USGS Body-Wave Moment Tensor Solution
SOUTH OF PANAMA
12/06/04 00:45:15.59 Epicenter: 5.286 -82.580 MW 6.2 USGS MOMENT TENSOR SOLUTION Depth 4 No. of sta: 82 Moment Tensor; Scale 10**18 Nm Mrr=-0.09 Mtt=-0.13 Mpp= 0.22 Mrt= 1.50 Mrp= 0.62 Mtp= 2.10 Principal axes: T Val= 2.90 Plg=27 Azm=317 N -0.57 55 92 P -2.33 21 215 Best Double Couple:Mo=2.7*10**18 NP1:Strike=354 Dip=55 Slip= 175 NP2: 87 86 35
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.