Abstract
The city of Rio de Janeiro is well-known for its outstanding landscape, particularly the several steep rocky domes that emerge close to the coast. Such a wonderful scene results from a combination of differential weathering controlled by the presence of a variety of Neoproterozoic gneisses and Cambrian granites and strong valley incision along subvertical faults and fractures. In this chapter we present the geological and geomorphological aspects that influence the daily life of more than 12 million inhabitants of the Rio de Janeiro metropolitan region, in two areas around Guanabara Bay: Coastal Massifs and the Serra dos Orgaos escarpment. The combination of such topographic constraints, intense summer rainstorms, and dense occupation frequently creates a scenario with a high potential for landslide-derived hazards.
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