USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/08 04:26:16.50 Epicenter: -11.043 165.822 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 23 Moment Tensor; Scale 10**17 Nm Mrr= 0.09 Mtt= 0.99 Mpp=-1.08 Mrt=-0.43 Mrp=-0.12 Mtp=-2.35 Principal axes: T Val= 2.56 Plg= 7 Azm=213 N 0.09 80 79 P -2.65 7 304 Best Double Couple:Mo=2.6*10**17 NP1:Strike= 78 Dip=90 Slip=-170 NP2: 348 80 -0
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.