USGS WPhase Moment Solution

SOUTH OF MARIANA ISLANDS

12/ 9/11 16:36:50.00

Epicenter:  11.793  143.222
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/11 16:36:50.00
Centroid:   11.593  143.427
Depth  15         No. of sta: 33
Moment Tensor;   Scale 10**17 Nm
  Mrr= 8.15       Mtt=-7.06
  Mpp=-1.09       Mrt= 2.57
  Mrp=-1.59       Mtp=-0.24
 Principal axes:
  T  Val=  8.83  Plg=76  Azm= 44
  N     = -1.35       9      271
  P     = -7.48       9      180

Best Double Couple:Mo=8.2*10**17
 NP1:Strike=259 Dip=36 Slip=  75
 NP2:        98     55       101

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.