USGS Body-Wave Moment Tensor Solution

TONGA

12/04/28 10:08:07.68

Epicenter: -18.657 -174.704
MW 6.7

USGS MOMENT TENSOR SOLUTION
Depth 132         No. of sta: 95
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.88       Mtt= 0.90
  Mpp=-0.02       Mrt= 0.85
  Mrp= 0.50       Mtp= 0.19
 Principal axes:
  T  Val=  1.34  Plg=23  Azm=343
  N       -0.00      10      248
  P       -1.34      64      137

Best Double Couple:Mo=1.3*10**19
 NP1:Strike=245 Dip=69 Slip=-101
 NP2:        93     23       -64

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