USGS Body-Wave Moment Tensor Solution
SOUTH SANDWICH ISLANDS REGION
13/07/15 14:03:43.04 Epicenter: -60.868 -25.144 MW 7.1 USGS MOMENT TENSOR SOLUTION Depth 39 No. of sta: 17 Moment Tensor; Scale 10**19 Nm Mrr=-1.81 Mtt= 2.40 Mpp=-0.60 Mrt=-0.38 Mrp=-0.92 Mtp= 4.69 Principal axes: T Val= 5.92 Plg= 6 Azm=144 N -1.78 76 28 P -4.14 13 235 Best Double Couple:Mo=5.3*10**19 NP1:Strike=279 Dip=76 Slip= -5 NP2: 10 85 -166
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.