USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/20 00:09:19.39 Epicenter: -10.785 166.860 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 4 No. of sta: 49 Moment Tensor; Scale 10**17 Nm Mrr=-2.77 Mtt= 0.99 Mpp= 1.78 Mrt=-0.60 Mrp= 0.32 Mtp=-1.26 Principal axes: T Val= 2.77 Plg= 6 Azm=233 N 0.09 6 142 P -2.86 82 11 Best Double Couple:Mo=2.8*10**17 NP1:Strike=138 Dip=52 Slip= -97 NP2: 329 39 -81
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.