Indeks Kerentanan Seismik Daerah Perbukitan dan Pemukiman di Bukit Nobita Kota Padang Menggunakan Data Mikrotremor

Authors

  • Fani Anjelina Departemen Fisika, Universitas Andalas
  • Ahmad Fauzi Pohan Departemen Fisika, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.13.4.511-517.2024

Keywords:

Seismic vulnerability index, Dominant frequency, amplification, HVSR

Abstract

Research on the seismic vulnerability index on Nobita Hill, Padang City uses the microtremor method. The study was conducted in two areas, namely hilly and residential areas around Nobita Hill. Measurements were carried out using a geophone with three components, a north-south horizontal component, an east-west horizontal component and an up-down vertical component at 7 points in hilly areas and 9 points in residential areas with a recording duration of 30 minutes. The measurement results were then processed using the Horizontal Vertical Spectral Ratio (HVSR) method using Geopsy software and mapped using Surfer 11. The research results show that the Nobita Hill area and the settlements around the hill are not vulnerable to seismicity because both research areas have a small category of seismic vulnerability index. This is characterized by dominant frequency values in the hills ranging from 0.633 - 0.935 Hz, amplification from 0.905 - 1.306, and seismic vulnerability index from 1.234 - 2.622. In residential areas, dominant frequency values
were found ranging from 0.645 - 2.983 Hz, amplification from 1.109 - 1.316, and seismic vulnerability index from 0.438 - 1.974. This indicates that both studies are safe in the event of an earthquake. 

References

Annisa, N., & Pohan, A. F. (2023). Evaluasi Kondisi Jembatan Kuranji dengan Metode Horizontal To Vertical Spectral Ratio dan Pergerakan Partikel. Jurnal Fisika Unand, 12(3), 381-387.

Arif, M., Pujiastuti, D., & Pohan, A. F. (2024). Pemodelan 3D Bidang Gelincir Tanah Longsor Menggunakan Metode Geolistrik di Bukit Nobita Padang. Jurnal Fisika Unand, 13(1), 15-21.

Asri, W., Suharno, S., & Rustadi, R. (2018). Pemetaan mikrozonasi daerah rawan gempabumi menggunakan metode hvsr daerah painan sumatera barat. Jurnal Geofisika Eksplorasi, 4(1), 31-45.

BMKG. (1998). Sumberdaya Geologi, Buletin Meteorologi dan Geofisika, No 4.

Brigham, E. O. (1988). The fast Fourier transform and its applications. Prentice-Hall, Inc.

Fadillah, A., & Budiman, A. (2023). Identifikasi Pola Redistribusi Tanah Untuk Pendugaan Erosi Berdasarkan Nilai Suseptibilitas Magnetik di Daerah Bukit Nobita Kota Padang. Jurnal Fisika Unand, 12(4), 639-645.

Fäh, D., Kind, F., & Giardini, D. (2001). A theoretical investigation of average H/V ratios. Geophysical Journal International, 145(2), 535-549.

Fauziah, L., & Pohan, A. F. (2023). Identifikasi Potensi Longsor di Kota Sawahlunto dengan Menggunakan Parameter Frekuensi Dominan, Amplifikasi, dan Kecepatan Gelombang Geser. Jurnal Fisika Unand, 12(3), 342-348.

Irham, M. N., Zainuri, M., Yuliyanto, G., & Wirasatriya, A. (2021). Measurement of ground response of Semarang coastal region risk of earthquakes by Horizontal To Vertical Spectral Ratio (HVSR) microtremor method. Journal of Physics: Conference Series, 1943(1), 12033.

Kumar, S., Singh, P., Sushil, R., Singh, P., & Tiwari, A. (2021). Microtremor measurement to evaluate site characteristics by horizontal to vertical spectral ratio technique in Sikkim, Northeast Himalayas, India. Quaternary International, 585, 134-142.

Latue, P. C., Sihasale, D. A., & Rakuasa, H. (2023). Pemetaan Daerah Potensi Longsor di Kecamatan Leihitu Barat, Kabupaten Maluku Tengah, Menggunakan Metode Slope Morphology (SMORPH). INSOLOGI: Jurnal Sains Dan Teknologi, 2(3), 486-495.

Lestari, F. P., Pujiastuti, D., & Arifin, H. (2016). Analisis Indeks Kerentanan Tanah di Wilayah Kota Padang (Studi Kasus Kecamatan Padang Barat dan Kuranji). Jurnal Fisika Unand, 5(1), 42-46.

Nakamura, Y. (1989). A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. Railway Technical Research Institute, Quarterly Reports, 30(1).

Ratdomopurbo, A., Subandriyo, S. Y., & Suharna. (2008). Pedoman Pemetaan Mikrozonasi, Badan Geologi Dapertemen Energi dan Sumberdaya Mineral. Dapertemen Energi Dan Sumberdaya Mineral.

Refrizon, R., Hadi, A. I., Lestari, K., & Oktari, T. (2013). Analisis Percepatan Getaran Tanah Maksimum dan Tingkat Kerentanan Seismik Daerah Ratu Agung Kota Bengkulu. Prosiding SEMIRATA 2013, 1(1).

Saaduddin, Sismanto, & Marjiyono. (2015). Pemetaan Indeks Kerentanan Seismik Kota Padang Sumatera Barat dan Korelasinya Dengan Titik Kerusakan Gempabumi 30 September 2009. Seminar Nasional Kebumian Ke-8, Universitas Gajah Mada.

Tohari, A., & Wardhana, D. D. (2018a). Mikrozonasi seismik wilayah Kota Padang berdasarkan pengukuran mikrotremor. RISET Geologi Dan Pertambangan, 28(2), 205-220.

Tohari, A., & Wardhana, D. D. (2018b). Seismic Microzonation of Padang City Based On Microtremor Measurements. Riset Geologi Dan Pertambangan, 28(2), 205-220.

Wafa, A., & Astuti, E. S. (2016). Pemetaan Daerah Rawan Longsor Berbasis GIS di Kota Batu. Jurnal Informatika Polinema, 2(4), 144.

Yassar, M. F., Nurul, M., Nadhifah, N., Sekarsari, N. F., Dewi, R., Buana, R., Fernandez, S. N., & Rahmadhita, K. A. (2020). Penerapan Weighted Overlay Pada Pemetaan Tingkat Probabilitas Zona Rawan Longsor di Kabupaten Sumedang, Jawa Barat. Jurnal Geosains Dan Remote Sensing, 1(1), 1-10.

Downloads

Published

2024-07-01

Issue

Vol. 13 No. 4 (2024)

Section

Articles

License

Copyright (c) 2024 Fani Anjelina

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.