USGS Centroid Moment Solution

NORTHERN SUMATRA, INDONESIA

13/07/02 07:37:02.18

Epicenter:   4.670   96.640
MW 6.1

USGS CENTROID MOMENT TENSOR
13/07/02 07:37:17.90
Centroid:   4.831   96.346
Depth  10         No. of sta: 53
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.04       Mtt=-1.31
  Mpp= 1.27       Mrt= 0.46
  Mrp= 0.64       Mtp=-0.50
 Principal axes:
  T  Val=  1.57  Plg=21  Azm=264
  N        0.04      60       35
  P       -1.61      20      166

Best Double Couple:Mo=1.6*10**18
 NP1:Strike= 35 Dip=90 Slip=  30
 NP2:       305     60       180

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