USGS Body-Wave Moment Tensor Solution
NEAR EAST COAST OF HONSHU, JAPAN
13/02/19 12:27:38.46 Epicenter: 35.253 140.917 MW 5.3 USGS MOMENT TENSOR SOLUTION Depth 20 No. of sta: 46 Moment Tensor; Scale 10**17 Nm Mrr= 0.57 Mtt=-0.75 Mpp= 0.18 Mrt= 0.79 Mrp= 0.51 Mtp=-0.34 Principal axes: T Val= 1.07 Plg=61 Azm=309 N 0.24 12 62 P -1.30 26 158 Best Double Couple:Mo=1.2*10**17 NP1:Strike= 58 Dip=72 Slip= 77 NP2: 274 22 125
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.