USGS WPhase Moment Solution
SANTA CRUZ ISLANDS
13/ 1/30 23: 3:45.00 Epicenter: -10.518 166.486 MW 6.1 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 1/30 23: 3:45.00 Centroid: -10.418 166.282 Depth 11 No. of sta: 25 Moment Tensor; Scale 10**18 Nm Mrr=-0.16 Mtt= 0.13 Mpp= 0.03 Mrt= 0.01 Mrp= 0.42 Mtp=-1.50 Principal axes: T Val= 1.62 Plg= 9 Azm=225 N = -0.14 73 349 P = -1.49 13 132 Best Double Couple:Mo=1.6*10**18 NP1:Strike=269 Dip=74 Slip=-177 NP2: 179 87 -16
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.
