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All Journal Jurnal Penelitian Sains Jambura Geoscience Review Journal of Geosciences and Applied Geology
Nurohim, Dede
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Chemistry Earth & Planetary Sciences Engineering Mathematics Physics

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GEOPLANOLOGY MODELING IN THE PLANNING AREA OF MAJALENGKA, WEST JAVA Nurohim, Dede; Princessca, Channia; Khoirullah, Nur; Sulaksana, Nana; Waliana, Teuku Yan
Journal of Geological Sciences and Applied Geology Vol 2, No 6 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i6.20871

Abstract

Based on the geological condition, the study area consisted of carbonate sandstone units (Tmbp), claystone units (Tml), non-carbonate sandstone units (Tpbp), andesitic intrusions (Ia), volcanic breccia units (Qbv), and alluvium (Qal) units. The different types of constituent rocks will affect the innate characteristics or properties of the rock. The regional genetic units explain kinship relations between lithology, morphology, and tectonics. It is used to determine the genetic processes that occur in an area which will later be developed into the smallest units in the geological analysis. In terms of spatial planning, the geological analysis is needed to produce an ideal area in terms of water adequacy, environmental carrying capacity, and disaster. In accordance with Law No. 11 of 2011 concerning the district development plan of Majalengka, then a layout plan emerged that would be applied to the area. Especially in the research area, land suitability covers a possible area that has a value of> 131, spread in the north to the west of the research area, with high to the very high land capability to be developed. The constrained area which has a value of 121-131 is spread in the north to south of the research area, with the ability of the land to be developed. And the limitation area has a value of <121 dominating in the northwest to the southeast of the research area, with low land capacity - very low to be developed. Based on the analysis, there are still some areas that are not in accordance with the pattern of development which should be mainly the development of protected areas.
GIS-Based Landslide Susceptibility Mapping Using Weighted Overlay in Ogan Komering Ulu Juliansyah, Ilham Rahmat; Harnani, Harnani; Nurohim, Dede
Jambura Geoscience Review Vol 8, No 1 (2026): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v8i1.36391

Abstract

Landslides pose a major hazard in Ogan Komering Ulu Regency, South Sumatra, where rugged relief, high rainfall, and land-use change can reduce slope stability. This study develops a GIS-based landslide susceptibility map using the weighted overlay method to support disaster mitigation and spatial planning. Five conditioning factors—slope, rainfall, geology, soil type, and land use—were prepared as thematic layers from DEMNAS topography, CHIRPS rainfall estimates interpolated using Inverse Distance Weighting, geological shapefiles from Ina-Geoportal, soil information from the FAO–UNESCO Digital Soil Map of the World, and land-cover data from the Indonesian Base Map (RBI). Each factor was reclassified into susceptibility classes, assigned scores, and weighted according to its relative influence on landslide occurrence, then integrated through overlay analysis to produce a composite susceptibility index. The index was classified into low, moderate, and high susceptibility zones. The results indicate that moderate susceptibility dominates most of the study area, while high-susceptibility zones are concentrated in hilly to mountainous terrains with steep slopes and unfavorable geological and soil conditions. Model performance, evaluated using a landslide inventory and the Receiver Operating Characteristic curve, produced an Area Under the Curve value of 0.715, indicating moderate predictive accuracy. The susceptibility map provides actionable spatial information to prioritize monitoring and guide land-use management in Ogan Komering Ulu.
Interpretasi Lingkungan Pengendapan Berdasarkan Karakteristik Petrologi Dan Petrografi Batupasir Gampingan Dan Batuserpih Formasi Rambatan Daerah Bongas, Kecamatan Watukumpul, Pemalang, Jawa Tengah Syaputri, Hanisa Dean; Setiawan, Budhi; Nurohim, Dede
Jurnal Penelitian Sains Vol 28, No 1 (2026)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v28i1.1347

Abstract

Formasi Rambatan merupakan satuan batuan sedimen berumur Miosen Awal–Tengah yang berkembang di Zona Serayu Utara, Jawa Tengah, dan dikenal sebagai bagian dari sistem sedimentasi laut dalam. Formasi ini didominasi oleh perselingan batupasir gampingan dan batuserpih yang diendapkan melalui mekanisme aliran gravitasi bawah laut, khususnya arus turbidit. Penelitian ini bertujuan untuk menganalisis karakteristik petrologi dan petrografi batupasir gampingan dan batuserpih Formasi Rambatan di Daerah Bongas, Kecamatan Watukumpul, Kabupaten Pemalang. Metode penelitian meliputi pengamatan lapangan, analisis petrologi secara megaskopis, serta analisis petrografi menggunakan sayatan tipis batuan dengan mikroskop polarisasi. Hasil analisis menunjukkan bahwa batupasir gampingan memiliki karakteristik ukuran butir pasir halus, sortasi baik, kemas tertutup, serta tersusun oleh skeletal grain, kuarsa, feldspar, litik lempung, matriks mikrokuarsa, dan semen kalsit serta lempung. Berdasarkan klasifikasi Mount (1985), batupasir tersebut dikategorikan sebagai Allochemic Sandstone. Sementara itu, batuserpih menunjukkan dominasi matriks lempung dengan struktur laminasi dan kandungan karbonatan, serta diklasifikasikan sebagai Calcareous Mudrock berdasarkan Pettijohn (1975). Karakteristik litologi dan petrografi tersebut mencerminkan proses pengendapan laut dalam yang dipengaruhi oleh variasi energi dan suplai sedimen. Penelitian ini diharapkan dapat memberikan kontribusi dalam pemahaman karakteristik batuan dan sistem sedimentasi Formasi Rambatan di Zona Serayu Utara.
Co-Authors Budhi Setiawan Harnani, Harnani Juliansyah, Ilham Rahmat Khoirullah, Nur Nana Sulaksana Princessca, Channia Syaputri, Hanisa Dean Waliana, Teuku Yan