USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 2/11 20: 9:54.00 Epicenter: -11.044 165.495 MW 5.7 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/11 20: 9:54.00 Centroid: -10.943 165.495 Depth 11 No. of sta: 22 Moment Tensor; Scale 10**17 Nm Mrr=-2.42 Mtt= 5.14 Mpp=-2.72 Mrt=-1.96 Mrp=-1.99 Mtp=-0.44 Principal axes: T Val= 5.62 Plg=13 Azm=179 N = -0.77 42 76 P = -4.85 44 283 Best Double Couple:Mo=5.3*10**17 NP1:Strike=310 Dip=48 Slip= -26 NP2: 58 71 -135
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.
