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All Journal Specta Journal of Technology Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Panggea Ghiyats Sabrian
Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Environmental Science Physics

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English: 199 - 224 Diftania Avanda Ayu Shinta; Muhammad Rizqy Septyandy; Muhammad Amin Syam; Aji Muhammad Rifqi Abdillah; Pridawanti Ayuningtyas; Panggea Ghiyats Sabrian
SPECTA Journal of Technology Vol. 10 No. 2 (2026): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v10i2.8481915

Abstract

The Sambutan District in Samarinda, East Kalimantan, has a hilly terrain with varying slopes and mainly consists of soft sedimentary materials, making it prone to landslides. Without prompt management, these landslides could cause significant damage. This study aims to identify high-risk landslide areas in Sambutan District to guide authorities in implementing mitigation measures and minimizing potential losses. The research combined field surveys and laboratory tests, including Cone Penetration Tests (CPT) at key points to evaluate soil stratigraphy and strength through cone resistance. These findings were correlated with physical soil analyses, which measured water content, specific gravity, bulk density, and Atterberg limits (liquid, plastic, and shrinkage limits). A direct shear test was also conducted to determine soil shear strength parameters, cohesion (c) and internal friction angle (φ), to assess slope stability using the safety factor (FK). Based on these tests, landslide risk was categorized into low, medium, and high, considering factors like slope angle, height, direction, rainfall, soil type, proximity to rivers and roads, as well as NDVI, NDBI, land cover, and slope curvature. These factors were analyzed with the Weight of Evidence (WoE) method. Results indicate that slope, soil type, and elevation are the most influential parameters for landslides. High-risk areas extend northward, then south, with additional zones in the northwest, southwest, and a small eastern section. Laboratory results show that soft soils, such as clay with moderate to high plasticity, are common in landslide-prone zones. The greater the soil plasticity, the higher the landslide risk. These findings provide a scientific basis for government policies and spatial planning aimed at targeted mitigation efforts to prevent further damage losses.
Analisis Deformasi Longsor Menggunakan Metode Interferometric Synthetic Aperture Radar dan Fault Fracture Density pada Jalan Poros Samboja-Sepaku Yoga Albi Ramadhani; Panggea Ghiyats Sabrian; Puspa Indah Rindawati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 4 (2026): November (In Press)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i4.2872

Abstract

The Samboja-Sepaku main road, one of the access routes to the new capital city of Nusantara (IKN), experienced a landslide in December 2024 that cut off road access. This study aims to identify the geological conditions, landslide characteristics, and ground surface deformation in the study area, and to analyze the relationship between the landslide and geological conditions, deformation derived from Interferometric Synthetic Aperture Radar (InSAR) processing, and Fault Fracture Density (FFD). Surface deformation was analyzed using the Small Baseline Subset (SBAS) InSAR method based on Sentinel-1 imagery from January 2024 to March 2026, while the density of geological structures was analyzed using the FFD method based on lineaments extracted from DEM data. The results show that the study area is composed of claystone, fine sandstone, and interbedded claystone–fine sandstone lithologies, forming a denudational landform of hills affected by moderate to severe erosion. The landslide is characterized as a translational slide involving a mixture of soil and rock material. SBAS-InSAR processing revealed subsidence-type deformation ranging from -20 to -60 mm/year at the landslide points, while FFD analysis showed lineament density dominated by high to moderate values. Zones of high deformation were associated with zones of high to moderate lineament density, indicating that fracture-related geological structures act as weak planes controlling the deformation process. The plastic, water-saturation-prone claystone lithology, combined with steep slope gradients, accelerated soil mass movement in zones with high structural density. Overall, the geological conditions and regional structures in the form of folds and faults are the main controlling factors of deformation and landslide occurrence in the study area.
Co-Authors Aji Muhammad Rifqi Abdillah Diftania Avanda Ayu Shinta Muhammad Amin Syam Muhammad Rizqy Septyandy Pridawanti Ayuningtyas Puspa Indah Rindawati Yoga Albi Ramadhani