USGS WPhase Moment Solution
SANTA CRUZ ISLANDS REGION
13/ 2/ 7 8: 3:41.00 Epicenter: -11.024 164.749 MW 5.8 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 7 8: 3:41.00 Centroid: -10.924 164.749 Depth 13 No. of sta: 40 Moment Tensor; Scale 10**17 Nm Mrr=-5.99 Mtt= 0.67 Mpp= 5.32 Mrt=-2.04 Mrp=-0.81 Mtp= 1.70 Principal axes: T Val= 6.04 Plg= 6 Azm=110 N = 0.53 13 201 P = -6.58 74 353 Best Double Couple:Mo=6.3*10**17 NP1:Strike=185 Dip=40 Slip=-111 NP2: 32 53 -72
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.
