USGS Body-Wave Moment Tensor Solution
13/01/13 17:50:16.60 Epicenter: 26.093 -110.062 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 9 No. of sta: 8 Moment Tensor; Scale 10**18 Nm Mrr= 1.81 Mtt=-0.98 Mpp=-0.83 Mrt=-0.00 Mrp=-0.03 Mtp=-0.03 Principal axes: T Val= 1.81 Plg=90 Azm= 97 N -0.82 1 258 P -0.98 0 348 Best Double Couple:Mo=1.6*10**18 NP1:Strike=257 Dip=45 Slip= 89 NP2: 78 45 91
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.