USGS WPhase Moment Solution

OFFSHORE O'HIGGINS, CHILE

12/11/21 21:36:22.00

Epicenter: -34.002  -71.956
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/21 21:36:22.00
Centroid:  -34.302  -71.956
Depth  25         No. of sta: 26
Moment Tensor;   Scale 10**17 Nm
  Mrr= 4.72       Mtt=-0.09
  Mpp=-4.63       Mrt= 1.39
  Mrp=-7.01       Mtp= 0.41
 Principal axes:
  T  Val=  8.59  Plg=61  Azm= 75
  N     = -0.09       2      170
  P     = -8.50      28      262

Best Double Couple:Mo=8.5*10**17
 NP1:Strike=360 Dip=17 Slip=  99
 NP2:       170     73        87

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.