USGS Body-Wave Moment Tensor Solution
12/04/17 03:50:17.58 Epicenter: -32.664 -71.483 MW 6.6 USGS MOMENT TENSOR SOLUTION Depth 40 No. of sta: 101 Moment Tensor; Scale 10**18 Nm Mrr= 5.94 Mtt= 0.29 Mpp=-6.23 Mrt= 2.23 Mrp=-6.82 Mtp=-0.77 Principal axes: T Val= 9.59 Plg=62 Azm= 58 N -0.30 12 173 P -9.29 24 269 Best Double Couple:Mo=9.4*10**18 NP1:Strike= 23 Dip=23 Slip= 123 NP2: 168 70 77
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.