USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 2/ 8 11:12:12.00 Epicenter: -10.925 165.874 MW 6.8 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 8 11:12:12.00 Centroid: -10.725 165.773 Depth 15 No. of sta: 41 Moment Tensor; Scale 10**19 Nm Mrr= 0.03 Mtt= 1.41 Mpp=-1.43 Mrt=-0.10 Mrp=-0.14 Mtp=-1.67 Principal axes: T Val= 2.18 Plg= 0 Azm=204 N = 0.04 85 103 P = -2.21 4 294 Best Double Couple:Mo=2.2*10**19 NP1:Strike=340 Dip=86 Slip= -2 NP2: 70 88 -176
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.
