USGS WPhase Moment Solution
SOUTH OF PANAMA
12/06/04 3:15:25 Epicenter: 5.508 -82.468 MW 6.3 USGS/WPHASE CENTROID MOMENT TENSOR 12/06/04 03:15:25.00 Centroid: 5.308 -82.468 Depth 11 No. of sta: 14 Moment Tensor; Scale 10**18 Nm Mrr=-0.01 Mtt= 2.77 Mpp=-2.76 Mrt= 0.81 Mrp=-0.11 Mtp= 1.49 Principal axes: T Val= 3.32 Plg=12 Azm=346 N = -0.15 75 141 P = -3.17 5 255 Best Double Couple:Mo=3.2*10**18 NP1:Strike= 30 Dip=77 Slip= 175 NP2: 121 85 13
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.
