USGS Body-Wave Moment Tensor Solution
SANTIAGO DEL ESTERO, ARGENTINA
12/05/28 05:07:23.02 Epicenter: -28.061 -63.016 MW 6.7 USGS MOMENT TENSOR SOLUTION Depth 588 No. of sta: 65 Moment Tensor; Scale 10**19 Nm Mrr=-0.90 Mtt=-0.09 Mpp= 0.99 Mrt=-0.61 Mrp= 1.23 Mtp= 0.02 Principal axes: T Val= 1.63 Plg=27 Azm=260 N 0.06 13 163 P -1.70 59 50 Best Double Couple:Mo=1.7*10**19 NP1:Strike=159 Dip=74 Slip=-104 NP2: 20 21 -51
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.