USGS Body-Wave Moment Tensor Solution
E. RUSSIA-N.E. CHINA BORDER REG.
13/04/05 13:00:02.77 Epicenter: 42.719 131.090 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 570 No. of sta:110 Moment Tensor; Scale 10**18 Nm Mrr= 0.88 Mtt=-0.78 Mpp=-0.10 Mrt= 0.26 Mrp=-4.15 Mtp= 0.75 Principal axes: T Val= 4.59 Plg=48 Azm= 95 N -0.63 11 352 P -3.96 40 253 Best Double Couple:Mo=4.3*10**18 NP1:Strike=283 Dip=12 Slip= 20 NP2: 173 86 101
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.