USGS/SLU Regional Moment Solution
13/05/06 03:13:43.06 Epicenter: 42.613 -111.944 MW 3.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 13 No. of sta: 85 Moment Tensor; Scale 10**14 Nm Mrr=-5.08 Mtt= 0.97 Mpp= 4.11 Mrt= 4.71 Mrp=-6.82 Mtp=-0.54 Principal axes: T Val= 8.78 Plg=31 Azm= 65 N 1.35 7 331 P -10.13 58 229 Best Double Couple:Mo=9.5*10**14 NP1:Strike=329 Dip=76 Slip= -97 NP2: 177 16 -63
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.