USGS WPhase Moment Solution


12/08/14  2:59:42

Epicenter:  49.795  145.112
MW 7.7

12/08/14 02:59:42.00
Centroid:   50.195  145.577
Depth 600         No. of sta: 66
Moment Tensor;   Scale 10**20 Nm
  Mrr= 3.46       Mtt=-1.55
  Mpp=-1.91       Mrt=-2.67
  Mrp=-0.59       Mtp=-2.26
 Principal axes:
  T  Val=  4.63  Plg=65  Azm=188
  N     =  0.02      18       53
  P     = -4.66      16      317

Best Double Couple:Mo=4.6*10**20
 NP1:Strike= 23 Dip=33 Slip=  55
 NP2:       243     64       110

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.