USGS WPhase Moment Solution
KURIL ISLANDS
12/ 9/ 9 5:39:20.00 Epicenter: 49.429 155.537 MW 6.0 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 9/ 9 5:39:20.00 Centroid: 49.329 155.844 Depth 60 No. of sta:105 Moment Tensor; Scale 10**17 Nm Mrr= 9.50 Mtt=-3.32 Mpp=-6.17 Mrt= 5.50 Mrp= 6.22 Mtp=-3.95 Principal axes: T Val= 12.71 Plg=68 Azm=315 N = -0.60 2 217 P =-12.11 20 126 Best Double Couple:Mo=1.2*10**18 NP1:Strike=211 Dip=24 Slip= 83 NP2: 39 66 93
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.
