USGS Body-Wave Moment Tensor Solution


12/12/06 21:33:26.30

Epicenter: -54.216   -1.983
MW 5.3

Depth   4         No. of sta: 18
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.25       Mtt= 0.47
  Mpp=-0.72       Mrt= 0.58
  Mrp=-0.19       Mtp=-0.65
 Principal axes:
  T  Val=  1.16  Plg=34  Azm= 23
  N       -0.15      56      209
  P       -1.01       3      115

Best Double Couple:Mo=1.1*10**17
 NP1:Strike=164 Dip=65 Slip=  23
 NP2:        64     69       153

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