USGS/SLU Regional Moment Solution
12/12/28 13:50:35.56 Epicenter: -29.561 -71.101 MW 4.5 USGS/SLU REGIONAL MOMENT TENSOR Depth 55 No. of sta: 14 Moment Tensor; Scale 10**15 Nm Mrr= 5.58 Mtt=-1.59 Mpp=-3.99 Mrt=-1.13 Mrp=-4.62 Mtp= 0.03 Principal axes: T Val= 7.57 Plg=67 Azm=107 N -1.68 4 8 P -5.90 22 276 Best Double Couple:Mo=6.9*10**15 NP1:Strike=358 Dip=23 Slip= 80 NP2: 189 67 94
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.