USGS Body-Wave Moment Tensor Solution
SOUTH SHETLAND ISLANDS
12/01/15 13:40:16.65 Epicenter: -60.793 -55.729 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 2 No. of sta: 31 Moment Tensor; Scale 10**18 Nm Mrr= 0.45 Mtt= 4.84 Mpp=-5.29 Mrt=-2.12 Mrp= 1.37 Mtp= 1.40 Principal axes: T Val= 5.75 Plg=21 Azm=175 N 0.17 64 316 P -5.92 15 80 Best Double Couple:Mo=5.8*10**18 NP1:Strike=308 Dip=86 Slip= 26 NP2: 217 64 176
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.