USGS WPhase Moment Solution

SOLOMON ISLANDS

12/ 7/25 11:20:27.00

Epicenter:  -9.721  159.730
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 7/25 11:20:27.00
Centroid:   -9.521  159.730
Depth  30         No. of sta: 37
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.05       Mtt= 0.23
  Mpp=-0.18       Mrt= 4.42
  Mrp=-0.33       Mtp= 1.68
 Principal axes:
  T  Val=  4.72  Plg=41  Azm=344
  N     =  0.05      20       93
  P     = -4.78      41      203

Best Double Couple:Mo=4.8*10**18
 NP1:Strike=  4 Dip=21 Slip=-179
 NP2:       274     90       -69

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.