USGS Body-Wave Moment Tensor Solution

TONGA REGION

12/11/17 05:12:56.98

Epicenter: -18.319 -172.324
MW 5.8

USGS MOMENT TENSOR SOLUTION
Depth   7         No. of sta: 86
Moment Tensor;   Scale 10**17 Nm
  Mrr=-4.96       Mtt= 0.39
  Mpp= 4.57       Mrt=-0.60
  Mrp= 4.80       Mtp= 0.88
 Principal axes:
  T  Val=  6.62  Plg=22  Azm=276
  N        0.44       8      182
  P       -7.06      66       73

Best Double Couple:Mo=6.8*10**17
 NP1:Strike=179 Dip=68 Slip= -99
 NP2:        22     24       -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