USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS REGION
13/02/06 10:33:17.65 Epicenter: -10.635 164.846 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 20 No. of sta: 8 Moment Tensor; Scale 10**18 Nm Mrr= 0.31 Mtt= 0.89 Mpp=-1.20 Mrt= 0.01 Mrp=-0.62 Mtp=-0.02 Principal axes: T Val= 0.89 Plg= 3 Azm= 1 N 0.53 70 99 P -1.42 20 270 Best Double Couple:Mo=1.2*10**18 NP1:Strike= 48 Dip=74 Slip=-168 NP2: 314 78 -16
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.