USGS WPhase Moment Solution
SANTIAGO DEL ESTERO, ARGENTINA
12/ 5/28 5: 7:23.00 Epicenter: -28.061 -63.077 MW 6.7 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 5/28 5: 7:23.00 Centroid: -28.261 -62.850 Depth 580 No. of sta: 19 Moment Tensor; Scale 10**19 Nm Mrr=-0.71 Mtt=-0.10 Mpp= 0.81 Mrt=-0.48 Mrp= 1.01 Mtp= 0.11 Principal axes: T Val= 1.32 Plg=27 Azm=264 N = 0.07 15 166 P = -1.39 57 49 Best Double Couple:Mo=1.4*10**19 NP1:Strike= 29 Dip=23 Slip= -44 NP2: 161 74 -106
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.
