USGS Centroid Moment Solution

TONGA

12/04/28 10:08:07.68

Epicenter: -18.657 -174.704
MW 6.7

USGS CENTROID MOMENT TENSOR
12/04/28 10:08:24.59
Centroid: -18.574 -174.878
Depth 125         No. of sta: 148
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.86       Mtt= 0.79
  Mpp= 0.07       Mrt= 0.84
  Mrp= 0.38       Mtp= 0.24
 Principal axes:
  T  Val=  1.26  Plg=23  Azm=341
  N        0.00       4      249
  P       -1.26      66      151

Best Double Couple:Mo=1.3*10**19
 NP1:Strike= 78 Dip=22 Slip= -80
 NP2:       248     69       -94

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