USGS Body-Wave Moment Tensor Solution
NEAR EAST COAST OF HONSHU, JAPAN
12/12/29 14:59:36.82 Epicenter: 38.767 142.093 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 34 No. of sta: 53 Moment Tensor; Scale 10**17 Nm Mrr= 1.18 Mtt=-0.37 Mpp=-0.81 Mrt= 0.67 Mrp= 1.03 Mtp=-0.40 Principal axes: T Val= 1.72 Plg=66 Azm=304 N -0.13 1 212 P -1.59 24 121 Best Double Couple:Mo=1.7*10**17 NP1:Strike= 32 Dip=69 Slip= 91 NP2: 209 21 87
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.