USGS Body-Wave Moment Tensor Solution

NORTHERN SUMATRA, INDONESIA

13/01/21 22:22:53.80

Epicenter:   4.949   96.082
MW 6.0

USGS MOMENT TENSOR SOLUTION
Depth   8         No. of sta: 38
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.09       Mtt=-1.20
  Mpp= 1.11       Mrt= 0.03
  Mrp= 0.39       Mtp=-0.21
 Principal axes:
  T  Val=  1.26  Plg=18  Azm=265
  N       -0.03      72       76
  P       -1.22       3      174

Best Double Couple:Mo=1.2*10**18
 NP1:Strike=308 Dip=75 Slip= 169
 NP2:        41     79        15

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