USGS WPhase Moment Solution
EL SALVADOR
12/ 6/27 6:31:3.00 Epicenter: 13.921 -89.970 MW 5.7 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 6/27 6:31: 3.00 Centroid: 13.721 -89.763 Depth 110 No. of sta: 26 Moment Tensor; Scale 10**17 Nm Mrr= 0.06 Mtt=-0.04 Mpp=-0.02 Mrt= 3.08 Mrp=-1.92 Mtp=-1.55 Principal axes: T Val= 4.44 Plg=39 Azm= 38 N = -1.34 15 295 P = -3.10 46 189 Best Double Couple:Mo=3.9*10**17 NP1:Strike=191 Dip=15 Slip= -14 NP2: 295 86 -105
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.
