USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 2/ 6 0: 7:22.00 Epicenter: -10.857 165.206 MW 6.0 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 6 0: 7:22.00 Centroid: -11.157 165.206 Depth 13 No. of sta: 25 Moment Tensor; Scale 10**18 Nm Mrr= 0.49 Mtt= 0.64 Mpp=-1.13 Mrt= 0.44 Mrp= 0.15 Mtp= 0.58 Principal axes: T Val= 1.14 Plg=35 Azm=343 N = 0.16 54 164 P = -1.30 0 73 Best Double Couple:Mo=1.2*10**18 NP1:Strike=124 Dip=65 Slip= 26 NP2: 23 66 153
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.
