USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 2/ 1 5:36:41.00 Epicenter: -11.134 165.479 MW 6.0 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 1 5:36:41.00 Centroid: -11.234 165.479 Depth 15 No. of sta: 35 Moment Tensor; Scale 10**17 Nm Mrr= 6.03 Mtt=-2.08 Mpp=-3.95 Mrt= 4.73 Mrp=-8.21 Mtp= 2.17 Principal axes: T Val= 11.39 Plg=60 Azm= 61 N = -0.67 1 329 P =-10.72 29 238 Best Double Couple:Mo=1.1*10**18 NP1:Strike=325 Dip=16 Slip= 85 NP2: 149 74 91
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.
