USGS/SLU Regional Moment Solution

EASTERN TEXAS

13/09/02 21:52:38.70

Epicenter:  31.927  -94.434
MW 4.2

USGS/SLU REGIONAL MOMENT TENSOR
Depth   4         No. of sta: 29
Moment Tensor;   Scale 10**15 Nm
  Mrr= 0.29       Mtt= 2.17
  Mpp=-2.46       Mrt=-0.06
  Mrp=-0.90       Mtp=-0.61
 Principal axes:
  T  Val=  2.25  Plg= 2  Azm=  8
  N        0.56      74      104
  P       -2.80      16      277

Best Double Couple:Mo=2.6*10**15
 NP1:Strike= 54 Dip=77 Slip=-170
 NP2:       321     80       -13

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