USGS WPhase Moment Solution

BALLENY ISLANDS REGION

12/10/ 9 12:32:4.00

Epicenter: -61.033  153.959
MW 6.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/ 9 12:32: 4.00
Centroid:  -60.733  153.133
Depth  11         No. of sta: 17
Moment Tensor;   Scale 10**18 Nm
  Mrr=-1.26       Mtt= 8.19
  Mpp=-6.93       Mrt= 3.95
  Mrp= 3.21       Mtp=-6.64
 Principal axes:
  T  Val= 11.26  Plg=12  Azm= 17
  N     =  0.14      62      262
  P     =-11.40      24      113

Best Double Couple:Mo=1.1*10**19
 NP1:Strike=154 Dip=64 Slip=  -8
 NP2:       247     82      -153

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.