USGS Body-Wave Moment Tensor Solution
13/04/20 13:12:50.78 Epicenter: 50.120 157.313 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 22 No. of sta:131 Moment Tensor; Scale 10**18 Nm Mrr= 0.95 Mtt=-0.30 Mpp=-0.64 Mrt= 0.58 Mrp= 0.81 Mtp=-0.31 Principal axes: T Val= 1.40 Plg=66 Azm=308 N -0.12 2 214 P -1.28 24 123 Best Double Couple:Mo=1.3*10**18 NP1:Strike= 34 Dip=69 Slip= 92 NP2: 208 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.