USGS WPhase Moment Solution

PACIFIC-ANTARCTIC RIDGE

13/ 1/15 16: 9:37.00

Epicenter: -62.557 -161.380
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 1/15 16: 9:37.00
Centroid:  -62.757 -161.380
Depth  13         No. of sta: 34
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.05       Mtt= 1.27
  Mpp=-1.31       Mrt= 0.10
  Mrp=-0.32       Mtp= 0.77
 Principal axes:
  T  Val=  1.48  Plg= 0  Azm=344
  N     =  0.11      78       77
  P     = -1.60      11      254

Best Double Couple:Mo=1.5*10**18
 NP1:Strike= 30 Dip=81 Slip=-172
 NP2:       299     82        -8

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.