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All Journal Indonesian Journal of Geography Majalah Geografi Indonesia Sumatra Journal of Disaster, Geography and Geography Education Journal of Applied Geology Journal of the Civil Engineering Forum

Gayatri Indah Marliyani

Department Of Geological Engineering, Universitas Gadjah Mada

Author-ID : 643886

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Updated Segmentation Model of the Aceh Segment of the Great Sumatran Fault System in Northern Sumatra, Indonesia Aulia Kurnia Hady; Gayatri Indah Marliyani
Journal of Applied Geology Vol 5, No 2 (2020)
Publisher : Geological Engineering Department Universitas Gadjah Mada

We study the Aceh Fault segment, the northernmost segment of the Great Sumatran Fault in western Indonesia. The Aceh Fault segment spans 250 km long, passing through three districts: West Aceh, Pidie Jaya, and Aceh Besar, a region of ~546,143 population. The current segmentation model assumes that the Aceh Fault segment acts as a single fault segment, which would generate closer to an M8 earthquake. This estimation is inconsistent with the ~M6–7 historical earthquake data. We conduct a detailed active fault mapping using an ~8 m resolution digital elevation model (DEM) of DEMNAS and sub-m DEM data from UAV-based photogrammetry to resolve this fault’s segmentation model. Our study indicates that the Aceh Fault is active and that the fault segment can be further divided into seven sub-segments: Beutong, Kuala Tripa, Geumpang, Mane, Jantho, Indrapuri, and Pulo Aceh. The fault kinematics identified in the field is consistent with right-lateral faulting. Our study’s findings provide new information to understand the fault geometry and estimate potential earthquakes’ maximum magnitude along the Aceh Fault segment. These are important for the development of seismic hazard analysis of the area.

Subsurface Geology and Hydrothermal Alteration of The “X” Geothermal Field, West Java: A Progress Report Peter Pratistha Utama; Pri Utami; Gayatri Indah Marliyani; Randy Wijaya Atmaja
Journal of Applied Geology Vol 6, No 1 (2021)
Publisher : Geological Engineering Department Universitas Gadjah Mada

“X” geothermal field is one of the geothermal fields in West Java. PT. Y (Persero) developed it since 2014. The geothermal field has produced electricity, with installed capacity amounted to 55 MWe. The “X” geothermal system is vapor-dominated. The geothermal manifestations are located at approximately 2,100 m asl. The “X” field consists of three main upflow zones: Kawah Putih, Kawah Ciwidey, and Kawah Cibuni. This study analyzed the drill cuttings from 3 wells as the primary data with total depths ranging from 1,581 to 2,166 m with the well’s highest stable temperatures measured of ±230°C. The three wells selected for this research—Well A, Well B, and Well C—were analyzed to describe the rock properties and estimate the prospect areas of present-day geothermal exploration in the “X” geothermal field.The paper aims to understand better of the subsurface geology and its correlation to the dynamic processes (i.e., hydrothermal alteration) in the “X” geothermal field. The hydrothermal minerals are formed by near-neutral pH fluids and are characterized by quartz, calcite, clays (smectite, illite, chlorite), wairakite, epidote, and actinolite. Acidic fluids are evident by forming acidic hydrothermal mineral, e.g., anhydrite at various depths of the studied wells, particularly at Well C which is located around Sugihmukti-Urug area. Moreover, the previous studies by Reyes (1990), Layman and Soemarinda (2003), Rachmawati et al. (2016), Elfina (2017) on hydrothermal minerals, geothermal manifestation characteristics, fluid geochemistry, and conceptual model are adapted to improve the analysis and interpretation of this paper.

Co-Authors Agung Setianto Ardha, Yusufa Kholifa Atmaja, Randy Wijaya Aulia Kurnia Hady Dwikorita Karnawati Hady, Aulia Kurnia Helmi, Hurien Hurien Helmi Iman Satyarno Jihad, Abdi Kambali, Retno Agung Prasetyo Klinger, Yann Kurniawan, Telly Peter Pratistha Utama Pri Utami Pri Utami Randy Wijaya Atmaja Rusdin, Andi Azhar Setiawan, Yosi Siti Nur’aini Sugito, Zulham Supriyanto Rohadi, Supriyanto Triyono, Rahmat

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