrt=-0.01 Mrp= 0.73 Mtp= 0.83 Principal axes: T Val= 2.01 Plg= 4 Azm=346 N 0.09 69 245 P -2.10 20 78 Best Double Couple:Mo=2.1*10**18 NP1:Strike=120 Dip=73 Slip= -12 NP2: 214 79 -162
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.