USGS Body-Wave Moment Tensor Solution

SANTA CRUZ ISLANDS

12/01/09 04:07:16.59

Epicenter: -10.577  165.178
MW 6.3

USGS MOMENT TENSOR SOLUTION
Depth  28         No. of sta: 41
Moment Tensor;   Scale 10**18 Nm
  Mrr= 1.91       Mtt=-3.28
  Mpp= 1.37       Mrt= 0.92
  Mrp=-1.83       Mtp=-0.46
 Principal axes:
  T  Val=  3.63  Plg=49  Azm= 77
  N       -0.19      40      276
  P       -3.44       9      178

Best Double Couple:Mo=3.5*10**18
 NP1:Strike=231 Dip=50 Slip=  34
 NP2:       118     65       135

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