USGS Body-Wave Moment Tensor Solution


12/06/04 03:15:24.53

Epicenter:   5.507  -82.457
MW 6.1

Depth   6         No. of sta: 65
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.44       Mtt= 1.60
  Mpp=-1.17       Mrt= 0.30
  Mrp= 0.20       Mtp= 0.65
 Principal axes:
  T  Val=  1.80  Plg= 9  Azm=347
  N       -0.47      78      212
  P       -1.33       9       78

Best Double Couple:Mo=1.6*10**18
 NP1:Strike= 33 Dip=90 Slip= 168
 NP2:       123     78         0

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