USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/01 22:16:35.86 Epicenter: -10.938 165.445 MW 6.3 USGS MOMENT TENSOR SOLUTION Depth 21 No. of sta: 71 Moment Tensor; Scale 10**18 Nm Mrr= 0.99 Mtt= 0.81 Mpp=-1.80 Mrt= 1.30 Mrp=-2.34 Mtp= 0.76 Principal axes: T Val= 2.68 Plg=56 Azm= 40 N 0.85 14 152 P -3.53 30 250 Best Double Couple:Mo=3.2*10**18 NP1:Strike= 17 Dip=20 Slip= 137 NP2: 148 77 76
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.
