USGS WPhase Moment Solution

ANTOFAGASTA, CHILE

12/10/ 8  1:50:25.00

Epicenter: -21.768  -68.261
MW 5.7

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/ 8  1:50:25.00
Centroid:  -21.868  -68.261
Depth 120         No. of sta: 27
Moment Tensor;   Scale 10**17 Nm
  Mrr=-4.09       Mtt= 0.40
  Mpp= 3.69       Mrt= 0.04
  Mrp=-2.91       Mtp=-0.29
 Principal axes:
  T  Val=  4.68  Plg=18  Azm= 85
  N     =  0.38       1      176
  P     = -5.06      71      271

Best Double Couple:Mo=4.9*10**17
 NP1:Strike=173 Dip=27 Slip= -94
 NP2:       357     63       -88

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.