USGS WPhase Moment Solution
VERACRUZ, MEXICO
11/04/07 13:11:24 Epicenter: 17.431 -93.978 MW 6.6 USGS/WPHASE CENTROID MOMENT TENSOR 11/04/07 13:11:24.00 Centroid: 17.431 -93.778 Depth 167 No. of sta:177 Moment Tensor; Scale 10**18 Nm Mrr=-4.67 Mtt=-0.40 Mpp= 5.06 Mrt= 8.21 Mrp=-4.09 Mtp=-4.62 Principal axes: T Val= 11.69 Plg=27 Azm= 50 N = -0.66 23 307 P =-11.03 52 182 Best Double Couple:Mo=1.1*10**19 NP1:Strike=183 Dip=27 Slip= -31 NP2: 301 76 -113
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 form 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.
