USGS Body-Wave Moment Tensor Solution

OFF W COAST OF NORTHERN SUMATRA

12/01/10 18:36:59.49

Epicenter:   2.452   93.209
MW 7.1

USGS MOMENT TENSOR SOLUTION
Depth  25         No. of sta: 67
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.12       Mtt=-1.93
  Mpp= 2.05       Mrt= 0.17
  Mrp= 0.53       Mtp=-5.39
 Principal axes:
  T  Val=  5.82  Plg= 3  Azm=235
  N       -0.11      84        1
  P       -5.72       5      145

Best Double Couple:Mo=5.8*10**19
 NP1:Strike=190 Dip=89 Slip=  -6
 NP2:       280     84      -179

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