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All Journal IJOG : Indonesian Journal on Geoscience Journal of Physics and Its Applications
Rina Dwi Indriana
Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Semarang
Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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The Mass Distribution of Soputan Volcano Based on Gravity Data Dave Emmanuel Haning; Agus Setyawan; Rina Dwi Indriana
Journal of Physics and Its Applications Vol 4, No 2 (2022): May 2022
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i2.13230

Abstract

The gravity method is a passive method based on the density measurement among sediment. This method is usually applied to identify the condition of the earth’s subsurface. Soputan Volcano is located in District Minahasa Tenggara. Soputan Volcano is included in type A Volcano or stratovolcano and it stands at 1783.7 MSL. This research aims to identify the distribution of subsurface mass (sediment density) of Soputan. The data used was Data from satellite GGmPlus and elevation data of ERTM which was corrected to ellipsoid reference. 3D inversion modeling applied Grablox software. The complete value of the Bouguer anomaly obtained was 110 – 162 mGal. The density result obtained from the inversion model was 2.3 g/cm3 to 2.95 g/cm3. The sediment that could be identified was andesite sediment and basalt sediment. Based on that result, the layer arranging Soputan Volcano consists of many variations of mass in each depth grouped into andesite, breccia, basalt, andesite-basaltic, lava, breccia, and tuff.
Subsurface Modeling Using Gravity Data in Southern Yogyakarta and Its Implications for The May 26th, 2006 Earthquake Muhammad Irham Nurwidyanto; Tony Yulianto; Rina Dwi Indriana; Adelia Nanda Pramudya
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.487-501

Abstract

The Yogyakarta region is one of the most seismically vulnerable areas in Indonesia, so detailed subsurface fault characterization is crucial for effective disaster mitigation strategies. Previous studies have recognized the Opak Fault as the main structure controlling seismicity in this area, but the geometry and existence of other fault systems remain less constrained. This study aims to delineate the subsurface density variations associated with fault zones and rock deformation. This study develops a two-dimensional gravity inversion model to refine the subsurface configuration of faults in southern Yogyakarta. Gravity data were processed through standard corrections and anomaly separation to generate a complete Bouguer anomaly and residual anomalies. The results show that residual anomalies (-60 to 100 mgal) successfully delineate lithological variations, where older volcanic units (Semilir, Nglanggeran, and Sambipitu Formations) produce positive density contrasts (0.4-0.85 g/cm³), while younger Merapi deposits display negative contrasts (-0.5 to -0.05 g/cm³). Importantly, the 2D model highlights not only the Opak Fault but also the Ngalang Fault to the east, spatially coinciding with the 26th May 2006 earthquake epicentre. This finding provides new evidence of the structural complexity in southern Yogyakarta and emphasizes the role of the Ngalang Fault in regional seismicity, offering an updated basis for seismic hazard assessment in the area.
Co-Authors Adelia Nanda Pramudya Agus Setyawan Dave Emmanuel Haning Muhammad Irham Nurwidyanto Tony Yulianto