USGS Centroid Moment Solution
12/09/09 05:39:36.48 Epicenter: 49.268 155.730 MW 6.0 USGS CENTROID MOMENT TENSOR 12/09/09 05:39:51.79 Centroid: 49.972 155.722 Depth 47 No. of sta: 86 Moment Tensor; Scale 10**18 Nm Mrr= 1.22 Mtt=-0.44 Mpp=-0.78 Mrt=-0.15 Mrp= 0.40 Mtp=-0.57 Principal axes: T Val= 1.34 Plg=74 Azm=236 N -0.11 14 34 P -1.23 6 125 Best Double Couple:Mo=1.3*10**18 NP1:Strike= 22 Dip=52 Slip= 72 NP2: 231 41 112
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.
