USGS Body-Wave Moment Tensor Solution
13/01/30 20:15:42.95 Epicenter: -28.180 -70.785 MW 6.8 USGS MOMENT TENSOR SOLUTION Depth 45 No. of sta: 75 Moment Tensor; Scale 10**19 Nm Mrr= 1.74 Mtt= 0.02 Mpp=-1.77 Mrt= 0.43 Mrp=-1.17 Mtp=-0.48 Principal axes: T Val= 2.24 Plg=67 Azm= 51 N -0.06 16 185 P -2.17 16 279 Best Double Couple:Mo=2.2*10**19 NP1:Strike= 32 Dip=33 Slip= 121 NP2: 176 62 72
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.