USGS WPhase Moment Solution
NEAR EAST COAST OF HONSHU, JAPAN
11/03/11 5:46:23 Epicenter: 38.321 142.369 MW 9.0 USGS/WPHASE CENTROID MOMENT TENSOR 11/03/11 05:46:23.00 Centroid: 38.321 142.969 Depth 24 No. of sta:256 Moment Tensor; Scale 10**22 Nm Mrr= 1.82 Mtt=-0.13 Mpp=-1.69 Mrt= 1.34 Mrp= 3.17 Mtp=-0.56 Principal axes: T Val= 3.88 Plg=59 Azm=295 N = 0.03 2 201 P = -3.92 30 110 Best Double Couple:Mo=3.9*10**22 NP1:Strike=193 Dip=14 Slip= 81 NP2: 22 76 92
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.