USGS/SLU Regional Moment Solution

12/10/03 19:51:08.25

Epicenter:  39.723 -119.453
MW 3.4

USGS/SLU REGIONAL MOMENT TENSOR
Depth  10         No. of sta: 15
Moment Tensor;   Scale 10**14 Nm
  Mrr=-1.18       Mtt= 0.56
  Mpp= 0.61       Mrt= 0.28
  Mrp=-0.52       Mtp= 1.30
 Principal axes:
  T  Val=  1.90  Plg= 3  Azm=134
  N       -0.35      33       41
  P       -1.56      56      229

Best Double Couple:Mo=1.8*10**14
 NP1:Strike= 16 Dip=57 Slip=-131
 NP2:       254     51       -45

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