USGS Body-Wave Moment Tensor Solution
BALLENY ISLANDS REGION
12/10/09 12:32:10.14 Epicenter: -60.284 153.499 MW 6.3 USGS MOMENT TENSOR SOLUTION Depth 15 No. of sta: 19 Moment Tensor; Scale 10**18 Nm Mrr= 0.62 Mtt= 3.21 Mpp=-3.83 Mrt=-1.07 Mrp= 1.87 Mtp= 0.14 Principal axes: T Val= 3.64 Plg=22 Azm=185 N 0.91 59 317 P -4.55 21 86 Best Double Couple:Mo=4.2*10**18 NP1:Strike=316 Dip=89 Slip= 31 NP2: 225 59 179
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.