USGS Body-Wave Moment Tensor Solution

NORTHERN SUMATRA, INDONESIA

13/01/10 13:47:03.75

Epicenter:   4.788   95.122
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth  40         No. of sta: 56
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.88       Mtt=-1.37
  Mpp=-2.50       Mrt= 2.31
  Mrp=-1.37       Mtp= 1.59
 Principal axes:
  T  Val=  4.82  Plg=70  Azm= 18
  N       -0.45      10      137
  P       -4.38      17      230

Best Double Couple:Mo=4.6*10**17
 NP1:Strike=335 Dip=29 Slip= 111
 NP2:       132     63        79

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