Subsurface structure investigation of Sangubanyu geothermal field

Abstract

Exploration of geothermal systems can be initiated from an assessment of surface manifestations. The manifestations of the Sangubanyu hot springs are scattered on the banks of the Lampir River along the 800 m. This study aims to characterize the geothermal field based on geomorphology, lithology, structure, and geohydrology. The geological investigation was done by observation and direct measurement in the field of geological phenomena, such as geomorphology: Landscape, river flow pattern and geomorphology stage; stratigraphy: Spreading and rock unit relationships, rock outcrop profile; geological structure; manifestations and geothermal symptoms on both active and fossilized surfaces. The geological structure of the study area is interpreted as a fault, and the hydrological data shows that hydrothermal water flows through the fault line below the shallow groundwater levels. Groundwater discharge in the form of springs at the research area is widespread in almost every topographical cutting or at the bottom of the valley cliff.