USGS/SLU Regional Moment Solution

12/11/10 17:08:12.93

Epicenter:  37.124  -82.954
MW 4.2

USGS/SLU REGIONAL MOMENT TENSOR
Depth  13         No. of sta: 50
Moment Tensor;   Scale 10**15 Nm
  Mrr=-0.75       Mtt= 1.76
  Mpp=-1.01       Mrt=-0.84
  Mrp= 0.54       Mtp= 1.30
 Principal axes:
  T  Val=  2.38  Plg=11  Azm=161
  N       -0.33      54      267
  P       -2.06      33       63

Best Double Couple:Mo=2.2*10**15
 NP1:Strike=108 Dip=75 Slip= -33
 NP2:       207     58      -163

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