USGS/SLU Regional Moment Solution
11/02/18 08:13:35.29 ARKANSAS Epicenter: 35.271 -92.378 MW 4.1 USGS/SLU REGIONAL MOMENT TENSOR Depth 5 No. of sta: 22 Moment Tensor; Scale 10**14 Nm Mrr=-0.21 Mtt= 8.65 Mpp=-8.44 Mrt=-7.25 Mrp=-3.04 Mtp= 9.88 Principal axes: T Val= 16.80 Plg=25 Azm=156 N -3.83 65 332 P -12.96 1 65 Best Double Couple:Mo=1.5*10**15 NP1:Strike=198 Dip=72 Slip= 163 NP2: 293 74 19
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 form 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.