USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS REGION
13/02/07 08:03:41.07 Epicenter: -11.052 164.764 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 5 No. of sta: 14 Moment Tensor; Scale 10**17 Nm Mrr=-6.88 Mtt= 1.26 Mpp= 5.62 Mrt= 1.14 Mrp= 0.65 Mtp= 0.89 Principal axes: T Val= 5.86 Plg= 4 Azm=282 N 1.20 7 12 P -7.06 82 162 Best Double Couple:Mo=6.5*10**17 NP1:Strike=198 Dip=49 Slip= -81 NP2: 5 42 -100
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.