USGS Centroid Moment 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 CENTROID MOMENT TENSOR 11/03/06 14:32:50.50 Centroid: -56.390 -26.591 Depth 84 No. of sta:110 Moment Tensor; Scale 10**18 Nm Mrr= 2.80 Mtt= 1.42 Mpp=-4.22 Mrt=-5.25 Mrp= 4.94 Mtp= 1.48 Principal axes: T Val= 8.11 Plg=52 Azm=204 N 0.27 19 320 P -8.37 31 63 Best Double Couple:Mo=8.2*10**18 NP1:Strike=316 Dip=79 Slip= 70 NP2: 198 22 150
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.