USGS Centroid Moment Solution
OFFSHORE GUATEMALA
12/11/11 22:15:00.60 Epicenter: 14.156 -92.188 MW 6.4 USGS CENTROID MOMENT TENSOR 12/11/11 22:15:25.29 Centroid: 14.198 -92.299 Depth 21 No. of sta: 76 Moment Tensor; Scale 10**18 Nm Mrr= 3.76 Mtt=-3.23 Mpp=-0.53 Mrt= 3.79 Mrp=-2.43 Mtp= 1.20 Principal axes: T Val= 5.92 Plg=64 Azm= 39 N -0.16 6 298 P -5.76 25 205 Best Double Couple:Mo=5.8*10**18 NP1:Strike=120 Dip=70 Slip= 96 NP2: 283 21 74
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.
