USGS Body-Wave Moment Tensor Solution


11/12/11 01:47:25.81

Epicenter:  18.014  -99.801
MW 6.4

Depth  60         No. of sta: 65
Moment Tensor;   Scale 10**18 Nm
  Mrr=-4.44       Mtt= 3.60
  Mpp= 0.85       Mrt=-2.25
  Mrp= 0.41       Mtp=-1.74
 Principal axes:
  T  Val=  4.96  Plg=13  Azm=204
  N        0.07       6      113
  P       -5.03      75      358

Best Double Couple:Mo=5.0*10**18
 NP1:Strike=109 Dip=59 Slip= -97
 NP2:       303     32       -78

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