SEISMIC WAVE AMPLIFICATION BY LOCAL EFFECTS IN SANTA FE DE BOGOTA AND ARMENIA, COLOMBIA

摘要

Since the past 70s, part of the damages caused by many earthquakes around the world, especially to diverse types of civil engineering works, has been explained by the incidence of local site conditions, expressed as topographic forms and changes in earth materials. Many researchers have developed numeric models that show the generation of amplification of the seismic signals (R, SH and SV waves) due to these local conditions. This paper includes two examples where the topographic effect in the ground seismic response has been evaluated. In the first case, the existing information from the Santa Fe de Bogota Seismic Microzonation project (INGEOMINAS, Universidad de los Andes, 1997) was used to infer future building behavior in the city. In the second case the incidence of the topographic forms of creeks is studied for the city of Armenia, Quindio, to try to explain great damage concentration in those places resulting from the Quindio Earthquake that occurred on January 25st, 1999. For this purpose, bidimensional finite element models were analyzed, using the actual geometry of the two sites, dynamic soil tests recently completed and accelerograms registered by the Colombian National Seismological Network (Red Sismologica Nacional de Colombia - RSNC).