USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/10 18:39:35.76 Epicenter: -10.980 165.447 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 22 No. of sta: 32 Moment Tensor; Scale 10**17 Nm Mrr= 0.34 Mtt= 6.46 Mpp=-6.80 Mrt=-4.23 Mrp=-1.53 Mtp=-1.99 Principal axes: T Val= 8.70 Plg=26 Azm=185 N -0.96 58 42 P -7.74 17 283 Best Double Couple:Mo=8.3*10**17 NP1:Strike=326 Dip=59 Slip= 7 NP2: 232 84 149
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.