USGS Body-Wave Moment Tensor Solution

SANTA CRUZ ISLANDS

13/02/08 23:16:30.56

Epicenter: -11.028  166.722
MW 5.4

USGS MOMENT TENSOR SOLUTION
Depth   9         No. of sta: 27
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.62       Mtt= 0.50
  Mpp= 1.12       Mrt= 0.14
  Mrp= 0.73       Mtp=-0.90
 Principal axes:
  T  Val=  1.84  Plg= 9  Azm=237
  N        0.01      17      329
  P       -1.86      71      120

Best Double Couple:Mo=1.9*10**17
 NP1:Strike=161 Dip=56 Slip= -70
 NP2:       308     39      -117

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