USGS WPhase Moment Solution
SOUTH OF MARIANA ISLANDS
12/ 9/11 16:36:50.00 Epicenter: 11.793 143.222 MW 5.9 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 9/11 16:36:50.00 Centroid: 11.593 143.427 Depth 15 No. of sta: 33 Moment Tensor; Scale 10**17 Nm Mrr= 8.15 Mtt=-7.06 Mpp=-1.09 Mrt= 2.57 Mrp=-1.59 Mtp=-0.24 Principal axes: T Val= 8.83 Plg=76 Azm= 44 N = -1.35 9 271 P = -7.48 9 180 Best Double Couple:Mo=8.2*10**17 NP1:Strike=259 Dip=36 Slip= 75 NP2: 98 55 101
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.
