USGS Centroid Moment Solution


13/02/02 14:17:34.85

Epicenter:  42.823  143.092
MW 6.9

13/02/02 14:17:50.20
Centroid:  42.927  143.321
Depth  91         No. of sta: 95
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.39       Mtt= 0.67
  Mpp=-0.28       Mrt= 3.14
  Mrp=-0.11       Mtp= 0.31
 Principal axes:
  T  Val=  3.33  Plg=40  Azm=357
  N       -0.25       6       92
  P       -3.07      49      189

Best Double Couple:Mo=3.2*10**19
 NP1:Strike= 40 Dip= 8 Slip=-142
 NP2:       272     85       -84

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