USGS Body-Wave Moment Tensor Solution

SANTA CRUZ ISLANDS

13/02/09 05:32:08.28

Epicenter: -10.919  166.000
MW 5.5

USGS MOMENT TENSOR SOLUTION
Depth   9         No. of sta: 35
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.87       Mtt= 2.28
  Mpp=-1.41       Mrt=-0.62
  Mrp=-0.48       Mtp=-0.51
 Principal axes:
  T  Val=  2.44  Plg=10  Azm=186
  N       -0.61      56       82
  P       -1.83      32      282

Best Double Couple:Mo=2.2*10**17
 NP1:Strike=319 Dip=60 Slip= -17
 NP2:        58     75      -149

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