USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/02/10 18:39:35 Epicenter: -10.978 165.444 MW 6.0 USGS/WPHASE CENTROID MOMENT TENSOR 13/02/10 18:39:35.00 Centroid: -10.778 165.444 Depth 13 No. of sta: 31 Moment Tensor; Scale 10**18 Nm Mrr=-0.69 Mtt= 1.00 Mpp=-0.32 Mrt=-0.43 Mrp=-0.38 Mtp=-0.32 Principal axes: T Val= 1.14 Plg=11 Azm=189 N = -0.08 33 91 P = -1.06 54 295 Best Double Couple:Mo=1.1*10**18 NP1:Strike=314 Dip=45 Slip= -38 NP2: 73 64 -127
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.