Identifikasi Bidang Gelincir Longsor Berdasarkan Metode Electrical Resistivity Tomography (ERT) di Desa Tolango, Kabupaten Gorontalo Utara

Tya Ivanka Hiola, Ahmad Zainuri, Ronal Hutagalung

Abstract


This study aims to analyze the geological conditions and landslide potential in Tolango Village, Anggrek District, North Gorontalo Regency. The research area is predominantly composed of two main lithological units: andesite and alluvial deposits. Field observations, petrographic analysis, and structural measurements were carried out to determine the geological characteristics. In addition, geoelectrical surveys using the Electrical Resistivity Tomography (ERT) method were conducted to interpret subsurface conditions. The results show that the upper layer (1.25–3.75 m) consists of clayey soil with low resistivity values (8.10–100 Ωm), while the lower layer (up to 15.9 m) is composed of andesite bedrock with higher resistivity values (101–7,600 Ωm). A potential slip surface was identified at the contact between these two layers, which becomes critical when water infiltration increases during the rainy season. Structural features such as thrust faults and joints were also observed, indicating tectonic influence on slope instability. Overall, the integration of geological and geophysical data confirms that the area is highly susceptible to landslides, particularly on steep slopes with impermeable clay-rich layers overlying resistant bedrock.


Keywords


Landslide potential, Electrical Resistivity Tomography, Andesite, Alluvial deposits, Slip surface

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References


Bachri, S., Pramudyo, D., & Wibowo, A. (2019). Analysis of landslide susceptibility based on geological and rainfall data in volcanic areas of Indonesia. Journal of Geological Hazard and Risk Management, 10(2), 123–134. https://doi.org/10.1016/j.jhgm.2019.03.005

BNPB. (2020). Data Informasi Bencana Indonesia Tahun 2020. https://bnpb.go.id

Kim, H. J., Lee, S. Y., & Park, J. K. (2022). Influence of land use change on landslide susceptibility in tropical volcanic regions. Environmental Earth Sciences, 81(12), 345. https://doi.org/10.1007/s12665-022-10400-7

Liao, S., Wu, S., & Huang, W. (2019). Slope stability assessment combining geological and geophysical data: Case study in tropical terrain. Engineering Geology, 258, 105144. https://doi.org/10.1016/j.enggeo.2019.105144

Lin, C., Zhang, M., & Wang, L. (2023). Role of tectonic structures on landslide occurrence in tropical mountainous areas. Geomorphology, 415, 108264. https://doi.org/10.1016/j.geomorph.2023.108264

Nguyen, T. H., Tran, V. T., & Pham, H. T. (2021). Application of Electrical Resistivity Tomography for landslide investigation in tropical areas. Journal of Applied Geophysics, 188, 104326. https://doi.org/10.1016/j.jappgeo.2021.104326

Rickard, L. V. (2020). Tectonic controls on landslide occurrence in tropical volcanic regions. Geomorphology, 374, 107454. https://doi.org/10.1016/j.geomorph.2020.107454

Singh, R., Sharma, G., & Kumar, A. (2020). Use of geophysical techniques in landslide hazard assessment: A case study. Environmental Earth Sciences, 79, 175. https://doi.org/10.1007/s12665-020-8874-3

Travis, B. J., & Carlson, J. B. (2017). The influence of lithology on slope stability in volcanic terrains. Engineering Geology, 220, 123–134. https://doi.org/10.1016/j.enggeo.2017.01.007

Wang, J., Zhang, L., & Liu, Q. (2019). Effect of soil moisture on slope stability in tropical mountainous areas. Landslides, 16(4), 765–776. https://doi.org/10.1007/s10346-018-1129-6

Zhang, Y., Zhao, P., & Chen, H. (2021). Impact of lithology and weathering on landslide susceptibility in volcanic terrains. Geomorphology, 394, 107885. https://doi.org/10.1016/j.geomorph.2021.107885




DOI: https://doi.org/10.37905/jage.v4i2.32373

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Copyright (c) 2025 Tya Ivanka Hiola, Ahmad Zainuri, Ronal Hutagalung

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