USGS/SLU Regional Moment Solution


12/12/03 21:40:18.74

Epicenter:  39.625   23.335
MW 4.1

Depth   7         No. of sta: 18
Moment Tensor;   Scale 10**15 Nm
  Mrr= 0.04       Mtt= 1.46
  Mpp=-1.50       Mrt=-0.84
  Mrp=-0.20       Mtp=-0.52
 Principal axes:
  T  Val=  1.90  Plg=24  Azm=187
  N       -0.23      63       39
  P       -1.67      13      283

Best Double Couple:Mo=1.8*10**15
 NP1:Strike=234 Dip=83 Slip= 154
 NP2:       327     64         8

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