USGS Centroid Moment Solution
SANTA CRUZ ISLANDS
13/02/06 01:12:26.96 Epicenter: -10.736 165.144 MW 7.9 USGS CENTROID MOMENT TENSOR 13/02/06 01:13:11.29 Centroid: -10.686 164.590 Depth 32 No. of sta:202 Moment Tensor; Scale 10**20 Nm Mrr= 6.23 Mtt=-2.42 Mpp=-3.81 Mrt= 1.26 Mrp=-4.74 Mtp= 2.80 Principal axes: T Val= 8.12 Plg=68 Azm= 88 N -0.59 10 331 P -7.53 19 237 Best Double Couple:Mo=7.8*10**20 NP1:Strike=311 Dip=28 Slip= 68 NP2: 156 64 101
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.
