Design of Volcanic Educational-based Natural Tourism at Giriloyo, Wukirsari Village, Imogiri District, Bantul Regency, Yogyakarta-Indonesia

Abstract

Previous study determined Giriloyo was Tertiary ancient volcano. Dyke, lava, and andesitic breccia which comprise this region strongly support the geological conditions, but the central facies of the ancient volcano had already associated with so many cracks, so that need further geotecnical handlings. Design technic for the geotecnical engineering is required to support it. This study aims to develop a geotechnical planning design in the context of a potential landslide management. On the other hand, Giriloyo has a potential volcanic educational-based tourism, supported with beautiful landscapes. The geotechnical planning design was packaged in the form of educational-based natural tourism development. Research related to the purpose has been carried out supported with geotechnical mapping to describe the carrying capacity. The results found southwest-northeast normal faults (N290-320oE), north-south shear faults (0-15oE), and oblique normal faults (northwest-southeast). All of them have potentially move to generate landslides. In anticipate the active rock movements, sloping terraces into 25-30o to obtain safety factors of at least 1.5-1.8 have been designed. Thus, the technical design to reduce the potential mass movements is addressed to obtain the natural cruising tourism. The terraces are designed to expose 5 ancient volcanic stratums, i e. Central Facies Stratum, Dyke Stratum, Lava with Hydrovolcanic Stratum, Lava with Collumnar Joints Stratum, and Agglomerates with Autoclastic Breccia Stratum. Each of these stratums is connected with a multilevel educational pathway to reduce burden on the land.