USGS WPhase Moment Solution

OFF COAST OF AISEN, CHILE

12/11/13  4:31:27

Epicenter: -45.743  -77.141
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/13 04:31:27.00
Centroid:  -45.643  -77.571
Depth  11         No. of sta:  8
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.11       Mtt= 0.40
  Mpp=-0.51       Mrt= 0.63
  Mrp=-0.41       Mtp=-1.63
 Principal axes:
  T  Val=  1.94  Plg=22  Azm= 36
  N     = -0.19      67      221
  P     = -1.75       1      127

Best Double Couple:Mo=1.9*10**18
 NP1:Strike=174 Dip=73 Slip=  15
 NP2:        80     76       163

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.