USGS WPhase Moment Solution
PACIFIC-ANTARCTIC RIDGE
13/01/09 21:46: 3 Epicenter: -57.058 -141.451 MW 5.6 USGS/WPHASE CENTROID MOMENT TENSOR 13/01/09 21:46: 3.00 Centroid: -57.458 -141.818 Depth 11 No. of sta: 10 Moment Tensor; Scale 10**17 Nm Mrr=-0.53 Mtt= 2.46 Mpp=-1.92 Mrt=-0.37 Mrp= 1.06 Mtp= 1.26 Principal axes: T Val= 2.80 Plg= 1 Azm=165 N = 0.01 63 258 P = -2.81 26 74 Best Double Couple:Mo=2.8*10**17 NP1:Strike=210 Dip=43 Slip=-178 NP2: 118 89 -46
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.
