Estimasi Struktur Bawah Permukaan Menggunakan Metode Seismik Refraksi Di Kawasan Pantai Padang

Authors

  • Windi Jalnadia Andalas University
  • Ahmad Fauzi Pohan Departemen Fisika, FMIPA, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.13.3.399-405.2024

Keywords:

metode hagiwara, seismik refraksi, struktur bawah permukaan

Abstract

Peristiwa gempa bumi di Sumatera Barat menyebabkan terbentuknya retakan-
retakan di atas permukaan tanah.Kondisi tersebut tentu berpengaruh terhadap
struktur bawah permukaan tanahnya. Penelitian mengenai pemodelan struktur
bawah permukaan menggunakan metode seismik refraksi telah dilakukan.
Penelitian ini bertujuan untuk mendapatkan penampang seismik di kawasan
Pantai Padang. Jumlah lintasan padapenelitian sebanyak dua lintasan dengan panjang masing-masing lintasan 80 meterdan spasi geophone 1 meter. Data yang diperolehberupa waktu rambat sebagaifungsi jarak dan data diolah menggunakan metodeHagiwara. Hasil penelitianmenunjukkan kecepatan pada Lintasan 1 untuk lapisanpertama (v1) adalah (1111,11-1250) m/s yang diinterpretasikan sebagai batuan alluvial dan lapisan kedua didapatkan nilai kecepatan (v2) berkisar (2000-5000) m/s yang diinterpretasikan kemungkinan sebagai batu gamping, batu pasir dan batu serpih. Kedalaman yang mampu direkam pada Lintasan 1 adalah (2,9-29,53) m. Pada Lintasan 2,besarnya nilai kecepatan lapisan pertama (v1) adalah (263,16-769,23) m/sdiinterpretasikan sebagai batuan aluvial, sedangkan besarnya nilai kecepatan lapisan kedua (v2) adalah (3333,33-5000) m/s diinterpretasikan kemungkinan sebagai batu gamping, batu pasir dan batu serpih. Kedalaman yang mampu direkam pada Lintasan 2 adalah (0,16-29,87) m. Jenis batuan yang didapatkan sesuai dengan peta geologi. Padakedua lintasan terindikasi adanya amblesan atau penurunan struktur bawah permukaankarena struktur lapisan yang tidak sejajar atau horizontal antara lapisan atasdengan lapisan di bawahnya.

Author Biography

Windi Jalnadia, Andalas University

Departemen Fisika

References

Artono, V.Y. dan Sandra, R.A., 2017, Identifikasi Lapisan Lapuk Bawah Permukaan Menggunakan Seismik Refraksi di Desa Lengkeka Kecamatan Lore Barat Kabupaten Poso, Journal of Science and Technology, Vol. 6, No. 3, hal. 291-300.

Badan Meteorologi Klimatologi dan Geofisika (BMKG), 2018, Katalog Gempa bumi Signifikan dan Merusak, Jakarta.

Guedes, V.J.C.B., Maciel, S.T.R. dan Rocha, M.P., 2022, Refrapy: A Python Program for Seismic Refraction Data Analysis, Computers & Geosciences, Vol. 159, Elsevier, hal. 2-9.

Kastowo, Leo, G.W., Gafoer, S. dan Amin, T.C., 1996, Peta Geologi Lembar Padang, Sumatra, Skala 1:250.000. Publikasi Pusat Penelitian dan Pengembangan Geologi.

Kusumawardani, R., Suryolelono, K.B., Suhendro, B. dan Rifai, A., 2016, The Dynamic Response of Unsaturated Clean Sand at A Very Low Frequancy, International Journal of Technology, Vol. 7, No. 1, hal.123-131.

Niroha, O., Putra, A. dan Pohan, A.F., 2021, Pemodelan Struktur Bawah Permukaan Menggunakan Metode Seismik Refraksi di Nagari Aie Angek Kabupaten Tanah Datar, Jurnal Fisika Unand (JFU), Vol.10, No. 4, hal. 525-531.

Pulungan, Z. dan Zulfahmi., 2016, Prediksi Gerakan Tanah Menggunakan Seismik Refraksi dan Pemodelan Numerik dengan Metode Sirt dan Gauss-Seidel, Jurnal Teknologi Mineral dan Batubara, Vol. 12, No. 2, hal. 81-92.

Sismanto, 1999, Eksplorasi dengan Menggunakan Seismik Refraksi, Gadjah Mada University Press, Yogyakarta.

Sulystyaningrum, E., Khumaedi. dan Supriyadi, 2014, Aplikasi Metode Seismik Refraksi untuk Identifikasi Pergerakan Tanah di Perumahan Bukit Manyaran Permai (BPM) Semarang, Unnes Physics Journal, Vol. 3, No. 2, hal. 14-21.

Telford, W.M., Geldart, L.P., Sheriff, R.E. dan Krys, D.A., 1990, Applied geophysics, Cambridge University Press, New York.

Tohari, A., Syahbana, A.J., Satriyo, N.A. dan Soebowo, E., 2013, Karateristik Likuifaksi Tanah Pasiran Di Kotapadang Berdasarkan Metode Microtremor, Prosiding Pemaparan Hasil Penelitian Puslit Geoteknologi-LIPI, Bandung.

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Published

2024-05-01

How to Cite

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. https://doi.org/10.25077/jfu.13.3.399-405.2024

Issue

Vol. 13 No. 3 (2024)

Section

Articles

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