USGS Centroid Moment Solution
OFFSHORE EL SALVADOR
12/08/27 04:37:23.40 Epicenter: 12.282 -88.482 MW 7.4 USGS CENTROID MOMENT TENSOR 12/08/27 04:37:50.29 Centroid: 11.984 -88.800 Depth 19 No. of sta: 90 Moment Tensor; Scale 10**20 Nm Mrr= 0.69 Mtt=-0.52 Mpp=-0.17 Mrt= 1.47 Mrp=-0.80 Mtp= 0.17 Principal axes: T Val= 1.84 Plg=55 Azm= 30 N -0.10 2 298 P -1.74 35 207 Best Double Couple:Mo=1.8*10**20 NP1:Strike=118 Dip=80 Slip= 92 NP2: 289 11 81
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.
