USGS WPhase Moment Solution

KURIL ISLANDS

13/03/01 12:53:52

Epicenter:  50.938  157.511
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
13/03/01 12:53:52.00
Centroid:   50.838  157.670
Depth  40         No. of sta:144
Moment Tensor;   Scale 10**18 Nm
  Mrr= 3.48       Mtt=-0.90
  Mpp=-2.58       Mrt= 1.52
  Mrp= 2.52       Mtp=-1.44
 Principal axes:
  T  Val=  4.57  Plg=69  Azm=302
  N     = -0.07       0      210
  P     = -4.49      20      120

Best Double Couple:Mo=4.5*10**18
 NP1:Strike=209 Dip=25 Slip=  88
 NP2:        31     65        91

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.