USGS Body-Wave Moment Tensor Solution

OFF W COAST OF NORTHERN SUMATRA

13/05/02 19:40:52.50

Epicenter:   2.741   91.565
MW 5.4

USGS MOMENT TENSOR SOLUTION
Depth  16         No. of sta: 29
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.16       Mtt=-1.42
  Mpp= 1.27       Mrt= 0.14
  Mrp=-0.17       Mtp=-0.86
 Principal axes:
  T  Val=  1.55  Plg= 8  Azm= 73
  N        0.13      81      272
  P       -1.68       3      164

Best Double Couple:Mo=1.6*10**17
 NP1:Strike=209 Dip=82 Slip=   4
 NP2:       118     86       172

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