USGS Centroid Moment Solution
BISMARCK SEA
12/12/29 07:59:15.73 Epicenter: -3.327 148.770 MW 5.9 USGS CENTROID MOMENT TENSOR 12/12/29 07:59:52.20 Centroid: -3.104 148.566 Depth 10 No. of sta: 56 Moment Tensor; Scale 10**18 Nm Mrr=-0.06 Mtt= 0.72 Mpp=-0.65 Mrt=-0.01 Mrp=-0.16 Mtp= 0.72 Principal axes: T Val= 1.03 Plg= 3 Azm=157 N -0.05 81 45 P -0.98 9 247 Best Double Couple:Mo=1.0*10**18 NP1:Strike= 22 Dip=86 Slip=-171 NP2: 292 81 -4
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.
