USGS WPhase Moment Solution

EAST OF SEVERNAYA ZEMLYA

12/12/13 23:03:38

Epicenter:  80.784  121.561
MW 5.5

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/13 23:03:38.00
Centroid:   80.784  121.561
Depth  11         No. of sta: 25
Moment Tensor;   Scale 10**17 Nm
  Mrr=-2.21       Mtt= 0.21
  Mpp= 2.00       Mrt= 0.70
  Mrp= 0.87       Mtp=-1.06
 Principal axes:
  T  Val=  2.54  Plg= 6  Azm=247
  N     =  0.13      22      340
  P     = -2.67      66      142

Best Double Couple:Mo=2.6*10**17
 NP1:Strike=314 Dip=43 Slip=-123
 NP2:       177     55       -62

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.