USGS Body-Wave Moment Tensor Solution

OFF W COAST OF NORTHERN SUMATRA

13/01/09 21:05:01.76

Epicenter:   0.749   92.709
MW 5.2

USGS MOMENT TENSOR SOLUTION
Depth  19         No. of sta:  8
Moment Tensor;   Scale 10**16 Nm
  Mrr= 0.85       Mtt=-6.33
  Mpp= 5.48       Mrt=-0.94
  Mrp= 0.18       Mtp=-5.11
 Principal axes:
  T  Val=  7.42  Plg= 4  Azm=249
  N        0.89      83      119
  P       -8.31       5      340

Best Double Couple:Mo=7.9*10**16
 NP1:Strike= 25 Dip=83 Slip=  -1
 NP2:       115     89      -173

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