USGS WPhase Moment Solution

SOLOMON ISLANDS

12/ 9/27 23:53:49.00

Epicenter:  -8.824  157.557
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/27 23:53:49.00
Centroid:   -8.824  157.456
Depth  11         No. of sta: 21
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.42       Mtt=-0.27
  Mpp=-3.15       Mrt= 3.64
  Mrp=-3.33       Mtp= 1.38
 Principal axes:
  T  Val=  6.19  Plg=60  Azm= 29
  N     = -0.21      12      141
  P     = -5.98      26      238

Best Double Couple:Mo=6.1*10**17
 NP1:Strike=356 Dip=21 Slip= 126
 NP2:       138     73        77

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.