USGS/SLU Regional Moment Solution
13/09/02 23:51:15.72 Epicenter: 31.917 -94.424 MW 4.3 USGS/SLU REGIONAL MOMENT TENSOR Depth 4 No. of sta: 35 Moment Tensor; Scale 10**15 Nm Mrr= 0.51 Mtt= 2.61 Mpp=-3.12 Mrt=-1.07 Mrp=-0.64 Mtp=-0.73 Principal axes: T Val= 3.09 Plg=22 Azm=184 N 0.29 65 36 P -3.37 12 279 Best Double Couple:Mo=3.2*10**15 NP1:Strike=230 Dip=83 Slip= 156 NP2: 323 66 7
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.