USGS WPhase Moment Solution


11/07/06 19:03:16

Epicenter: -29.312 -176.204
MW 7.6

11/07/06 19:03:16.00
Centroid:  -29.312 -175.859
Depth  15         No. of sta: 50
Moment Tensor;   Scale 10**20 Nm
  Mrr=-2.31       Mtt=-0.62
  Mpp= 2.93       Mrt=-0.38
  Mrp= 0.59       Mtp= 0.07
 Principal axes:
  T  Val=  2.99  Plg= 6  Azm=270
  N     = -0.54      11      179
  P     = -2.45      76       27

Best Double Couple:Mo=2.8*10**20
 NP1:Strike= 14 Dip=40 Slip= -71
 NP2:       170     52      -105

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.