USGS Body-Wave Moment Tensor Solution

TONGA

12/11/30 11:20:39.48

Epicenter: -18.869 -175.539
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth 228         No. of sta: 38
Moment Tensor;   Scale 10**17 Nm
  Mrr=-2.82       Mtt= 1.11
  Mpp= 1.71       Mrt=-1.60
  Mrp=-1.98       Mtp= 1.29
 Principal axes:
  T  Val=  3.73  Plg=21  Azm=129
  N        0.08       0      219
  P       -3.81      69      309

Best Double Couple:Mo=3.8*10**17
 NP1:Strike=218 Dip=24 Slip= -91
 NP2:        39     66       -90

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