USGS Centroid Moment Solution

SANTA CRUZ ISLANDS

12/01/09 04:07:16.59

Epicenter: -10.577  165.178
MW 6.4

USGS CENTROID MOMENT TENSOR
12/01/09 04:07:35.20
Centroid:  -9.937  165.034
Depth  41         No. of sta: 28
Moment Tensor;   Scale 10**18 Nm
  Mrr= 1.77       Mtt=-3.59
  Mpp= 1.82       Mrt= 0.63
  Mrp=-3.16       Mtp=-1.51
 Principal axes:
  T  Val=  5.21  Plg=43  Azm= 76
  N       -1.22      47      251
  P       -3.99       3      344

Best Double Couple:Mo=4.6*10**18
 NP1:Strike=111 Dip=59 Slip= 148
 NP2:       219     63        35

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