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

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.