USGS/SLU Regional Moment Solution


 12/10/03 19:51:09   
 Epicenter:  39.720 -119.440
 MW 3.4

 Depth  11         No. of sta: 13
 Moment Tensor;   Scale 10**14 Nm
   Mrr=-0.63       Mtt= 0.42
   Mpp= 0.21       Mrt= 0.30
   Mrp=-0.80       Mtp= 1.21
  Principal axes:
   T  Val=  1.58  Plg= 9  Azm=134
   N        0.00      48       34
   P       -1.58      41      233

 Best Double Couple:Mo=1.6*10**14
  NP1:Strike= 10 Dip=70 Slip=-142
  NP2:       265     55       -25

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