USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/06 11:53:54.47 Epicenter: -11.269 165.756 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 52 Moment Tensor; Scale 10**18 Nm Mrr=-0.36 Mtt= 0.02 Mpp= 0.34 Mrt=-1.37 Mrp= 0.26 Mtp=-0.18 Principal axes: T Val= 1.31 Plg=39 Azm=203 N 0.24 10 105 P -1.56 49 4 Best Double Couple:Mo=1.5*10**18 NP1:Strike=104 Dip=85 Slip=-100 NP2: 347 11 -28
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.