USGS Body-Wave Moment Tensor Solution

OFF W COAST OF NORTHERN SUMATRA

13/05/14 19:18:18.90

Epicenter:   0.775   92.437
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth  20         No. of sta: 49
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.19       Mtt=-1.78
  Mpp= 1.97       Mrt=-0.40
  Mrp= 0.06       Mtp=-3.49
 Principal axes:
  T  Val=  4.07  Plg= 3  Azm=239
  N       -0.18      84      113
  P       -3.90       5      329

Best Double Couple:Mo=4.0*10**17
 NP1:Strike= 14 Dip=84 Slip=  -1
 NP2:       104     89      -174

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