USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/17 19:18:52.46 Epicenter: -10.804 165.745 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 39 Moment Tensor; Scale 10**17 Nm Mrr=-0.70 Mtt= 2.22 Mpp=-1.52 Mrt=-0.24 Mrp=-0.64 Mtp=-0.45 Principal axes: T Val= 2.29 Plg= 3 Azm=186 N -0.35 61 90 P -1.94 28 278 Best Double Couple:Mo=2.1*10**17 NP1:Strike= 56 Dip=73 Slip=-157 NP2: 318 68 -19
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.
