USGS WPhase Moment Solution
SOUTHERN PERU
12/ 6/ 7 16: 3:18.00 Epicenter: -15.919 -72.516 MW 6.1 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 6/ 7 16: 3:18.00 Centroid: -15.919 -72.516 Depth 110 No. of sta: 32 Moment Tensor; Scale 10**18 Nm Mrr= 0.34 Mtt=-0.83 Mpp= 0.49 Mrt= 0.02 Mrp=-1.08 Mtp=-0.91 Principal axes: T Val= 1.69 Plg=37 Azm= 69 N = -0.24 47 214 P = -1.45 18 325 Best Double Couple:Mo=1.6*10**18 NP1:Strike=101 Dip=50 Slip= 164 NP2: 201 78 41
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.
