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Geophysical methods to characterize a mass movement event in tropical soils in Campos do Jordão City, BrazilNormal access

Authors: Cassiano Antonio Bortolozo, Laura Vanessa Araque Lavalle and Marcio Roberto Magalhães de Andrade
Journal name: First Break
Issue: Vol 36, No 8, August 2018 pp. 71 - 73
Special topic: Near Surface Geoscience
Language: English
Info: Article, PDF ( 1Mb )
Price: € 30

Every year landslides happen in Brazil, causing injuries and deaths. Generally, the events are fast and destructive, and it is the natural disaster that kills the most people in Brazil (UFSCCEPED, 2012). However, there are landslide types which occur more slowly and progressively, and keep going for several years. They are called rotational landslides. In Brazil, there are several cities at risk of landslide events, usually located in mountainous areas with high precipitation, which unfortunately represent the most populous areas of the country. Campos do Jordão, located in São Paulo state is one of these cities (IG-CEDEC, 2014; IPT-CPRM, 2014). Landslide events happen every year in this touristic city. However, besides the fast landslides, the city also has rotational landslides, that might last for years. The Federal Institution for Science and Technology (IFECT) is one of the places that suffers from this problem. This study area has been occupied since 1930, but during the last decade, the city has grown as a consequence of a higher number of constructions in the area. For the IFECT construction it was necessary to excavate the slope to level the ground. This had the effect of making landslides more risky. The main idea to prevent the landslides was the construction of a retaining wall at school. However, it was not an efficient solution. The aim of this study is understand the landslides that occurred between 2002 and 2017, through geophysics data acquired in the area. The retaining wall did not resist landslides events. It moved and was partially buried, serving as a starting point for the mass movement.

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