USGS/SLU Regional Moment Solution

SOUTHERN IDAHO

13/05/06 03:13:43.06

Epicenter:  42.613 -111.944
MW 3.9

USGS/SLU REGIONAL MOMENT TENSOR
Depth  13         No. of sta: 85
Moment Tensor;   Scale 10**14 Nm
  Mrr=-5.08       Mtt= 0.97
  Mpp= 4.11       Mrt= 4.71
  Mrp=-6.82       Mtp=-0.54
 Principal axes:
  T  Val=  8.78  Plg=31  Azm= 65
  N        1.35       7      331
  P       -10.13      58      229

Best Double Couple:Mo=9.5*10**14
 NP1:Strike=329 Dip=76 Slip= -97
 NP2:       177     16       -63

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