USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/01/31 03:33:43.86 Epicenter: -10.628 166.382 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 7 No. of sta: 51 Moment Tensor; Scale 10**18 Nm Mrr=-1.04 Mtt= 0.51 Mpp= 0.53 Mrt=-0.05 Mrp= 0.21 Mtp=-0.54 Principal axes: T Val= 1.07 Plg= 5 Azm=226 N -0.01 6 317 P -1.07 82 95 Best Double Couple:Mo=1.1*10**18 NP1:Strike=141 Dip=50 Slip= -83 NP2: 310 40 -99
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.