USGS Body-Wave Moment Tensor Solution
NEAR EAST COAST OF HONSHU, JAPAN
13/04/17 12:03:31.63 Epicenter: 38.480 141.565 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 52 No. of sta:127 Moment Tensor; Scale 10**18 Nm Mrr= 0.70 Mtt=-0.09 Mpp=-0.61 Mrt= 0.33 Mrp= 0.69 Mtp=-0.31 Principal axes: T Val= 1.03 Plg=67 Azm=296 N 0.06 0 205 P -1.08 23 115 Best Double Couple:Mo=1.1*10**18 NP1:Strike= 25 Dip=68 Slip= 91 NP2: 204 22 89
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.