USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/06 00:07:22.66 Epicenter: -10.878 165.209 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 39 Moment Tensor; Scale 10**18 Nm Mrr= 1.01 Mtt= 1.17 Mpp=-2.18 Mrt= 0.15 Mrp=-0.83 Mtp=-0.18 Principal axes: T Val= 1.38 Plg=45 Azm= 16 N 1.00 41 170 P -2.39 14 272 Best Double Couple:Mo=2.1*10**18 NP1:Strike=152 Dip=70 Slip= 45 NP2: 43 48 15393
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.