USGS/SLU Regional Moment Solution

SOUTHERN IDAHO

13/03/01 07:50:23.07

Epicenter:  42.562 -111.089
MW 3.9

USGS/SLU REGIONAL MOMENT TENSOR
Depth  10         No. of sta: 49
Moment Tensor;   Scale 10**14 Nm
  Mrr=-5.06       Mtt=-0.72
  Mpp= 5.77       Mrt=-0.25
  Mrp=-5.30       Mtp=-0.84
 Principal axes:
  T  Val=  7.99  Plg=22  Azm= 85
  N       -0.72       6      178
  P       -7.27      67      282

Best Double Couple:Mo=7.7*10**14
 NP1:Strike=  0 Dip=67 Slip= -83
 NP2:       163     24      -106

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