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
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.
