USGS Body-Wave Moment Tensor Solution

SANTA CRUZ ISLANDS

13/02/09 21:02:22.52

Epicenter: -10.965  165.792
MW 6.5

USGS MOMENT TENSOR SOLUTION
Depth  18         No. of sta: 89
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.75       Mtt= 3.23
  Mpp=-2.48       Mrt= 0.57
  Mrp= 0.96       Mtp=-6.81
 Principal axes:
  T  Val=  7.76  Plg= 0  Azm=214
  N       -0.56      80      306
  P       -7.20      10      124

Best Double Couple:Mo=7.5*10**18
 NP1:Strike=168 Dip=83 Slip=  -7
 NP2:       259     83      -173

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