USGS Body-Wave Moment Tensor Solution


12/09/08 06:54:19.21

Epicenter:  21.517  145.921
MW 5.7

Depth   5         No. of sta: 65
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.26       Mtt= 0.27
  Mpp=-0.53       Mrt=-1.99
  Mrp= 3.71       Mtp=-0.18
 Principal axes:
  T  Val=  4.27  Plg=46  Azm=236
  N       -0.05       6      332
  P       -4.21      43       68

Best Double Couple:Mo=4.2*10**17
 NP1:Strike=332 Dip=88 Slip=  84
 NP2:       227      6       165

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