Abstract
On the basis of a general consideration of seismicity and tectonics, the Panama Block is divided into four seismic source zones. The attenuation of observed Modified Mercalli (MM) intensity from 15 earthquakes, with epicentral intensity I 0 larger than IV, was studied, fitting the observational data to different equations published in the seismological literature. The effect of subdividing the total macroseismic area is discussed using the root-mean-square values and the coefficients in each regression formula. An attempt is made to determine the rate of absorption of the seismic energy released in each seismic source zone, as well as the influence of the seismotectonic characteristics on the propagation of the seismic hazard at different distances from the epicentre. A possible explanation for the differences in spatial attenuation of the MM intensity within the Panama Block is that the younger structure of the crust in the Panama Fracture Zone (PFZ) and the Panama Deformed Belt (PDB) contributes substantially to the absorption of seismic waves.
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