USGS Body-Wave Moment Tensor Solution

SANTA CRUZ ISLANDS

13/02/11 20:09:54.55

Epicenter: -11.018  165.583
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth  11         No. of sta: 43
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.28       Mtt= 3.08
  Mpp=-3.37       Mrt=-1.76
  Mrp=-1.31       Mtp=-0.66
 Principal axes:
  T  Val=  3.93  Plg=26  Azm=180
  N        0.06      56       45
  P       -3.99      21      281

Best Double Couple:Mo=4.0*10**17
 NP1:Strike=322 Dip=56 Slip=   4
 NP2:       230     87       146

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