USGS Centroid Moment Solution
BANDA SEA
12/10/08 11:43:35.30 Epicenter: -4.515 129.081 MW 6.2 USGS CENTROID MOMENT TENSOR 12/10/08 11:43:44.59 Centroid: -4.674 129.021 Depth 21 No. of sta: 92 Moment Tensor; Scale 10**18 Nm Mrr= 2.74 Mtt=-1.84 Mpp=-0.91 Mrt=-0.57 Mrp= 1.03 Mtp= 1.25 Principal axes: T Val= 3.02 Plg=76 Azm=258 N -0.12 9 128 P -2.90 11 37 Best Double Couple:Mo=3.0*10**18 NP1:Strike=116 Dip=35 Slip= 74 NP2: 315 56 101
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.
