USGS/SLU Regional Moment Solution
13/01/08 14:16:08.55 Epicenter: 39.677 25.536 MW 5.7 USGS/SLU REGIONAL MOMENT TENSOR Depth 10 No. of sta: 25 Moment Tensor; Scale 10**17 Nm Mrr=-0.01 Mtt= 4.42 Mpp=-4.41 Mrt= 0.18 Mrp=-1.20 Mtp=-2.55 Principal axes: T Val= 5.15 Plg= 5 Azm= 16 N 0.17 77 130 P -5.33 12 284 Best Double Couple:Mo=5.2*10**17 NP1:Strike= 61 Dip=78 Slip=-175 NP2: 330 86 -12
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.