USGS WPhase Moment Solution
SANTA CRUZ ISLANDS REGION
13/ 2/ 6 1:23:19.00 Epicenter: -11.232 164.921 MW 7.1 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 6 1:23:19.00 Centroid: -11.632 164.309 Depth 11 No. of sta: 2 Moment Tensor; Scale 10**19 Nm Mrr=-4.96 Mtt= 1.32 Mpp= 3.64 Mrt= 0.02 Mrp= 1.99 Mtp=-2.95 Principal axes: T Val= 5.90 Plg= 8 Azm=237 N = -0.43 12 329 P = -5.46 74 113 Best Double Couple:Mo=5.7*10**19 NP1:Strike=312 Dip=38 Slip=-111 NP2: 158 55 -74
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.
