USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 2/ 1 22:16:37.00 Epicenter: -10.996 165.402 MW 6.3 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 1 22:16:37.00 Centroid: -10.996 165.199 Depth 23 No. of sta: 30 Moment Tensor; Scale 10**18 Nm Mrr= 2.72 Mtt=-0.68 Mpp=-2.04 Mrt= 0.91 Mrp=-1.44 Mtp= 0.99 Principal axes: T Val= 3.23 Plg=73 Azm= 54 N = -0.17 1 150 P = -3.06 16 241 Best Double Couple:Mo=3.1*10**18 NP1:Strike=334 Dip=29 Slip= 94 NP2: 150 61 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.
