USGS WPhase Moment Solution

HAIDA GWAII, CANADA

12/10/28 18:54:21

Epicenter:  52.632 -132.701
MW 6.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/28 18:54:21.00
Centroid:   52.632 -132.701
Depth  11         No. of sta: 75
Moment Tensor;   Scale 10**18 Nm
  Mrr=-3.55       Mtt= 1.37
  Mpp= 2.18       Mrt=-0.76
  Mrp= 0.72       Mtp=-1.80
 Principal axes:
  T  Val=  3.77  Plg= 8  Azm=231
  N     = -0.07       2      140
  P     = -3.70      81       35

Best Double Couple:Mo=3.7*10**18
 NP1:Strike=324 Dip=37 Slip= -86
 NP2:       139     53       -92

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.