USGS Body-Wave Moment Tensor Solution


12/04/12 07:15:53.60

Epicenter:  28.884 -113.117
MW 6.9

Depth  20         No. of sta: 36
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.26       Mtt=-1.72
  Mpp= 1.98       Mrt= 0.50
  Mrp= 0.51       Mtp= 1.39
 Principal axes:
  T  Val=  2.59  Plg=13  Azm=289
  N       -0.35      74       72
  P       -2.24       9      197

Best Double Couple:Mo=2.4*10**19
 NP1:Strike=333 Dip=74 Slip= 177
 NP2:        64     88        16

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