USGS Body-Wave Moment Tensor Solution
13/08/16 22:17:31.64 Epicenter: -28.607 -71.165 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 40 No. of sta: 19 Moment Tensor; Scale 10**17 Nm Mrr= 1.04 Mtt= 0.24 Mpp=-1.28 Mrt=-0.03 Mrp= 0.59 Mtp= 0.28 Principal axes: T Val= 1.18 Plg=76 Azm=280 N 0.28 5 171 P -1.47 13 80 Best Double Couple:Mo=1.4*10**17 NP1:Strike=354 Dip=58 Slip= 95 NP2: 164 32 81
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.