USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/07 18:59:15.96 Epicenter: -10.984 165.707 MW 6.7 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 94 Moment Tensor; Scale 10**19 Nm Mrr= 0.02 Mtt= 0.13 Mpp=-0.15 Mrt=-0.01 Mrp= 0.29 Mtp=-1.31 Principal axes: T Val= 1.34 Plg= 9 Azm=223 N 0.02 77 358 P -1.36 9 131 Best Double Couple:Mo=1.4*10**19 NP1:Strike=357 Dip=90 Slip= 13 NP2: 267 77 180
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.