USGS WPhase Moment Solution
OFFSHORE EL SALVADOR
12/08/27 4:37:23 Epicenter: 12.279 -88.530 MW 7.3 USGS/WPHASE CENTROID MOMENT TENSOR 12/08/27 04:37:23.00 Centroid: 12.079 -88.530 Depth 11 No. of sta: 77 Moment Tensor; Scale 10**19 Nm Mrr= 5.14 Mtt=-4.54 Mpp=-0.60 Mrt= 9.36 Mrp=-5.76 Mtp= 1.55 Principal axes: T Val= 12.25 Plg=57 Azm= 36 N = -0.26 4 299 P =-11.99 32 206 Best Double Couple:Mo=1.2*10**20 NP1:Strike=279 Dip=13 Slip= 69 NP2: 120 78 95
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.
