USGS Centroid Moment Solution

TONGA REGION

12/11/17 05:12:56.99

Epicenter: -18.315 -172.325
MW 5.9

USGS CENTROID MOMENT TENSOR
12/11/17 05:13:20.00
Centroid: -17.733 -172.107
Depth  10         No. of sta: 37
Moment Tensor;   Scale 10**17 Nm
  Mrr=-7.71       Mtt=-0.56
  Mpp= 8.27       Mrt= 1.41
  Mrp= 0.70       Mtp= 2.61
 Principal axes:
  T  Val=  9.05  Plg= 4  Azm=286
  N       -1.07      10       16
  P       -7.98      79      176

Best Double Couple:Mo=8.5*10**17
 NP1:Strike=  5 Dip=42 Slip=-105
 NP2:       205     49       -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