USGS Body-Wave Moment Tensor Solution

NORTHERN SUMATRA, INDONESIA

13/07/02 07:37:02.15

Epicenter:   4.654   96.662
MW 6.0

USGS MOMENT TENSOR SOLUTION
Depth   8         No. of sta: 55
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.01       Mtt=-1.25
  Mpp= 1.26       Mrt=-0.11
  Mrp= 0.28       Mtp=-0.36
 Principal axes:
  T  Val=  1.37  Plg=12  Azm=262
  N       -0.07      78       97
  P       -1.30       3      352

Best Double Couple:Mo=1.3*10**18
 NP1:Strike=306 Dip=84 Slip= 169
 NP2:        38     79         6

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