USGS Body-Wave Moment Tensor Solution
BALLENY ISLANDS REGION
12/10/02 19:41:29.66 Epicenter: -65.000 177.927 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 9 Moment Tensor; Scale 10**17 Nm Mrr= 0.06 Mtt= 2.17 Mpp=-2.23 Mrt=-0.07 Mrp=-0.26 Mtp=-0.87 Principal axes: T Val= 2.34 Plg= 1 Azm=191 N 0.09 84 96 P -2.42 6 281 Best Double Couple:Mo=2.4*10**17 NP1:Strike=326 Dip=85 Slip= -4 NP2: 56 86 -175
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.