USGS/SLU Regional Moment Solution
12/07/06 22:48:00.89 Epicenter: 45.660 26.603 MW 4.1 USGS/SLU REGIONAL MOMENT TENSOR Depth 98 No. of sta: 8 Moment Tensor; Scale 10**15 Nm Mrr= 1.74 Mtt=-1.49 Mpp=-0.25 Mrt=-0.87 Mrp= 0.04 Mtp= 0.42 Principal axes: T Val= 1.96 Plg=76 Azm=173 N -0.14 5 284 P -1.82 13 15 Best Double Couple:Mo=1.9*10**15 NP1:Strike=281 Dip=59 Slip= 84 NP2: 112 32 100
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.