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All Journal Jurnal Lanskap Indonesia Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Bulletin of Geology
Astyka Pamumpuni
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Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Journal : journal of geoscience engineering environment and technology

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Segmentation of the Active Fault on the Cirebon-Semarang Segments as Revealed by DEM-Derived Geomorphic Indices Jannah, Miftahul; Pamumpuni, Astyka; Sadisun, Imam Achmad
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.15572

Abstract

This research focuses on the segmentation and tectonic activity of the Baribis-Kendeng Fault across the Cirebon to Semarang segments, revealed through the analysis of geomorphic indices derived from Digital Elevation Models (DEM). Utilizing geomorphic indices such as the Hypsometric Integral (HI), Stream Length-Gradient Index (SL), and SL/K ratio, the analysis was conducted on 33 streams crossing ten segments. The results indicate that the landscape in the research area is predominantly in the youthful stage, with HI values ranging from 0.459 to 0.492, indicating active tectonic uplift. Segments such as Ungaran and Pemalang exhibit significant tectonic activity, with high SL/K values, particularly in the Ungaran segment, where the SL/K value reaches 344.872. These findings suggest that fault activity in the region is ongoing, with stronger uplift patterns observed at the western and eastern ends of the fault, while relatively lower activity is found in the central area. This research highlights the ongoin tectonic processes shaping the region’s geomorphology and contributes to a better understanding of the active fault system in Java Island.
Geology and Identification of Freshwater Sources Using Water Resistivity Survey in Landu Village, Rote Ndao, East Nusa Tenggara, Indonesia Gunawan, Indra; Rudyawan, Alfend; Pamumpuni, Astyka; Handayani, Alfita Puspa; Hadiana, Meli; Sapiie, Benyamin; Febrianti, Adinda
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.21729

Abstract

Located within the tectonically complex Banda Arc of eastern Indonesia, Landu Island, in Rote Ndao, East Nusa Tenggara provides a unique setting to investigate the relationship between arc-continent collision, karst development, and groundwater dynamics. The island is primarily underlain by Quaternary limestones, which form the principal aquifer system. Despite this hydrogeological potential, Landu faces acute freshwater shortages, particularly during the dry season. This study combines geological field mapping with a 1D electrical resistivity survey to characterize subsurface lithology, identify groundwater-bearing units, and assess the extent of seawater intrusion. The geological survey reveals slightly southward-tilted, fossiliferous limestones that exhibit clear evidence of karstification, indicating a history of tectonic uplift and surface water infiltration. A freshwater spring—currently the main source of potable water for the local population—was documented in the southeastern part of the island, with a total dissolved solids (TDS) concentration of 924 ppm, suggesting moderate water quality. Resistivity modeling identifies two potential aquifers: a shallow zone at depths of 5.2–17.2 m, and a more extensive, deeper reservoir between 35.1–92.1 m. The shallow aquifer shows lower resistivity values, indicative of possible saltwater mixing, which correlates with historical reports of failed boreholes in this zone. In contrast, the deeper aquifer exhibits higher resistivity signatures, suggesting better preservation of freshwater and greater potential for sustainable extraction. These findings highlight the critical influence of structural controls and karst processes on groundwater storage and quality. The study emphasizes the need for careful aquifer targeting and protection measures to prevent saltwater intrusion. Future work should focus on high-resolution geophysical imaging and long-term monitoring to support resilient water resource management on Landu Island.
Quantifying the Effect of Natural Consolidation and Fluid Discharge on Land Subsidence of the Sidoarjo Mud Volcano, East Java, Indonesia Bayuaji, Giri; Saepuloh, Asep; Pamumpuni , Astyka; Dedy Wijnarko; Maryudhaningrum, Santika Tristi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.21930

Abstract

Land subsidence in the Sidoarjo Mud Volcano (SMV) area has been widely recognized as a consequence of sustained mud discharge and progressive subsurface consolidation. Earlier geodetic studies using GPS and InSAR, combined with geological and geomechanical investigations, have demonstrated persistent long‑term ground deformation, widespread flooding, and severe infrastructure damage linked to these processes. This study aims to (1) quantify spatial and temporal subsidence rates, (2) identify the dominant controlling mechanisms, and (3) estimate the relative contributions of fluid discharge and natural consolidation to total subsidence. Surface deformation was derived through time‑series analysis of Sentinel‑1A SAR data using the pair‑wise logic technique differential interferometric synthetic aperture radar (PLT‑D‑InSAR). These results were integrated with one‑dimensional (1D) consolidation modeling based on lithological coring data and mud discharge records. The PLT‑D‑InSAR analysis successfully captured detailed subsidence patterns over a wide area and shows good agreement with GPS observations (R² ≈ 0.82). The combined D‑InSAR, consolidation, and discharge analysis reveals a very strong correlation (R² ≈ 0.97), indicating that subsidence is mainly governed by fluid discharge and consolidation processes. Fluid discharge accounts for approximately 72.2% of the total subsidence, while natural consolidation contributes about 16.5%. The highest subsidence rates are concentrated near the mudflow center and are structurally influenced by the Watukosek and Siring faults. These findings highlight the dominant role of discharge‑induced deformation and provide important constraints for long‑term hazard assessment and land‑use planning in the SMV region.
Co-Authors Abdurrachman, Mirzam Alfita Puspa Handayani Asep Saepuloh Banggur, Wilfridus F S Bayuaji, Giri Benyamin Sapiie Binta, Izaza Dedy Wijnarko Estu Kriswati Faisal, Budi Febrianti, Adinda Idham Andri Kurniawan Imam Achmad Sadisun Indra Gunawan Ipranta Ipranta, Ipranta irwan meilano Kobayashi, Hirohide Kristianto liswanto Maryudhaningrum, Santika Tristi Meli Hadiana Miftahul Jannah Mohammad Zaini, Dahlan Mukdas Sofian Nareswari, Ratika Benita Purwaningrum, Rr Diah Asih Purwaningsih, Rr Diah Asih Rahmy, Widyastri Atsary Rani, Medria Shekar Rudyawan, Alfend Saina, Nazirah Shibata, Shozo Sofyan Primulyana Widjaja Martokusumo, Widjaja Yadi Yuliandi