USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/01 05:36:40.93 Epicenter: -11.090 165.538 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 10 No. of sta: 55 Moment Tensor; Scale 10**17 Nm Mrr= 3.92 Mtt= 0.13 Mpp=-4.05 Mrt= 5.09 Mrp=-7.07 Mtp= 1.11 Principal axes: T Val= 9.71 Plg=56 Azm= 45 N -0.13 9 148 P -9.59 32 244 Best Double Couple:Mo=9.7*10**17 NP1:Strike= 4 Dip=15 Slip= 127 NP2: 147 78 81
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.
