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All Journal Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) JURNAL METEOROLOGI DAN GEOFISIKA Indonesian Journal of Physics (IJP) Journal of Engineering and Technological Sciences
Hendra Grandis
Faculty Of Mining And Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132
Aerospace Engineering Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Mathematics Physics

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Deformation under a Young Volcanic Covered Area in Southern Garut, Indonesia: Insight from 3D Gravity Modelling Ilham Arisbaya; Edy Wijanarko; Prihadi Sumintadireja; Warsa Warsa; Hendra Grandis
Journal of Mathematical and Fundamental Sciences Vol. 55 No. 3 (2024)
Publisher : Directorate for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2024.55.3.3

Abstract

Destructive earthquakes are frequently related to inland active faults. In recent years, a significant number of shallow earthquakes with low magnitude have occurred in southern Garut, West Java, Indonesia. Two earthquakes, with magnitudes of M4.2 and M3.9 in 2016 and 2017, respectively, have caused significant damage and were interpreted as indications of an active fault. We used publicly available gravity data to infer the subsurface structure that may be related to recent seismic activity. We used spectral analysis and filtering techniques for the regional-residual anomaly separation and anomaly enhancement to show the basin structure in the study area. 3D gravity inversion modelling was performed to obtain the subsurface density distribution. The result indicates the sedimentary layers with a density of 2.4 to 2.5 gr/cm3 with an underlying basement with a density of 2.65 gr/cm3. An intra-basin basement high with an NE-SW trend divides the basin into two sub-basins. This local basement high can be associated with a magmatic intrusion body and a series of young volcanic bodies located at the northeastern end of the basin. Our results emphasize a possible strong interaction between the tectonic and magmatic activities in this region.
Analysis of Gravity Data for Basement Depth Estimation of the Western Part of Java Island, Indonesia Ananda, Riski; Azhari, Na'ila Yuni; Rahadinata, Tony; Grandis, Hendra
Journal of Engineering and Technological Sciences Vol. 58 No. 1 (2026): Vol. 58 No. 1(2026): February
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.1.1

Abstract

Studying the basement depth and fault structures is crucial for understanding basin geometry and fluid migration pathways. This study aims to understand basin geometry using gravity data in the Banten area, Indonesia, as a region with possible hydrocarbon prospects. Anomaly gradients derived from the Bouguer anomaly were conducted for fault analysis. Meanwhile, basement depth estimation was performed using Euler deconvolution, with a Structural Index (SI) of 0 and window sizes of 7 km × 7 km and 10 km × 10 km. Additionally, 3D inversion modelling with Grablox 1.6 was applied to model the sediment-basement interface. The anomaly gradient results correlate well with regional fault structures, and local structures align with high-gradient areas in southern Banten. Furthermore, high-gradient values are associated with hydrocarbon seep locations, indicating fractures or faults transporting hydrocarbons. The depth estimations of Euler deconvolution cannot accurately identify the discontinuities forming the basin. However, they align reasonably well with the sediment-basement interface of the density model. The model reveals basin structures up to 7.8 km deep in the Bogor Basin and its surroundings, consistent with low residual anomaly areas, aiding in the early estimation of lateral basin boundaries.
Co-Authors Accep Handyarso Akhmad Syaripudin Azhari, Na'ila Yuni Dahrin, Darharta Darharta Dahrin Darharta Dahrin Diky Irawan Djoko Santoso Edy Wijanarko Edy Wijanarko Handyarso, Accep Hidayat Hidayat Ilham Arisbaya Irawati, Selvi Misnia Mezak Arnold Ratag Nanang T. Puspito Prihadi Sumintadiredja Prihadi Sumintadireja Prihadi Sumintadireja Prihadi Sumintadireja Rahadinata, Tony Riski Ananda, Riski Saiful Akhyar Lubis Sumintadireja, Prihadi Sumintadireja, Prihadi Sungkono Sungkono Supriyanto Rohadi Wahyudi W. Parnadi Wahyudi W. Parnadi Wahyudi W. Parnadi Warsa Warsa Warsa warsa Warsa Warsa Willy Hermawan