USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 2/ 7 18:59:16.00 Epicenter: -11.001 165.658 MW 6.7 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 7 18:59:16.00 Centroid: -10.801 165.556 Depth 11 No. of sta: 53 Moment Tensor; Scale 10**19 Nm Mrr=-0.25 Mtt= 0.26 Mpp=-0.02 Mrt=-0.69 Mrp=-0.19 Mtp=-1.20 Principal axes: T Val= 1.43 Plg=14 Azm=218 N = -0.02 57 104 P = -1.41 28 316 Best Double Couple:Mo=1.4*10**19 NP1:Strike=354 Dip=59 Slip= -10 NP2: 89 81 -148
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.
