USGS Body-Wave Moment Tensor Solution


13/02/02 14:17:34.84

Epicenter:  42.828  143.093
MW 6.9

Depth 107         No. of sta:122
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.02       Mtt= 0.11
  Mpp=-0.13       Mrt= 2.75
  Mrp=-0.13       Mtp=-0.03
 Principal axes:
  T  Val=  2.82  Plg=45  Azm=  3
  N       -0.13       0      273
  P       -2.68      45      182

Best Double Couple:Mo=2.8*10**19
 NP1:Strike=136 Dip= 1 Slip= -47
 NP2:       273     90       -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