USGS WPhase Moment Solution

VALPARAISO, CHILE

12/ 4/17  3:50:16.00

Epicenter: -32.701  -71.484
MW 6.7

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 4/17  3:50:16.00
Centroid:  -32.801  -71.246
Depth  40         No. of sta: 27
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.01       Mtt= 0.04
  Mpp=-1.05       Mrt= 0.09
  Mrp=-1.18       Mtp= 0.11
 Principal axes:
  T  Val=  1.54  Plg=65  Azm= 87
  N     =  0.05       0      355
  P     = -1.59      24      264

Best Double Couple:Mo=1.6*10**19
 NP1:Strike=353 Dip=21 Slip=  87
 NP2:       175     69        91

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.