USGS Body-Wave Moment Tensor Solution

NORTHERN SUMATRA, INDONESIA

11/09/05 17:55:11.46

Epicenter:   2.996   97.986
MW 6.7

USGS MOMENT TENSOR SOLUTION
Depth  90         No. of sta: 68
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.12       Mtt= 0.23
  Mpp=-0.10       Mrt= 0.78
  Mrp=-1.01       Mtp=-0.25
 Principal axes:
  T  Val=  1.37  Plg=40  Azm= 44
  N       -0.13      10      142
  P       -1.24      48      244

Best Double Couple:Mo=1.3*10**19
 NP1:Strike= 76 Dip=11 Slip=-157
 NP2:       323     86       -80

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