USGS WPhase Moment Solution
OFF W COAST OF NORTHERN SUMATRA
12/06/23 21:27:28 Epicenter: 2.613 90.491 MW 5.5 USGS/WPHASE CENTROID MOMENT TENSOR 12/06/23 21:27:28.00 Centroid: 2.613 90.390 Depth 11 No. of sta: 22 Moment Tensor; Scale 10**17 Nm Mrr= 0.02 Mtt=-0.61 Mpp= 0.60 Mrt= 1.00 Mrp=-0.02 Mtp=-1.64 Principal axes: T Val= 1.94 Plg=18 Azm= 50 N = 0.14 60 284 P = -2.08 21 148 Best Double Couple:Mo=2.0*10**17 NP1:Strike=189 Dip=61 Slip= -2 NP2: 280 88 -150
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.
