USGS WPhase Moment Solution
KURIL ISLANDS
13/ 3/ 1 13:20:50.00 Epicenter: 50.944 157.475 MW 6.5 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 3/ 1 13:20:50.00 Centroid: 50.744 157.634 Depth 40 No. of sta:295 Moment Tensor; Scale 10**18 Nm Mrr= 5.66 Mtt=-1.63 Mpp=-4.03 Mrt= 2.88 Mrp= 4.38 Mtp=-2.52 Principal axes: T Val= 7.72 Plg=68 Azm=304 N = -0.04 0 212 P = -7.68 21 122 Best Double Couple:Mo=7.7*10**18 NP1:Strike=211 Dip=23 Slip= 89 NP2: 33 66 91
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.
