USGS Body-Wave Moment Tensor Solution
BISMARCK SEA
12/11/15 08:21:49.43 Epicenter: -3.255 148.179 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 41 Moment Tensor; Scale 10**17 Nm Mrr= 0.99 Mtt= 3.57 Mpp=-4.56 Mrt= 1.96 Mrp= 2.12 Mtp= 5.04 Principal axes: T Val= 7.17 Plg=24 Azm=333 N -0.04 65 173 P -7.12 8 66 Best Double Couple:Mo=7.2*10**17 NP1:Strike= 17 Dip=79 Slip= 157 NP2: 112 67 12
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.
