USGS WPhase Moment Solution
NEAR EAST COAST OF HONSHU, JAPAN
11/03/09 2:45:18 Epicenter: 38.510 142.792 MW 7.3 USGS/WPHASE CENTROID MOMENT TENSOR 11/03/09 02:45:18.00 Centroid: 38.510 142.992 Depth 35 No. of sta:138 Moment Tensor; Scale 10**19 Nm Mrr= 4.67 Mtt=-0.33 Mpp=-4.34 Mrt= 3.23 Mrp= 8.06 Mtp=-1.31 Principal axes: T Val= 9.86 Plg=59 Azm=294 N = 0.03 2 200 P = -9.89 30 109 Best Double Couple:Mo=9.9*10**19 NP1:Strike=192 Dip=14 Slip= 81 NP2: 21 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.