USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/06 10:20:34.27 Epicenter: -10.860 165.270 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 48 Moment Tensor; Scale 10**17 Nm Mrr=-2.32 Mtt=-2.33 Mpp= 4.65 Mrt= 2.87 Mrp=-4.46 Mtp= 3.90 Principal axes: T Val= 7.43 Plg=20 Azm=106 N 0.53 43 357 P -7.96 41 214 Best Double Couple:Mo=7.7*10**17 NP1:Strike=242 Dip=46 Slip= -18 NP2: 345 77 -134
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.