USGS WPhase Moment Solution
SANTA CRUZ ISLANDS REGION
13/ 2/ 7 0:30:11.00 Epicenter: -11.664 164.960 MW 6.0 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 7 0:30:11.00 Centroid: -11.764 164.858 Depth 11 No. of sta: 36 Moment Tensor; Scale 10**17 Nm Mrr=-8.80 Mtt= 2.75 Mpp= 6.04 Mrt= 3.13 Mrp=-5.26 Mtp=-4.14 Principal axes: T Val= 10.77 Plg=17 Azm= 56 N = -0.04 1 146 P =-10.72 72 242 Best Double Couple:Mo=1.1*10**18 NP1:Strike=144 Dip=28 Slip= -93 NP2: 328 62 -88
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.
