M 6.4 - 8 km SSE of Ciudad Cortés, Costa Rica

Felt (V) at Puerto Cortes; (IV) at Puerto Jimenez and Perez Zeledon; (III) at San Jose; (II) at Atenas and Orotina. Felt in most of Costa Rica. Slight damage (V) at Puerto Armuelles, Panama. Felt (IV) at David and Bajo, Panama. Depth from broadband displacement seismograms. FAULT PLANE SOLUTION: P-Waves NP1:Strike=103 Dip=65 Slip=78 NP2:Strike=310 Dip=28 Slip=114 Principal Axes: (T) Plg=68 Azm=350 (P) Plg=19 Azm=202 Comment: The focal mechanism is moderately well controlled and corresponds to normal faulting with a small right-lateral strike-slip component. The preferred fault plane is NP2. RADIATED ENERGY No. of sta: 7 Focal mech. F Energy 2.5+0.9*10**13 Nm CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 16S, 43C M.W.: 11S, 18C Centroid Location: Origin Time 01:23:19.7 0.3 Lat 8.95N 0.02 Lon 83.48W 0.03 Dep 15.0 FIX Half-duration 6.0 Moment Tensor; Scale 10**18 Nm Mrr=3.36 0.05 Mtt=-2.35 0.05 Mff=-1.01 0.06 Mrt=2.56 0.24 Mrf=-0.09 0.20 Mtf=1.49 0.05 Principal Axes: (T) Val=4.38 Plg=68 Azm=347 (N) Val=-0.37 Plg=14 Azm=113 (P) Val=-4.01 Plg=17 Azm=207 Best Double Couple:Mo=4.2*10**18 NP1:Strike=317 Dip=30 Slip=118 NP2:Strike=106 Dip=64 Slip=75