USGS WPhase Moment Solution
COLOMBIA
13/ 2/ 9 14:16:6.00 Epicenter: 1.142 -77.361 MW 6.9 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/ 9 14:16: 6.00 Centroid: 1.142 -77.361 Depth 150 No. of sta: 27 Moment Tensor; Scale 10**19 Nm Mrr= 0.14 Mtt=-0.53 Mpp= 0.39 Mrt=-0.88 Mrp=-1.19 Mtp= 2.84 Principal axes: T Val= 3.46 Plg=23 Azm=129 N = -0.51 65 315 P = -2.95 2 220 Best Double Couple:Mo=3.2*10**19 NP1:Strike=268 Dip=72 Slip= 16 NP2: 173 75 161
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.
