USGS WPhase Moment Solution
KEP. MENTAWAI REGION, INDONESIA
12/09/14 4:51:48 Epicenter: -3.342 100.605 MW 6.2 USGS/WPHASE CENTROID MOMENT TENSOR 12/09/14 04:51:48.00 Centroid: -3.542 100.504 Depth 23 No. of sta: 18 Moment Tensor; Scale 10**18 Nm Mrr= 0.69 Mtt=-0.07 Mpp=-0.62 Mrt= 1.72 Mrp=-1.13 Mtp= 0.39 Principal axes: T Val= 2.23 Plg=52 Azm= 23 N = -0.07 10 127 P = -2.16 35 224 Best Double Couple:Mo=2.2*10**18 NP1:Strike=355 Dip=14 Slip= 139 NP2: 126 81 80
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.
