USGS WPhase Moment Solution

OFFSHORE MAULE, CHILE

12/12/27  0:37:10

Epicenter: -35.765  -73.274
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/27 00:37:10.00
Centroid:  -35.865  -73.520
Depth  13         No. of sta: 14
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.70       Mtt=-0.51
  Mpp=-3.20       Mrt=-1.65
  Mrp=-7.71       Mtp=-0.60
 Principal axes:
  T  Val=  8.82  Plg=57  Azm=102
  N     = -0.38       0       12
  P     = -8.44      32      282

Best Double Couple:Mo=8.6*10**17
 NP1:Strike= 12 Dip=12 Slip=  90
 NP2:       192     78        90

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.