USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS REGION
13/02/07 00:30:11.35 Epicenter: -11.673 164.961 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 11 No. of sta: 28 Moment Tensor; Scale 10**18 Nm Mrr=-0.69 Mtt=-0.01 Mpp= 0.70 Mrt= 0.13 Mrp= 0.95 Mtp=-0.13 Principal axes: T Val= 1.19 Plg=27 Azm=267 N 0.02 9 2 P -1.20 62 108 Best Double Couple:Mo=1.2*10**18 NP1:Strike=184 Dip=72 Slip= -81 NP2: 337 20 -116
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.