USGS WPhase Moment Solution

NORTHERN SUMATRA, INDONESIA

13/01/21 22:22:54

Epicenter:   4.961   96.082
MW 6.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/01/21 22:22:54.00
Centroid:    4.861   95.882
Depth  13         No. of sta: 17
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.31       Mtt=-1.01
  Mpp= 1.33       Mrt=-0.58
  Mrp=-0.16       Mtp=-0.59
 Principal axes:
  T  Val=  1.47  Plg= 0  Azm= 76
  N     =  0.00      62      167
  P     = -1.47      27      346

Best Double Couple:Mo=1.5*10**18
 NP1:Strike=125 Dip=70 Slip=-160
 NP2:        28     71       -20

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

Details on the W-phase inversion algorithm.