Volcanic Rock Mechanics includes papers and special lectures of the 3rd International Workshop on Volcanic Rocks, Rock Mechanics and Geo-Engineering in Volcanic Environments, which was held within the framework of the Congress ",Cities on Volcanoes6-Tenerife 2010", (Puerto de la Cruz, Tenerife, Spain, 31 May - 4 June 2010). The book is a comprehensive collection of the most relevant topics related to rock mechanics and geo-engineering in volcanic environments, including:- Geomechanical characterization of volcanic materials,- Instabilities in volcanic islands: Slope stability, large landslides and collapse phenomena,- Geoengineering and infrastructures in volcanic environments,- Construction materials.Volcanic Rock Mechanics is of interests to academics, engineers, consultants, designers, contractors and professionals involved in rock mechanics and geo-engineering in volcanic environments.