Activity of caldera formation and evaluation of potential of geothermal resources in Bali Island, Indonesia

2017 Fiscal Year Final Research Report

• Project/Area Number: 26303020
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 海外学術
• Research Field: Earth system and resources engineering
• Research Institution: Fukuoka University
• Principal Investigator: Taguchi Sachihiro 福岡大学, 理学部, 教授 (00108771)
• Co-Investigator(Kenkyū-buntansha): 渡邊 公一郎 九州大学, 工学研究院, 教授 (10182916) ; 糸井 龍一 九州大学, 工学研究院, 学術研究員 (50108768) ; 奥野 充 福岡大学, 理学部, 教授 (50309887) ; 小林 哲夫 鹿児島大学, 理工学研究科, 教授 (70112430)
• Research Collaborator: KOBAYASHI Tetsuo 鹿児島大学, 名誉教授 ; Harijoko Agung ガジャマダ大学, 工学部, 准教授 ; Warmada I Wayan ガジャマダ大学, 工学部, 准教授
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: インドネシア / バリ島 / ブヤン－ブラタンjカルデラ / 火山層序 / 放射年代測定 / 地熱 / 地化学 / 資源評価

Outline of Final Research Achievements

In and out of the Buyan-Bratan caldera,southern part has been reported to be younger in volcanic activities. However, our research revealed that there are at least 3 times of eruptions in the caldera during Holocene.
Hot springs on the southern slope of the caldera were interpreted that those were formed by the mixing of waters derived from the caldera. Obtained geochemical characteristics of hot springs and associated gases suggest that independent upflow zone is existing below the hot springs. Holocene volcanic activities revealed by this research sugget that there is a possibility of existence of volcanic fluids in the caldera area, but our results suggest that the hot spring area is evaluatted to be worth to make an exploration of geothermal resorces.

Free Research Field

地熱地質