USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/06 13:54:53.66 Epicenter: -10.788 166.504 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 7 No. of sta: 26 Moment Tensor; Scale 10**17 Nm Mrr=-5.61 Mtt= 0.01 Mpp= 5.60 Mrt=-1.60 Mrp= 0.13 Mtp=-0.78 Principal axes: T Val= 5.72 Plg= 2 Azm=262 N 0.31 15 171 P -6.03 75 359 Best Double Couple:Mo=5.9*10**17 NP1:Strike= 6 Dip=45 Slip= -69 NP2: 158 49 -110
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.