USGS Body-Wave Moment Tensor Solution
NEAR EAST COAST OF HONSHU, JAPAN
13/05/18 05:47:59.11 Epicenter: 37.745 141.494 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 35 No. of sta:101 Moment Tensor; Scale 10**17 Nm Mrr= 5.95 Mtt=-1.68 Mpp=-4.27 Mrt= 3.04 Mrp= 5.08 Mtp=-1.52 Principal axes: T Val= 8.56 Plg=66 Azm=303 N -1.01 2 208 P -7.55 24 117 Best Double Couple:Mo=8.1*10**17 NP1:Strike= 29 Dip=69 Slip= 92 NP2: 202 21 84
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.