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All Journal Journal Geological Processes, Risks, and Integrated Spatial Modeling
Djaya, J.H.M.
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Energy Engineering Environmental Science

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INTERAKSI VULKANIK DAN TEKTONIK DI PULAU SANGIHE DAN GUNUNG AWU: SEBUAH STUDI INTEGRATIF DALAM KONTEKS GEOLOGI INDONESIA Rachmadhan, H. D.; Djaya, J.H.M.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 1 No 2 (2023): JGPRISM: Journal Geological Processes, Risks and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

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This study delves into the geology and geodynamic processes of Sangihe Island and Mount Awu in North Sulawesi, Indonesia, within the Pacific Ring of Fire. Sangihe Island is renowned for its intensive volcanic activity and significant tectonic phenomena. The primary focus of this study is to understand the complex stratigraphy and the interaction between volcanic and tectonic processes that shape the unique geology of this region. Research methods include field observations, petrographic analysis, and data integration to reveal the history and variety of volcanic activities, as well as the diversity of rocks such as tuff, basalt, and andesite that form the island landscape through Plinian eruptions, lava flows, and pyroclastic deposits. Tectonically, Sangihe Island lies in the subduction zone between the Pacific and Eurasian Plates, creating seismic patterns and crustal deformations that are significant. The study also uncovers subsurface structures and fault systems that influence tectonic activities in the region, providing deep insights into the geodynamic processes at play. The implications of this research include geohazard risk mitigation and sustainable natural resource management. This study makes a significant contribution to understanding the geological complexity of the Pacific Ring of Fire, emphasizing the importance of interactions between volcanic and tectonic processes in shaping dynamic and hazardous geological landscapes.
GEOLOGI DAN STUDI FASIES GUNUNGAPI AWU, DAERAH BUNGALAWANG DAN SEKITARNYA, KECAMATAN TAHUNA, KABUPATEN KEPULAUAN SANGIHE, SULAWESI UTARA Djaya, J.H.M.; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 1 (2024): Journal Geological Processes, Risks, and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

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The Sangihe Islands Regency, North Sulawesi Province, is situated between the Talaud Islands Regency and Biaro Islands Regency. This region hosts several active volcanoes, such as Mount Banua Wuhu and Mount Awu, the latter being the highest point in Tahuna District. This study focuses on the volcanic geology, specifically the facies of Mount Awu, conducted in the Bungalawang area of Tahuna District. The methodology involved field surveys encompassing direct observations of surface geological conditions, followed by laboratory analysis and studies. The identification of volcanic facies was based on geomorphology, volcanic rock stratigraphy, and geological structures. Research findings indicate that the study area falls within the distal facies of Mount Awu. The stratigraphy of the area comprises units such as Volcanic Rock Unit, Tuff Santiago Breccia Insert, Santiago Tuff Insert Breccia, Tuff Manente Breccia Insert, Manente Tuff Insert Breccia, and Alluvial Unit. Geomorphological identification, geological structure analysis, and stratigraphy reveal that the study area constitutes a distal facies located at the foothills of Mount Awu. Geological structure analysis indicates the presence of fractures showing a main stress direction towards N3240E. The geological history of the study area began with the formation of the Volcanic Rock Unit due to the eruption of the ancient Sahendarumang volcano. Subsequently, a series of eruption and deposition events formed distinct stratigraphic units. This research contributes significantly to understanding the geological and geological history of the region. Its findings are applicable in various practical applications, including disaster mitigation and natural resource development. This study also serves as a foundation for further research in the field of geology, particularly Volcanology.
POTENSI GEOWISATA BERBASIS KENAMPAKAN TANJUNG DAN FENOMENA SHEETING JOINT TANJUNG LELAPIDE PULAU SANGIHE SULAWESI UTARA Rachmadhan, H.D.; Adam, H.E.S.; Djaya, J.H.M.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 1 (2024): Journal Geological Processes, Risks, and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

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Geotourism is increasingly popular in modern tourism because it allows tourists to understand and appreciate the unique geological features of a region. This study aims to explore the geotourism potential based on the cape landscape and sheeting joint phenomenon on Sangihe Island, North Sulawesi. Focusing on a case study of Cape Lelapide, the research involves field surveys, rock descriptions, joint structure analysis, geotourism analysis, and literature review. The research findings indicate that Sangihe Island has significant geotourism potential due to its stunning cape landscapes and sheeting joint phenomenon. The cape landscapes offer beautiful natural scenery, while the sheeting joint phenomenon provides evidence of tectonism based on previous studies. Tectonic features are indicated by the predominant N1200E orientation of joints from 100 measurements, interpreted as resulting from northwest-southeast directed stress, suggesting the subduction of the Philippine Plate beneath the Eurasian Plate (Molucca Sea Suture). Rock distribution at Cape Lelapide includes lava igneous rocks and occurrences of Calcite Vein and several vesicular structures indicating ancient volcanic activity of Sandarumang during the Quaternary-Tertiary period. Geotourism assessment highlights significant potential across various aspects, including scientific research, education, tourism, and risk degradation. With high value in scientific and educational aspects, coupled with promising tourism potential, this location is attractive for research and learning. However, attention is needed to address degradation risks, particularly due to its coastal location exposed to high wave erosion and inadequate legal protection.
Co-Authors Adam, H.E.S. Rachmadhan, H. D. Rachmadhan, H.D.