HYDROGEOLOGIC CONTROLS ON STRATOVOLCANIC GEOTHERMAL SYSTEMS

Abstract

High-temperature geothermal systems associated with stratovolcanoes (also known as composite cones) can be found at locations around the world. For example, in Indonesia, most successful geothermal developments have been completed on the lower slopes of (or adjacent to) stratovolcanoes where there are surface manifestations of a hydrothermal system.
Understanding the hydrogeology of a stratovolcano provides insight into the feasibility of developing a geothermal resource for power generation. This paper presents global examples of successful development of stratovolcanic geothermal systems, and focuses on the key hydrological and geological characteristics necessary for development of stratovolcanic geothermal systems including surface manifestations, recency of eruption, depth to basement, depth to heat source, and groundwater flow.