USGS WPhase Moment Solution
OFFSHORE GUATEMALA
12/11/11 22:15:1.00 Epicenter: 14.205 -92.124 MW 6.5 USGS/WPHASE CENTROID MOMENT TENSOR 12/11/11 22:15: 1.00 Centroid: 14.105 -92.228 Depth 15 No. of sta: 79 Moment Tensor; Scale 10**18 Nm Mrr= 3.36 Mtt=-2.53 Mpp=-0.83 Mrt= 6.04 Mrp=-2.56 Mtp= 1.07 Principal axes: T Val= 7.46 Plg=57 Azm= 21 N = -0.31 0 113 P = -7.15 31 204 Best Double Couple:Mo=7.3*10**18 NP1:Strike=298 Dip=13 Slip= 94 NP2: 113 77 89
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.
