USGS WPhase Moment Solution

SOUTH SHETLAND ISLANDS

12/ 1/15 13:40:17.00

Epicenter: -60.755  -55.473
MW 6.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 1/15 13:40:17.00
Centroid:  -60.555  -56.087
Depth  11         No. of sta: 26
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.06       Mtt= 0.97
  Mpp=-1.03       Mrt= 0.27
  Mrp=-0.40       Mtp=-0.03
 Principal axes:
  T  Val=  1.05  Plg=16  Azm=  4
  N     =  0.12      64      133
  P     = -1.17      18      268

Best Double Couple:Mo=1.1*10**19
 NP1:Strike= 47 Dip=65 Slip=-178
 NP2:       316     89       -25

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.