USGS/SLU Regional Moment Solution
13/09/02 21:52:38.70 Epicenter: 31.927 -94.434 MW 4.2 USGS/SLU REGIONAL MOMENT TENSOR Depth 4 No. of sta: 29 Moment Tensor; Scale 10**15 Nm Mrr= 0.29 Mtt= 2.17 Mpp=-2.46 Mrt=-0.06 Mrp=-0.90 Mtp=-0.61 Principal axes: T Val= 2.25 Plg= 2 Azm= 8 N 0.56 74 104 P -2.80 16 277 Best Double Couple:Mo=2.6*10**15 NP1:Strike= 54 Dip=77 Slip=-170 NP2: 321 80 -13
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.