USGS Body-Wave Moment Tensor Solution
SOUTH SANDWICH ISLANDS REGION
11/03/06 14:32:35.96 SOUTH SANDWICH ISLANDS REGION Epicenter: -56.387 -27.019 MW 6.5 USGS MOMENT TENSOR SOLUTION Depth 86 No. of sta: 41 Moment Tensor; Scale 10**18 Nm Mrr= 4.16 Mtt=-1.85 Mpp=-2.30 Mrt=-3.70 Mrp= 3.96 Mtp= 1.92 Principal axes: T Val= 6.86 Plg=63 Azm=226 N -0.14 1 317 P -6.71 26 48 Best Double Couple:Mo=6.8*10**18 NP1:Strike=317 Dip=72 Slip= 89 NP2: 139 19 92
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 form 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.