USGS Body-Wave Moment Tensor Solution
13/01/01 07:35:50.50 Epicenter: 46.892 151.096 MW 5.1 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 15 Moment Tensor; Scale 10**16 Nm Mrr= 3.55 Mtt= 0.99 Mpp=-4.54 Mrt= 2.30 Mrp=-1.62 Mtp=-2.56 Principal axes: T Val= 5.64 Plg=53 Azm= 26 N -0.04 37 196 P -5.60 5 290 Best Double Couple:Mo=5.6*10**16 NP1:Strike=170 Dip=59 Slip= 46 NP2: 52 51 140
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.