USGS Centroid Moment Solution
NEAR EAST COAST OF HONSHU, JAPAN
11/03/11 05:46:23.82 Epicenter: 38.308 142.383 MW 9.0 USGS CENTROID MOMENT TENSOR 11/03/11 05:47:47.20 Centroid: 38.486 142.597 Depth 10 No. of sta: 151 Moment Tensor; Scale 10**22 Nm Mrr= 2.03 Mtt=-0.16 Mpp=-1.87 Mrt= 2.06 Mrp= 3.49 Mtp=-0.60 Principal axes: T Val= 4.57 Plg=58 Azm=306 N -0.05 5 208 P -4.52 32 115 Best Double Couple:Mo=4.5*10**22 NP1:Strike= 29 Dip=77 Slip= 95 NP2: 187 14 68
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.
