USGS WPhase Moment Solution


12/11/10 14:57:49.00

Epicenter:  -8.912  -75.045
MW 6.0

12/11/10 14:57:49.00
Centroid:   -8.712  -74.641
Depth 120         No. of sta: 49
Moment Tensor;   Scale 10**18 Nm
  Mrr=-1.15       Mtt= 0.33
  Mpp= 0.82       Mrt= 0.02
  Mrp= 0.14       Mtp= 0.48
 Principal axes:
  T  Val=  1.12  Plg= 3  Azm=301
  N     =  0.03       2      211
  P     = -1.16      85       79

Best Double Couple:Mo=1.1*10**18
 NP1:Strike= 34 Dip=42 Slip= -85
 NP2:       209     48       -93

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.