USGS Centroid Moment Solution

NORTHERN SUMATRA, INDONESIA

13/01/10 13:47:03.75

Epicenter:   4.771   95.123
MW 5.6

USGS CENTROID MOMENT TENSOR
13/01/10 13:47:24.79
Centroid:   4.506   94.842
Depth  54         No. of sta: 42
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.04       Mtt=-1.41
  Mpp=-1.63       Mrt= 0.95
  Mrp=-1.27       Mtp= 1.49
 Principal axes:
  T  Val=  3.43  Plg=76  Azm= 58
  N       -0.03       2      318
  P       -3.40      14      228

Best Double Couple:Mo=3.4*10**17
 NP1:Strike=314 Dip=31 Slip=  85
 NP2:       140     59        93

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