USGS WPhase Moment Solution
SANTIAGO DEL ESTERO, ARGENTINA
11/09/02 13:47:11 Epicenter: -28.422 -63.146 MW 6.7 USGS/WPHASE CENTROID MOMENT TENSOR 11/09/02 13:47:11.00 Centroid: -28.522 -63.032 Depth 600 No. of sta: 53 Moment Tensor; Scale 10**18 Nm Mrr=-8.79 Mtt= 6.23 Mpp= 2.57 Mrt=-1.74 Mrp= 9.41 Mtp= 3.75 Principal axes: T Val= 9.76 Plg=18 Azm=310 N = 4.89 25 211 P =-14.65 58 72 Best Double Couple:Mo=1.3*10**19 NP1:Strike= 74 Dip=35 Slip= -42 NP2: 200 67 -117
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.
