USGS Centroid Moment Solution
NORTHERN SUMATRA, INDONESIA
11/09/05 17:55:11.46 Epicenter: 2.996 97.986 MW 6.8 USGS CENTROID MOMENT TENSOR 11/09/05 17:55:24.70 Centroid: 2.545 97.848 Depth 50 No. of sta: 115 Moment Tensor; Scale 10**19 Nm Mrr=-0.45 Mtt= 0.33 Mpp= 0.12 Mrt= 1.27 Mrp=-1.53 Mtp=-0.31 Principal axes: T Val= 2.08 Plg=38 Azm= 46 N -0.06 4 140 P -2.02 52 235 Best Double Couple:Mo=2.0*10**19 NP1:Strike=107 Dip= 8 Slip=-122 NP2: 320 83 -86
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.
