USGS/SLU Regional Moment Solution
12/09/07 02:37:01.75 Epicenter: -22.365 -68.279 MW 5.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 99 No. of sta: 12 Moment Tensor; Scale 10**16 Nm Mrr=-2.61 Mtt= 0.88 Mpp= 1.74 Mrt= 0.54 Mrp=-1.78 Mtp=-1.82 Principal axes: T Val= 3.66 Plg=16 Azm= 54 N -0.41 13 148 P -3.25 70 275 Best Double Couple:Mo=3.5*10**16 NP1:Strike=126 Dip=31 Slip=-115 NP2: 335 62 -76
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.