USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/11 09:40:23.45 Epicenter: -11.055 166.778 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 5 No. of sta: 47 Moment Tensor; Scale 10**17 Nm Mrr=-3.96 Mtt= 2.24 Mpp= 1.72 Mrt= 0.50 Mrp= 0.21 Mtp=-1.09 Principal axes: T Val= 3.11 Plg= 2 Azm= 38 N 0.91 6 308 P -4.02 84 149 Best Double Couple:Mo=3.6*10**17 NP1:Strike=134 Dip=43 Slip= -82 NP2: 303 47 -98
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.
