USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/02 18:58:06.70 Epicenter: -10.922 165.246 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 20 Moment Tensor; Scale 10**18 Nm Mrr= 0.56 Mtt= 0.45 Mpp=-1.01 Mrt= 0.77 Mrp=-0.82 Mtp= 0.09 Principal axes: T Val= 1.41 Plg=50 Azm= 22 N 0.04 28 151 P -1.45 26 256 Best Double Couple:Mo=1.4*10**18 NP1:Strike= 30 Dip=31 Slip= 153 NP2: 144 77 62
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.
