Earthquake Decay Analysis to Determine the Afters Thock end Time in West Sumatra in 2021-2023 Using The Omori-Utsu Method
DOI:
https://doi.org/10.61132/uranus.v3i2.780Keywords:
Aftershock duration, Earthquake decay, Omori-Utsu law, West SumatraAbstract
West Sumatra, situated at the convergence of the Indo-Australian and Eurasian tectonic plates, experiences frequent earthquakes and aftershocks due to the complex geological setting. This study utilizes the Omori-Utsu method, a modified version of Omori’s law by seismologist Tokiji Utsu, to estimate aftershock duration. Data on aftershocks from significant earthquakes (magnitude ≥5.5M) between 2021 and 2023 were accessed through the BMKG earthquake catalog. The study finds that aftershock durations vary significantly depending on the earthquake's tectonic origin. The longest recorded aftershock duration occurred after the West Pasaman earthquake on February 22, 2022, lasting 21 days, while the shortest was one day following the Mentawai earthquake on September 11, 2022. These variations highlight the influence of tectonic structures on aftershock activity, with subduction zones exhibiting shorter decay times. This research provides critical insights into earthquake behavior, aiding in disaster preparedness and mitigation strategies for the West Sumatra region.
References
Ali, A. A. (2021). Relokasi Hiposenter Gempabumi Daerah Lombok dan Sekitarnya Menggunakan Metode Double Difference.
Ariyanto, P., & Januarti, Y. (2020). Aftershock decay analysis of the 5th August 2020 Sumba earthquake. Prosiding Seminar Nasional Fisika (SNF), 4, 111–116.
Asnita, W., Sugiyanto, D., & Rusydy, I. (2016). Kajian Statistik Seismisitas Kawasan Sumatera. Jurnal Natural, 16(2), 11–12.
Dahlia, B., Ngatijo, N., Dewi, I. K., Kurniawan, S. E., & SP, S. Y. (2022). Relokasi Hiposenter Gempabumi Dengan Menggunakan Metode Double Difference Serta Implikasinya Terhadap Seismotektonik Di Wilayah Sumatera Barat. JTK (Jurnal Teknik Kebumian), 7, 18–25.
Dewanto, B. G., Priadi, R., Heliani, L. S., Natul, A. S., Yanis, M., Suhendro, I., & Julius, A. M. (2022a). The 2022 Mw 6.1 Pasaman Barat, Indonesia Earthquake, Confirmed the Existence of the Talamau Segment Fault Based on Teleseismic and Satellite Gravity Data. Quaternary, 5(4), 45.
Dewanto, B. G., Priadi, R., Heliani, L. S., Natul, A. S., Yanis, M., Suhendro, I., & Julius, A. M. (2022b). The 2022 Mw 6.1 Pasaman Barat, Indonesia Earthquake, Confirmed the Existence of the Talamau Segment Fault Based on Teleseismic and Satellite Gravity Data. Quaternary, 5(4). https://doi.org/10.3390/quat5040045
Gutenberg, B. (1955). Channel waves in the Earth’s crust. Geophysics, 20(2), 283–294.
Hilmi, I. L., Sutrisno, S., & Sunarya, D. (2019). Analisis Seismisitas Berdasarkan Data Gempa Bumi Periode 1958-2018 Menggunakan b-Value Pada Daerah Selatan Jawa Barat dan Banten. Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics, 2(1), 10–16.
Islamiati, V. N., Supardiono, S., Perdana, Y. H., & Setyahagi, A. R. (2020). Analisis Peluruhan Gempa Bumi Susulan Di Ambon Tahun 2019 Dengan Pendekatan Statistik Menggunakan Software Peluruhan V2. 0. Inovasi Fisika Indonesia, 9(2), 163–172.
Madrinovella, I., Widiyantoro, S., & Meilano, I. (2011). Relokasi Hiposenter Gempa Padang 30 September 2009 Menggunakan Metode Double Difference. JTM, 18(1).
Natawidjaja, D. H., & Triyoso, W. (2007). The Sumatran Fault Zone-From Source To Hazard. In Journal of Earthquake and Tsunami (Vol. 1, Issue 1). http://www.tectonics.caltech.edu/sumatra/sumatranfault.htm.
Pahlevi, M. I. (2020). Waktu Berakhirnya Gempa Bumi Susulan Untuk Gempa Bumi Sulawesi 28 September 2018. Universitas Islam Negeri Syarif Hidayatullah.
Putra, R. R. (2021). Karakteristik Gempa Foreshock dan Aftershock Pada Sumber Gempa Intraplate Berdasar Distribusi Kejadain Gempa (Studi Kasus: Gempa Padang 2009 dan Gempa Padang Panjang 2007). CIVED, 8(2), 76–84.
Salamah, M. D. (2018). Analisa Momen Tensor Dan Pola Bidang Sesar Pada Zona Subduksi Di Wilayah Sumatera Barat Dari Event Gempa Pada Tahun 2014-2017. Institut Teknologi Sepuluh Nopember.
Sari, R., Wirma, A., Malago, J. D., & Ihsan, N. (2012). Analisis Rekahan Gempa Bumi dan Gempa Bumi Susulan dengan Menggunakan Metode Omori. Jurnal Sains Dan Pendidikan Fisika, 8(3), 319175.
Shcherbakov, R., Goda, K., Ivanian, A., & Atkinson, G. M. (2013). Aftershock statistics of major subduction earthquakes. Bulletin of the Seismological Society of America, 103(6), 3222–3234.
Simanjuntak, A. V. H., & Olymphia, O. (2017). Perbandingan Energi Gempa Bumi Utama dan Susulan (Studi Kasus: Gempa Subduksi Pulau Sumatera dan Jawa). Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 14(1), 19–26.
Syafriani, S. (2018). An investigation of seismicity for the West Sumatra region Indonesia. IOP Conference Series: Materials Science and Engineering, 335(1), 012009.
Syamsi, M. I. (2018). Respon Model Gedung Beton Bertulang dengan Penambahan Dinding Pengisi terhadap Beban Gempa. Semesta Teknika, 21(1), 33–42.
Utsu, T. (1957). Magnitude of earthquakes and occurrence of their aftershocks. Zisin, 10, 6–23.
Utsu, T., & Ogata, Y. (1995). The centenary of the Omori formula for a decay law of aftershock activity. Journal of Physics of the Earth, 43(1), 1–33.
Wulandari, R., Chan, C.-H., & Wibowo, A. (2023). The 2022 Mw6. 2 Pasaman, Indonesia, earthquake sequence and its implication of seismic hazard in central-west Sumatra. Geoscience Letters, 10(1), 25.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2025 Uranus : Jurnal Ilmiah Teknik Elektro, Sains dan Informatika
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
