Identification of Sub-Fault Zone Using Magnetotelluric Inversion (Case Study: Ketaun Fault, Lemeu Village, Lebong Regency)

Authors

  • Nurul Ilmi Rahmawati Program Studi Geofisika, Jurusan Fisika, Universitas Bengkulu
  • Muchammad Farid Program Studi Geofisika, Jurusan Fisika, Universitas Bengkulu
  • Arif Ismul Hadi Program Studi Geofisika, Jurusan Fisika, Universitas Bengkulu
  • Andre Rahmat Al Ansory Program Studi Geofisika, Jurusan Fisika, Universitas Bengkulu https://orcid.org/0009-0001-8809-6937

DOI:

https://doi.org/10.70561/geocelebes.v8i2.34588

Keywords:

Fault, Lebong, Magnetotelluric, Resistivity

Abstract

Lemeu Village, Lebong Regency, borders the Bukit Barisan Mountain range and is crossed by the Ketaun Fault, which causes a high level of seismic activity, so it is necessary to conduct research on the potential existence of the Ketaun sub-fault as one of the efforts to mitigate natural disasters such as earthquakes. The Magnetotelluric method utilises the earth's natural electromagnetic field, which is used to determine the distribution of resistivity in the subsurface using the ADU-07e Magnetotelluric tool with two horizontal electrical sensors (Ex, Ey) and three horizontal (Hx, Hy) and vertical (Hz) magnetic sensors and uses seven research points with an interval of 1 km. Data processing uses MAPROS software to convert data from the time domain to the frequency domain and ZONDMT2D to obtain subsurface resistivity values. The results obtained from this study are 2D magnetotelluric cross sections showing a zone with low resistivity values between research points P4 and P5 which is thought to be a new fault zone with resistivity values ranging from 1.3 – 6.1 Ωm from a depth of 2.5 km to a depth of 10 km. The zone is assumed to be a new fault that is a branch of the Ketaun fault.

References

Adrianda, R. S., & Sutriyono, E. (2022). Kajian Struktur Geologi Daerah Muaro, Kabupaten Sijunjung, Sumatera Barat. Jurnal Geomine, 10(3), 209–219. https://jurnal.teknologiindustriumi.ac.id/index.php/JG/article/view/1283

Al Ansory, A. R., Raihana, H., Pritama, V. L., Saputri, W., Maghribi, F. B., Farid, M., Hadi, A. I., Harlianto, B., & Sugianto, N. (2023). Delineasi Nilai Resistivitas Di Lapangan Panas Bumi Tambang Sawah Menggunakan Metode Magnetotellurik. Buletin Sumber Daya Geologi, 18(3), 145–154. https://doi.org/10.47599/bsdg.v18i3.386

Ardiansyah, S. (2018). Analisis Gempabumi Merusak Kabupaten Lebong- Bengkulu 6 Desember 2017.

Arisbaya, I., Mukti, M. M., Handayani, L., Permana, H., & Schnabel, M. (2016). Tabuan-Panaitan Ridge, Trace of Sumatran Fault in the Sunda Strait based on Geophysical Data Analysis. Prosiding Pemaparan Hasil Penelitian Geoteknologi LIPI, I-33–I-39.

Arisbaya, I., Wijanarko, E., Warsa, W., Sumintadireja, P., Sudrajat, Y., Handayani, L., Mukti, M. M., & Grandis, H. (2023). Magnetotellurics (MT) and Gravity Study of a Possible Active Fault in Southern Garut, West Java, Indonesia. International Journal of Geophysics, 2023, 4482074 https://doi.org/10.1155/2023/4482074

Bahri, S., Hanif, M. F., Prihatiningrum, A., & Islam, M. (2022). Perilaku dan Ketahanan Struktur Rumah Vernakular Desa Gunung Alam Lebong terhadap Gempa Bumi. Jurnal Inersia Teknik Sipil, 14(1), 1–10. https://ejournal.unib.ac.id/inersiajurnal/article/view/18357

ESDM, P. S. G. (2023). SHP Peta Geologi Lebong.

Firdaus, M. W., Setyawan, A., & Yusuf, M. (2016). Identifikasi Letak Dan Jenis Sesar Berdasarkan Metode Gayaberat Second Vertical Gradient Studi Kasus Sesar Lembang, Kota Bandung, Jawa Barat. Youngster Physics Journal, 5(1), 21–26. https://ejournal3.undip.ac.id/index.php/bfd/article/view/10629

Fitrida, S. M., Sampurno, J., Ivansyah, O., & Kholid, M. (2015). Identifikasi Struktur Bawah Permukaan Berdasarkan Metode Magnetotellurik di Kawasan Panas Bumi Wapsalit Kabupaten Buru Provinsi Maluku. Positron, 5(1), 11–18. https://doi.org/10.26418/positron.v5i1.9733

Fitzpatrick, R. (2010). Maxwells equations and the principles of electromagnetism. Laxmi Publications, Ltd.

Gafoer, S., Amin, T. C., & Pardede, R. (1992). Geologi lembar Bengkulu, Sumatera, Pusat Penelitian dan Pengembangan Geologi.

Hadi, A. I., & Brotopuspito, K. S. (2016). Estimasi Kedalaman Bidang Batas Sesar dari Data Gravitasi di Daerah Rawan Gerakan Tanah (Studi Kasus: Sesar Sumatra Segmen Musi Bengkulu). SIMETRI, Jurnal Ilmu Fisika Indonesia, 2(2), 2207-37–2207-42. https://jsimetri.wordpress.com/wp-content/uploads/2016/07/j-simetri-v2-no2-2016-07-arifunib-37-42.pdf

Harahap, Z. A., Haryanto, A. D., Firmansyah, Y., & Alfadli, M. K. (2022). Determinasi Zona Reservoir Dengan Data Magnetotelurik Di Zona Prospek Panas Bumi Telaga Ngebel, Jawa Timur. Padjadjaran Geoscience, 6(2), 803–811. https://jurnal.unpad.ac.id/geoscience/article/view/41415

Hidayat, A. R., Junursyah, L. G., & Asep, H. (2016). Analisis Deret Waktu Untuk Peningkatan Kualitas Data Magnetotelurik (Studi Kasus Lapangan Geothermal). Proseding Seminar Nasional Fisika dan Aplikasinya, November, 1–10.

Lubis, A. M., Butarbutar, D. C., Suhendra. S., & Samdara, R. (2019). Investigasi Sudut Pergerakan Sesar di Musi Kepahiang dengan Menggunakan Metode Geolistrik. Jurnal Meteorologi dan Geofisika, 20(2), 67–72. https://doi.org/10.31172/jmg.v20i2.543

Muflihah, I. (2014). Distribusi Dan Pola Sesar Daerah Kepala Burung (Papua Barat). Jurnal Neutrino, 6(2), 91–98. https://doi.org/10.18860/neu.v0i0.2588

Mulyati, R., Suryana, V. A., & Wulandari, D. A. (2020). Identifikasi Sesar Aktif Terhadap Pembangunan Bendungan Di Provinsi Aceh (NAD). Ruang Teknik Journal, 3(1), 94–98. https://jurnal.umsb.ac.id/index.php/RANGTEKNIKJOURNAL/article/view/1684

Muttaqien, I., & Nurjaman, J. (2021). Two-Dimensional Inversion Modeling Of Magnetotelluric (Mt) Synthetic Data Of A Graben Structure Using SimPEG. RISET Geologi dan Pertambangan, 31(1), 1–12. https://doi.org/10.14203/risetgeotam2021.v31.1121

Natawidjaja, D. H. (2018). Updating active fault maps and sliprates along the Sumatran Fault Zone, Indonesia. IOP Conference Series: Earth and Environmental Science, 118(1), 012001. https://doi.org/10.1088/1755-1315/118/1/012001

Pratama, R., Resta, I. L., Farid, F., & Joni, W. (2021). Identifikasi Lapisan Bawah Permukaan Daerah Prospek Panas Bumi Songa-Wayaua Berdasarkan Metode Magnetotelurik. Jurnal Meteorologi dan Geofisika, 22(2), 45–53. https://doi.org/10.31172/jmg.v22i2.786

PUSGEN. (2017). Peta Sumber dan Bahaya Gempa Indonesia Tahun 2017 (Map of Indonesia Earthquake Sources and Hazards in 2017). Pusat Studi Gempa Nasional.

Putra, I. D., Nasution, R. A. F., Harijoko, A. (2017). Aplikasi Landsat 8 Oli/Tirs Dalam Mengidentifikasi Altrasi Hidrotermal Skala Regional : Studi Kasus Daerah Rejang Lebong dan Sekitarnya, Provinsi Bengkulu. Prosiding Seminar Nasional Kebumian Ke-X, 10, 1812–1826.

Rais, L. N. (2021). Analisis Bencana Gempa Bumi Dan Mitigasi Bencana Di Daerah Kertasari. Jurnal Samudra Geografi, 4(2), 14–19. https://doi.org/10.33059/jsg.v4i2.3773

Rizal, M., Ismail, N., Yanis, M., Muzakir, M., & Surbakti, M. S. (2019). The 2D resistivity modelling on north sumatran fault structure by using magnetotelluric data. IOP Conference Series: Earth and Environmental Science, 364(1), 012036. https://doi.org/10.1088/1755-1315/364/1/012036

Setyani, A. (2017). Investigasi bawah permukaan segmen cibeber zona sesar cimandiri, jawa barat dengan metode audio magnetotelurik (amt). Universitas Islam Negeri Syarif Hidayatullah Jakarta.

Sieh, K., & Natawidjaja, D. (2000). Neotectonics of the Sumatran fault, Indonesia. Journal of Geophysical Research: Solid Earth, 105(B12), 28295–28326. https://doi.org/10.1029/2000jb900120

Supartoyo, S., Suntoko, H., Bondan, A., & Alhakim, E. E. (2019). Analisis Morfotektonik dan Pemetaan Geologi pada Identifikasi Sesar Permukaan di daerah Plampang, Pula Rakit, Provinsi Nusa Tenggara Barat. Jurnal Pengembangan Energi Nuklir, 21(1), 45–52. http://dx.doi.org/10.17146/jpen.2019.21.1.5461

Syaputra, E. W., Refrizon, R., & Zakariya, H. (2023). Identifikasi Sesar Segmen Ketahun Berdasarkan Metode First Horizontal Derivative (FHD) dan Second Vertical Derivative (SVD) Data Anomali Gaya Berat GGMplus. Jurnal Fisika Unand, 12(4), 598–607.

Telford, W. M., Geldart, L. P., & Sheriff, R. E. (1990). Applied Geophysics. Cambridge University Press.

Türkoğlu, E., Unsworth, M., Bulut, F., & Çağlar, İ. (2015). Crustal structure of the North Anatolian and East Anatolian Fault Systems from magnetotelluric data. 241, 1–14. https://doi.org/10.1016/j.pepi.2015.01.003

van Bemmelen, R. W. (1949). The Geology of Indonesia, The Hague.

Wulandari, J. C., Gaffar, E.Z., Zulaikah, S., N. A. P. (2017). Penentuan Struktur Litologi Daerah Panasbumi Probolinggo Menggunakan Metode Magnetotellurik (MT).

Zhang, L., Unsworth, M., Jin, S., Wei, W., Ye, G., Jones, A. G., Jing, J., Dong, H., Xie, C., Le Pape, F., & Vozar, J. (2015). Structure of the Central Altyn Tagh Fault revealed by magnetotelluric data: New insights into the structure of the northern margin of the India-Asia collision. Earth and Planetary Science Letters, 415, 67–79. https://doi.org/10.1016/j.epsl.2015.01.025

Downloads

Published

2024-10-01

How to Cite

Rahmawati, N. I. ., Farid, M., Hadi, A. I., & Al Ansory, A. R. (2024). Identification of Sub-Fault Zone Using Magnetotelluric Inversion (Case Study: Ketaun Fault, Lemeu Village, Lebong Regency). JURNAL GEOCELEBES, 8(2), 132–141. https://doi.org/10.70561/geocelebes.v8i2.34588

Issue

Vol. 8 No. 2: October 2024

Section

Articles

License

Copyright (c) 2024 JURNAL GEOCELEBES

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Authors who publish with this journal agree to the following terms:

  1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
  2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).