USGS WPhase Moment Solution
OFF EAST COAST OF HONSHU, JAPAN
12/ 5/20 7:20:37.00 Epicenter: 39.727 143.037 MW 6.3 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 5/20 7:20:37.00 Centroid: 39.627 143.427 Depth 11 No. of sta: 40 Moment Tensor; Scale 10**18 Nm Mrr= 1.57 Mtt=-0.35 Mpp=-1.22 Mrt= 0.49 Mrp= 2.64 Mtp=-0.28 Principal axes: T Val= 3.18 Plg=58 Azm=278 N = -0.28 1 11 P = -2.90 30 102 Best Double Couple:Mo=3.1*10**18 NP1:Strike=199 Dip=14 Slip= 97 NP2: 11 76 88
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.
