USGS Body-Wave Moment Tensor Solution

MICHOACAN, MEXICO

12/04/11 22:55:13.64

Epicenter:  18.311 -102.699
MW 6.5

USGS MOMENT TENSOR SOLUTION
Depth  20         No. of sta: 65
Moment Tensor;   Scale 10**18 Nm
  Mrr= 2.28       Mtt=-2.30
  Mpp= 0.02       Mrt= 5.06
  Mrp=-2.01       Mtp= 0.85
 Principal axes:
  T  Val=  5.82  Plg=57  Azm= 24
  N        0.29       2      291
  P       -6.10      33      200

Best Double Couple:Mo=6.0*10**18
 NP1:Strike=284 Dip=12 Slip=  82
 NP2:       111     78        92

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