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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Ilmiah Geologi pangea
Bayuaji, Giri
Unknown Affiliation
Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Analisis Multi-Geohazard dengan Metode Multi-Criteria Decision Analysis di Kawasan Ibu Kota Nusantara (IKN), Kalimantan Timur, Indonesia Naufal, Muhammad Adi; Bayuaji, Giri; Absari, Hirundini Rustica; Kurniawan, Fathoni Tri
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.13489

Abstract

The relocation capital city of Indonesia from Jakarta to the Nusantara Capital City is in North Penajam Paser Regency (Sepaku District) and Kutai Kartanegara (Samboja District and parts of Loa Kulu, Loa Janan and Muara Jawa Districts), East Kalimantan Province. The emergence of new centers of activity in the region led to increased vulnerability to geological hazards. Analysis of potential geological hazards is important to identify areas that have a high risk of these threats. This study combines the concept of "multi-hazard" to determine the overall potential of geological hazards in the development area of the Nusantara Capital City using the Multi-Criteria Decision Analysis method. Based on the geological conditions and history of disaster events in Nusantara Capital City, it can be concluded that this area has three geological hazards (multi-geohazard) that have a high potential to become a disaster, namely earthquakes, landslides, and floods. The results of the multi-criteria decision analysis on each geological hazard resulted in the fact that Penajam District has a high level of geological hazard compared to other sub-districts in the Nusantara Capital City area with a hazard threat level of less than 20%. This shows that in the development of the Nusantara Capital City area can be categorized as safe.
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): Article In Press-JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

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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 Absari, Hirundini Rustica Asep Saepuloh Dedy Wijnarko Kurniawan, Fathoni Tri Maryudhaningrum, Santika Tristi Naufal, Muhammad Adi Pamumpuni , Astyka