USGS/SLU Regional Moment Solution
13/01/13 08:55:15.51 Epicenter: 39.612 25.545 MW 4.5 USGS/SLU REGIONAL MOMENT TENSOR Depth 5 No. of sta: 20 Moment Tensor; Scale 10**15 Nm Mrr= 1.90 Mtt= 3.82 Mpp=-5.72 Mrt= 1.67 Mrp=-0.13 Mtp=-3.38 Principal axes: T Val= 5.61 Plg=24 Azm= 17 N 1.20 66 204 P -6.81 3 108 Best Double Couple:Mo=6.3*10**15 NP1:Strike= 60 Dip=75 Slip= 161 NP2: 155 72 16
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.