INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
capítulos de libros
Seismic and volcanic hazard in Argentina
PERUCCA L.P Y MOREIRAS, S.M.
Natural Hazards and Human-Exacerbated Disasters In Latin-America. Special volume of geomorphology: Developments in Earth surface processes
Año: 2010; p. 267 - 297
Research for evaluation of geologic hazards, especially seismic and volcanic, have generally received but little attention in Argentina. Nevertheless, the relative small work done up to the present indicates that a vast field of research has to be developed, not only from de viewpoint of the potential hazard occurrence of an earthquake with destructive features in the Argentine territory, but also from the perspective of the Neogene tectonic architecture. Earthquakes with magnitudes higher than Ms>6 are numerous in the Argentine territory. Even though these events have been analyzed, mostly in the central western provinces of this country, their effects have been underestimated in the northwestern and southern parts of it. Since the urban centres in the Argentine western and southern provinces have not experienced an explosive growth in recent years, it is feasible to recommend set up plans for reducing hazards, based on restrictions in the use of land in, undeveloped areas and following standards established for the construction of infrastructure works. This type of planning results in the best strategies to reduce the economic impact that could arise from eventual seismic and/or volcanic phenomena. In the present paper are analyzed some evidences of Quaternary faulting considered to be potential seismogenic sources, as well as the main destructive earthquakes occurred in Argentina. The types of Quaternary volcanic eruptions are described, and a preliminary sketch estimation is made about the hazard type and degree implied by the presence of active and potentially active volcanic centres in the arc and back-arc environments in the country.