USGS WPhase Moment Solution
BALLENY ISLANDS REGION
12/10/ 9 12:32:4.00 Epicenter: -61.033 153.959 MW 6.6 USGS/WPHASE CENTROID MOMENT TENSOR 12/10/ 9 12:32: 4.00 Centroid: -60.733 153.133 Depth 11 No. of sta: 17 Moment Tensor; Scale 10**18 Nm Mrr=-1.26 Mtt= 8.19 Mpp=-6.93 Mrt= 3.95 Mrp= 3.21 Mtp=-6.64 Principal axes: T Val= 11.26 Plg=12 Azm= 17 N = 0.14 62 262 P =-11.40 24 113 Best Double Couple:Mo=1.1*10**19 NP1:Strike=154 Dip=64 Slip= -8 NP2: 247 82 -153
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.
