USGS WPhase Moment Solution
BANDA SEA
12/12/10 16:53:9.00 Epicenter: -6.521 129.813 MW 7.1 USGS/WPHASE CENTROID MOMENT TENSOR 12/12/10 16:53: 9.00 Centroid: -6.521 130.014 Depth 160 No. of sta: 70 Moment Tensor; Scale 10**19 Nm Mrr= 0.99 Mtt=-4.22 Mpp= 3.24 Mrt= 2.10 Mrp= 3.43 Mtp= 0.27 Principal axes: T Val= 5.93 Plg=37 Azm=280 N = -0.85 43 57 P = -5.08 22 171 Best Double Couple:Mo=5.6*10**19 NP1:Strike=310 Dip=45 Slip= 168 NP2: 49 81 45
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.
