Implementasi Seismik Refraksi Metode Hagiwara untuk Pendeteksian Bidang Gelincir di Sempadan Sungai Daerah Perumahan Sungai Bangek

Humaira Aryanti Khaidir; Ahmad Fauzi Pohan

doi:10.25077/jfu.14.6.554-560.2025

Authors

Humaira Aryanti Khaidir Departemen Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas
Ahmad Fauzi Pohan Departemen Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.14.6.554-560.2025

Keywords:

Bidang gelincir, Metode Hagiwara, Seismik Refraksi

Abstract

The rapid development in the riparian zone of the Bangek River, Koto Tangah District, Padang City, has the potential to increase the risk of geological hazards such as landslides. This study aims to identify the subsurface structure and the presence of slip surfaces in the riverbank area that is being developed into a residential zone, using the Hagiwara method. Data acquisition was carried out along two survey lines, oriented perpendicular and parallel to the river, with offsets of 40 m and 30 m, respectively, employing four geophones and a 10 kg hammer as the seismic source. The interpretation results from the first survey line indicate that the subsurface consists of unsaturated sand and weathered layers, with evidence of a slip surface at a distance of 0–18 m and depths ranging from 0.7–4 m. This slip surface is located within a permeable layer with a low seismic velocity (368.955 m/s), overlain by an impermeable layer with a higher velocity (642.508 m/s). Meanwhile, the second survey line reveals a relatively homogeneous structure composed of weathered layers with varying densities. The Hagiwara interpretation identifies a slip surface along the second refractor, indicating potential slope instability within the first layer characterized by a low seismic velocity (449.165 m/s), suggesting weaker rock compaction. The information regarding the presence and depth of the slip surfaces identified in this study provides an important reference for development planning to mitigate the potential risk of landslides in the Bangek River riparian zone.

References

Badan Pusat Statistik. (2018). Koto Tangah Subdistrict in Figure (A. Roza (ed.)). BPS Kota Padang.

BPS Kota Padang. (2023). Kecamatan Koto Tangah dalam Angka 2023. BPS Kota Padang, 13(1), 104–116.

E.Sheriff, R., & P.Geldart, L. (1995). Refraction Paths-Effect of Refractor Dip. In Exploration Seismology (2 ed., hal. 97). Press Syndicate of University of Cambridge.

Enisahlatun, F., Supriyadi, & Yulianti, I. (2015). Visualisasi Bawah Permukaan Tanah Menggunakan Generalized Reciprocal Method Berdasarkan Data Seismik Refraksi di Daerah Trangkil Gunungpati. In Unnes Physics Journal (Vol. 4, Nomor 2).

Hakim, & Manrulu, R. H. (2016). Aplikasi Konfigurasi Wenner dalam Menganalisis Jenis Material Bawah Permukaan. Jurnal Ilmiah Pendidikan Fisika Al-Biruni, 5(1), 95–103.

Harvia, R., Juita, E., & Despica, R. (2024). Analisis Spasial Bencana Banjir Di Kota Padang Periode Tahun 2020-2024. In Jurnal Pendidikan dan Ilmu Geografi (Vol. 9, Nomor 2, hal. 139–147). https://doi.org/https:// 10.21067/jpig.v9i2.10627

Jalnadia, W., & Pohan, A. F. (2024). Estimasi Struktur Bawah Permukaan Menggunakan Metode Seismik Refraksi Di Kawasan Pantai Padang. Jurnal Fisika Unand, 13(3), 399–405.

Jamaluddin, J., Battu, D. P., Pratikno, F. A., & Ryka, H. (2020). Interpretasi Data Seismik Refraksi Menggunakan Metode Delay Time Plus Minus Di Pantai Parang Luhu, Desa Bira Kabupaten Bulukumba. PETROGAS: Journal of Energy and Technology, 2(1), 28–36. https://doi.org/10.58267/petrogas.v2i1.30

Kementerian Pekerjaan Umum dan Perumahan Rakyat. (2015). Undang-undang No 15/PRT/M tahun 2015 tentang Organisasi dan Tata Kerja Kementerian Pekerjaan Umum dan Perumahan Rakyat.

Mubarok, H., & Umar, Z. (2023). Normalisasi Sungai Bangek Kecamatan Koto tangah Kota Padang. Abstract of Undergraduate Research, Faculty of Civil and Planning Engineering, Bung Hatta University, 2(1).

Mukhlis, M., Kustiani, I., & Widyawati, R. (2021). Penentuan Garis Sempadan Sungai dan Irigasi di Wilayah Ibukota Kabupaten Lampung Tengah. Jurnal Profesi Insinyur Universitas Lampung, 2(1), 34–39. https://doi.org/10.23960/jpi.v2n1.57

Ningsih, N. I. D. (2018). Uji Kinerja Handyviewer MC-SEIS 3 Channel Untuk Pendeteksian Lapisan Dibawah Permukaan. Integrated Lab Journal, 6(2), 9–18.

Pan, L., Chen, X., Wang, J., Yang, Z., & Zhang, D. (2019). Sensitivity Analysis of Dispersion Curves of Rayleigh Waves with Fundamental and Higher Modes. Geophysical Journal International, (216)(2), 1276–1303. https://doi.org/10.1093/gji/ggy479

Pesma, R. A., Erlangga, M. P., Putri, I. A., & Antosia, R. M. (2020). Aquifer Layer Prediction Using Seismic Refraction Method. 06(02), 91–100.

Safiq, M. (2023). Identifikasi Struktur Dangkal Dan Potensi Longsor Menggunakan Metode Seismik Refraksi Pada Kawasan Depati Coffee Kecamatan Pesisir Bukit Kota Sungai Penuh. In (Doctoral dissertation, Universitas Jambi). Teknik Geofisika, Fakultas Sains dan teknologi, Universitas Jambi.

Telford, W., Geldart, L., Sherif, R., & Krys, D. (1990). Applied Geophysics (2 ed.). Cambridge University