Interpretasi Struktur Bawah Permukaan Menggunakan Data Anomali Medan Magnet Daerah Manifestasi Panas Bumi Sampuraga Kabupaten Mandailing Natal

Authors

  • Rita Ummi Sahida Tanjung Universitas Andalas
  • Dwi Pujiastuti Laboratorium Fisika Bumi, Departemen Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas Kampus Unand Limau Manis, Padang, 25163, Indonesia
  • Ardian Putra Laboratorium Fisika Bumi, Departemen Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas Kampus Unand Limau Manis, Padang, 25163, Indonesia

DOI:

https://doi.org/10.25077/jfu.12.4.554-560.2023

Keywords:

anomaly magnetic, caprock, outflow, geothermal, reservoir

Abstract

This research was conducted to identify the distribution of magnetic field anomalies to determine the subsurface structure of the area around Sampuraga hot springs. Magnetic field data was measured using a magnetometer in an area with dimensions of 1400 m x 1100 m with 154 points. The measurement data is a total magnetic field, and to obtain magnetic field anomaly values, corrections are made for diurnal variation and IGRF correction. Magnetic field anomaly values range from 353,1 nT to 7622,0 nT. Magnetic field anomaly data were processed using the Oasis Montaj software by reducing to the poles, upward continuation, and 2D modeling. The 2D modeling results show three layers of soil in the study area. The upper part (first and second layers) is interpreted as a caprock. This layer consists of sedimentary rock types of sandstone and clay and igneous rock in the form of granite at a depth of up to 1700 m. The lower part (third layer) is interpreted as a reservoir. This layer consists of metasedimentary volcanic rock, clay alteration, andesitic lava, and dacitic lava with a depth of up to 2030 m from the ground surface. The results of this model also interpret the fault zone as an outflow zone so that it forms manifestations on the surface. These three geothermal system components show that the Sampuraga area can be further developed and explored.

References

Grandis, H., 2009, Pengantar Pemodelan Inversi Geofisika, HAGI, Bandung.

Indratmoko, P., Nurwidyanto, M. I., dan Yulianto, T., 2009, 'Interpretasi Bawah Permukaan Daerah Manifestasi Panas Bumi Parang Tritis Kabupaten Bantul DIY Dengan Metode Magnetik', Berkala Fisika, vol. 12, no. 4, pp. 153-160.

KESDM, 2017, Potensi Panas Bumi Indonesia Jilid 1, Kementrian Energi dan Sumber Daya Mineral, Jakarta.

Kusnadi, D., Novelyarisyanti, N., dan Novianda, R., 2013, 'Karakteristik Geokimia Manifestasi Panas Bumi Daerah Sampuraga, Kabupaten Mandailing Natal, Sumatera Utara', Buletin Sumber Daya Geologi, vol. 8, no. 1, pp. 7-14.

Maulidan, I. F., 2021, 'Interpretasi Struktur Bawah Permukaan Berdasarkan Data Magnetik Daerah Panas Bumi Semurup Kabupaten Kerinci', Skripsi, Departemen Fisika Unand, Padang.

Santosa, B. J., 2013, 'Magnetic Method Interpretation to Determine Subsurface Structure Around Kelud Volcano', Indian Journal of Applied Research, vo. 3, no. 5, pp. 328-331.

Sugianto, A., Bakrun, dan Suryakusuma, D., 2007, 'Penyelidikan Terpadu Daerah Panas Bumi Sampuraga Kabupaten Mandailing Natal, Sumatera Utara', Proceeding Pemaparan Hasil Kegiatan Lapangan dan Non Lapangan Tahun 2007 Pusat Sumber Daya Geologi, Jawa Barat.

Telford, W. M., Geldart, L. P., Sheriff, R. E. & Keys, A., 1990, Applied Geophysics Second Edition. Cambridge University Press, Cambridge.

Utama, A. P., Dwinanto, A., Situmorang, J., Hikmi, M., dan Irsamukti, R., 2012, 'Green Field Geothermal Systems in Java Indonesia', Proceedings of ITB Geothermal Workshop, Institut Teknologi Bandung, Bandung.

Widodo, M., Yulianto T., Harmoko U., Yulianto G., Widada S. dan Dewantoro Y., 2016, ;Analisis Struktur Bawah Permukaan Daerah Harjosari Kabupaten Semarang Menggunakan Metode Geomagnet dengan Pemodelan 2D dan 3D', Youngster Physics Journal, vol. 5, no. 4, pp. 251-260.

Downloads

Published

2023-10-04

How to Cite

Tanjung, R. U. S., Pujiastuti, D., & Putra, A. (2023). Interpretasi Struktur Bawah Permukaan Menggunakan Data Anomali Medan Magnet Daerah Manifestasi Panas Bumi Sampuraga Kabupaten Mandailing Natal. Jurnal Fisika Unand, 12(4), 554–560. https://doi.org/10.25077/jfu.12.4.554-560.2023

Issue

Vol. 12 No. 4 (2023)

Section

Articles

License

Copyright (c) 2023 Jurnal Fisika Unand

Creative Commons License

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

Please find the rights and licenses in JFU (Jurnal Fisika Unand).

1. License

The non-commercial use of the article will be governed by the Creative Commons Attribution license as currently displayed on Creative Commons Attribution-NonCommercial 4.0 International License.

2. Authors Warranties

The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).

3. User Rights

JFU's spirit is to disseminate articles published are as free as possible. Under the Creative Commons license, JFU permits users to copy, distribute, display, and perform the work for non-commercial purposes only. Users will also need to attribute authors and JFU on distributing works in the journal.

4. Rights of Authors

Authors retain the following rights:

  • Copyright, and other proprietary rights relating to the article, such as patent rights,
  • The right to use the substance of the article in future own works, including lectures and books,
  • The right to reproduce the article for own purposes, provided the copies are not offered for sale,
  • The right to self-archive the article.

5. Co-Authorship

If the article was jointly prepared by other authors, the signatory of this form warrants that he/she has been authorized by all co-authors to sign this agreement on their behalf, and agrees to inform his/her co-authors of the terms of this agreement.

6. Termination

This agreement can be terminated by the author or JFU upon two months notice where the other party has materially breached this agreement and failed to remedy such breach within a month of being given the terminating partys notice requesting such breach to be remedied. No breach or violation of this agreement will cause this agreement or any license granted in it to terminate automatically or affect the definition of JFU.

7. Royalties

This agreement entitles the author to no royalties or other fees. To such extent as legally permissible, the author waives his or her right to collect royalties relative to the article in respect of any use of the article by JFU or its sublicensee.

8. Miscellaneous

JFU will publish the article (or have it published) in the journal if the articles editorial process is successfully completed and JFU or its sublicensee has become obligated to have the article published. JFU may conform the article to a style of punctuation, spelling, capitalization, referencing and usage that it deems appropriate. The author acknowledges that the article may be published so that it will be publicly accessible and such access will be free of charge for the readers.