USGS Centroid Moment Solution

OFF W COAST OF NORTHERN SUMATRA

12/01/10 18:36:59.49

Epicenter:   2.452   93.209
MW 7.2

USGS CENTROID MOMENT TENSOR
12/01/10 18:37:25.00
Centroid:   2.502   92.754
Depth  10         No. of sta: 156
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.55       Mtt=-2.70
  Mpp= 3.25       Mrt= 1.29
  Mrp=-2.69       Mtp=-5.95
 Principal axes:
  T  Val=  7.95  Plg=19  Azm= 59
  N       -1.56      70      228
  P       -6.39       3      328

Best Double Couple:Mo=7.2*10**19
 NP1:Strike=195 Dip=79 Slip=  16
 NP2:       102     74       169

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