USGS Body-Wave Moment Tensor Solution

PACIFIC-ANTARCTIC RIDGE

13/01/09 21:46:03.25

Epicenter: -57.050 -141.449
MW 5.5

USGS MOMENT TENSOR SOLUTION
Depth   4         No. of sta: 13
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.49       Mtt= 1.88
  Mpp=-1.38       Mrt= 0.51
  Mrp= 0.52       Mtp= 1.10
 Principal axes:
  T  Val=  2.36  Plg=13  Azm=342
  N       -0.54      69      215
  P       -1.82      16       76

Best Double Couple:Mo=2.1*10**17
 NP1:Strike=209 Dip=88 Slip=-159
 NP2:       118     69        -2

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