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Triggering factors of landslides in Campos do Jordão city, Brazil

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Abstract

This paper focuses on the identification and analysis of the mechanisms and triggering factors of some landslides which have occurred in Campos de Jordão city, Brazil. The methodological procedures were based mainly on the recognition of the weathering profiles, recording of the landslide features, elaboration of the map of unconsolidated materials and slope and mass flow direction charts. In addition, an analysis of the rainfall data of the last 23 years was carried out. The translational type was the most common landslide that occurred, with failure surfaces between the sandy silt and sandy clay layers. Most landslides occurred in areas with slopes steeper than 30°. The rainfall data analyzed also showed that the distribution is a more important triggering factor than the amount of precipitation, such that landslides occur preferentially in the period from December to January.

Résumé

Cet article présente une analyse des processus et des facteurs déclenchants relatifs à quelques glissements de terrain qui ont eu lieu dans la ville de Campos de Jordao au Brésil. La méthodologie mise en ɶuvre a conduit à identifier les caractéristiques des glissements de terrain, caractériser des profils d'altération, élaborer une carte des matériaux sous-consolidés, une carte des pentes et des directions de propagation d'écoulements. Le glissement plan est le type de glissement le plus représenté, avec des surfaces de rupture au contact des couches de silts sableaux et d'argiles sableuses. La plupart des glissements de terrain ont eu lieu dans des régions présentant des pentes supérieures à 30°. De plus, une analyse des données pluviométriques des vingt-trois dernières années a été réalisée. Cette analyse a montré que la période des pluies représente un facteur déclenchant plus important que le total des précipitations, de sorte que les glissements de terrain ont lieu préférentiellement de décembre à janvier.

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Correspondence to Adriana Ahrendt.

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Ahrendt, A., Zuquette, L.V. Triggering factors of landslides in Campos do Jordão city, Brazil. Bull Eng Geol Environ 62, 231–244 (2003). https://doi.org/10.1007/s10064-003-0191-8

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  • DOI: https://doi.org/10.1007/s10064-003-0191-8

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