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

Moment Tensor Solution
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.

Moment Tensor Solution

Details on the W-phase inversion algorithm.