Procesos de remoción en masa inducidos por el terremoto del 27F de 2010 en la franja costera de la Región del Biobío, Chile

Abstract

Mass removal process (MRP) are studied, triggered by the 8.8Mw mega-earthquake of 27F 2010, at the coast of Concepción, in Biobío Region, Chile. 22 events are morphometrically evaluated on the field and theirs hazard factors are explained. The types of MRP identified were: rock and soil detachment, rockslide, landslide, lateral spreading and mix mass removal processes. Local factors as determinants of the MRP seem to be strongly influenced by topographic slopes, slope management, soil moisture, lithological and tectonic. It is concluded that the density of MRP increases with the proximity to the epicenter, but the number and size of MRP are not comparable with the magnitude of the earthquake; this aspect would be related to the relief features and the low soil moisture, since the earthquake occurred in summer (dry season of the Mediterranean climate).