USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/01/30 23:03:45.74 Epicenter: -10.603 166.391 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 11 No. of sta: 23 Moment Tensor; Scale 10**18 Nm Mrr=-0.19 Mtt= 0.26 Mpp=-0.07 Mrt= 0.18 Mrp= 0.23 Mtp=-1.05 Principal axes: T Val= 1.16 Plg= 1 Azm=221 N -0.09 72 313 P -1.07 18 130 Best Double Couple:Mo=1.1*10**18 NP1:Strike=174 Dip=78 Slip= -14 NP2: 267 77 -167
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.