USGS WPhase Moment Solution

ATACAMA, CHILE

13/ 1/30 20:15:43.00

Epicenter: -28.168  -70.803
MW 6.8

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 1/30 20:15:43.00
Centroid:  -28.068  -70.803
Depth  50         No. of sta: 62
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.33       Mtt= 0.03
  Mpp=-1.36       Mrt= 0.26
  Mrp=-1.01       Mtp=-0.22
 Principal axes:
  T  Val=  1.73  Plg=68  Azm= 59
  N     = -0.02      11      180
  P     = -1.71      18      274

Best Double Couple:Mo=1.7*10**19
 NP1:Strike= 22 Dip=29 Slip= 114
 NP2:       175     64        77

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.