USGS Centroid Moment Solution
EASTERN HONSHU, JAPAN
11/04/11 08:16:13.15 Epicenter: 36.987 140.399 MW 6.6 USGS CENTROID MOMENT TENSOR 11/04/11 08:16:33.50 Centroid: 37.196 140.329 Depth 10 No. of sta: 102 Moment Tensor; Scale 10**19 Nm Mrr=-1.18 Mtt= 0.66 Mpp= 0.51 Mrt=-0.08 Mrp=-0.22 Mtp=-0.27 Principal axes: T Val= 0.87 Plg= 2 Azm= 38 N 0.34 8 128 P -1.21 81 295 Best Double Couple:Mo=1.0*10**19 NP1:Strike=119 Dip=44 Slip=-102 NP2: 316 48 -79
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 form 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.
