USGS Centroid Moment Solution

SOUTHEASTERN ALASKA

13/01/05 08:58:18.75

Epicenter:  55.458 -134.543
MW 7.5

USGS CENTROID MOMENT TENSOR
13/01/05 08:58:43.20
Centroid:  55.682 -135.086
Depth  10         No. of sta:164
Moment Tensor;   Scale 10**20 Nm
  Mrr= 0.02       Mtt=-1.75
  Mpp= 1.73       Mrt= 1.07
  Mrp= 1.04       Mtp= 1.26
 Principal axes:
  T  Val=  2.79  Plg=26  Azm=292
  N       -0.40      57       71
  P       -2.40      19      192

Best Double Couple:Mo=2.6*10**20
 NP1:Strike= 63 Dip=85 Slip=  33
 NP2:       330     57       174

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