Boulders mapping by using resistivity imaging survey

摘要: Sao Paulo city is mostly settled on a sedimentary basin and its basement formed by pre-cambrian rocks, mainly gneiss. With the urban expansion these areas have been occupied important enterprises that impose relatively deep excavations, including underground parking lots, subway tunnels stations. One of problems encountered detection boulders prejudice chronogram increase final cost work. The evaluation presence typically defined using refraction seismic results are not always very precise use Ground Penetrating Radar (GPR), common in several countries (e.g. Smith Jol, 1995), limited tropical environments due to thick weathering covering high attenuation signal. MASW (Miller et al.,1999) could be applied but time consuming technique with poor horizontal resolution (Yinhe al., 2008). Nowadays, availability multielectrode resistivimeters, it possible intensively survey an area profiles fast at low cost. This paper presents application resistivity Brazil, where was used identify boulders, locate even calculate size them.