USGS WPhase Moment Solution
OFFSHORE GUATEMALA
12/11/ 7 16:35:50.00 Epicenter: 14.082 -91.916 MW 7.4 USGS/WPHASE CENTROID MOMENT TENSOR 12/11/ 7 16:35:50.00 Centroid: 14.182 -91.916 Depth 30 No. of sta: 68 Moment Tensor; Scale 10**19 Nm Mrr= 9.96 Mtt=-8.23 Mpp=-1.73 Mrt= 8.17 Mrp=-6.97 Mtp= 3.94 Principal axes: T Val= 14.81 Plg=65 Azm= 50 N = -0.25 7 303 P =-14.56 23 209 Best Double Couple:Mo=1.5*10**20 NP1:Strike=285 Dip=23 Slip= 70 NP2: 126 69 98
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.
