USGS Body-Wave Moment Tensor Solution

NORTH ISLAND OF NEW ZEALAND

12/12/07 18:19:06.59

Epicenter: -38.298  176.090
MW 6.4

USGS MOMENT TENSOR SOLUTION
Depth 168         No. of sta: 42
Moment Tensor;   Scale 10**18 Nm
  Mrr= 1.51       Mtt=-0.19
  Mpp=-1.33       Mrt= 3.54
  Mrp= 0.36       Mtp=-1.87
 Principal axes:
  T  Val=  4.44  Plg=49  Azm= 14
  N       -0.39      27      248
  P       -4.06      28      142

Best Double Couple:Mo=4.3*10**18
 NP1:Strike=185 Dip=30 Slip=  23
 NP2:        74     79       118

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