USGS Body-Wave Moment Tensor Solution
13/02/16 22:17:31.39 Epicenter: 43.559 146.736 MW 5.3 USGS MOMENT TENSOR SOLUTION Depth 35 No. of sta: 46 Moment Tensor; Scale 10**17 Nm Mrr= 0.61 Mtt=-0.39 Mpp=-0.22 Mrt= 0.70 Mrp= 0.45 Mtp=-0.19 Principal axes: T Val= 1.05 Plg=62 Azm=327 N -0.10 0 237 P -0.95 28 147 Best Double Couple:Mo=1.0*10**17 NP1:Strike= 57 Dip=73 Slip= 90 NP2: 236 17 90
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.