USGS Centroid Moment Solution
SANTA CRUZ ISLANDS
13/02/08 15:26:38.95 Epicenter: -10.917 165.977 MW 7.1 USGS CENTROID MOMENT TENSOR 13/02/08 15:27:06.00 Centroid: -10.451 166.136 Depth 34 No. of sta: 58 Moment Tensor; Scale 10**19 Nm Mrr= 0.29 Mtt= 0.30 Mpp=-0.59 Mrt=-0.11 Mrp=-1.55 Mtp=-4.94 Principal axes: T Val= 5.02 Plg=12 Azm= 44 N 0.35 73 176 P -5.37 12 311 Best Double Couple:Mo=5.2*10**19 NP1:Strike= 88 Dip=73 Slip=-180 NP2: 358 90 -17
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.
