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Journal : JOURNAL ONLINE OF PHYSICS

SEISMIC RATE CHANGES ANALYSIS BASED ON THE SPASIAL DISTRIBUTION SEISMOTECTONICS IN THE SOUTHERN SUMATRA REGION Florentina Simalango, Nora; Syafriani, Syafriani; Dwiridal, Letmi; Zulhendra, Zulhendra
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 1 (2024): JOP (Journal Online of Physics) Vol 10 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i1.38137

Abstract

The southern Sumatra region experiences high seismic activity, often resulting in large earthquakes that cause significant losses. Before such earthquakes, a phenomenon known as seismic quiescence a decrease in seismic activity commonly occurs. This phenomenon can be analyzed through changes in seismic rates using the spatial distribution of Z-values. This study investigates the occurrence of seismic quiescence before major earthquakes and examines changes in seismic rates in southern Sumatra. Used secondary earthquake data from the United States Geological Survey (USGS) for 1973–2023 were analyzed, focusing on the region between 2.050°S–5.885°S and 101.030°E–106.611°E. The study centered on three significant earthquakes: the 2000 (7.9 Mw), 2001 (7.4 Mw), and 2007 (8.4 Mw) events.  Seismic rate changes were analyzed using the Z-value method, dividing the region into grids to calculate and spatially distribute Z-values. Results showed seismic quiescence before the 2000 (±16 years), 2001 (±13 years), and 2007 (±17 years) earthquakes in Bengkulu. Additionally, similar phenomena were observed in Bengkulu and Lampung before 2023, suggesting the potential for future significant earthquakes in the region. These findings highlight seismic quiescence as a precursor to major seismic events.
Co-Authors Adzura, Nadilla Afiah Afiah Afrinis, Nur Agustina, Mia Dwi Alini, Alini Althaf, Muhammad Mahdy Alwa, MaqhviraHusna Amelia Wulandari Ananda, Lusi Septia Andi Irfan, Andi Anggraini Dhilon, Dhini Angraini, Dela Nofri Aprilla, Nia Ari Setiawan Arifianto, Nasruhan Astuti - Astuti, Haryati Astuti, Retnaning Ayu, Febri Azilah, Fatimah Nur Azmi, Zul Cahyani, Yuyun Febri Cuyno Mellen, Renie Darma, Wiga Aulia Darwis, Nurizah Binti Mohamed Daya, Ellen Kurniawati Defita, Ermi Dessyka Febria, Dessyka Deswari, Dini Eka Saputri, Eka Eka Setiawati Elizha, Zellvia Erlinawati Erlinawati, Erlinawati Faizah, Ni’ma Tri Fauzi Ahmad Muda Fauzi, Muhammad Aulia Fayzal, Muhammad Febriwanti, Mutiara Kusuma Felayati, Felayati Fitri Aulia Fitri S, Rahmi Pramulia Florentina Simalango, Nora Gunarmi Gunarmi, Gunarmi Hamdi , Hamdi Hamdi Hamdi HAMIDI, M. NIZAR SYARIF Handayani, Riska Hardianti, Evi Harman Amir Husna, Azmi Asmaul Irinericy , Rani Isnaeni, Lira Mufti Azzahri khofi, Mohammad Bilutfikal Kusuma, Novy Oktaviandri Kusumawati, Nila Lasepa, Wanda Laxmi, Laxmi Leatari, Rizki Rahmawati Letmi Dwiridal Linda Susanti Linda Widyaningsih Lingga, Leny Julia lsmalinda, lsmalinda Mardhatillah, Dela Mesi, Mesi Miftahurrahmi, Miftahurrahmi Mubasysyir Hasanbasri Muhammad Nizar Nabilla, Agma Navelia, Zesika Intan Ningsih, Andi Pramesti Noorhayati, Ariyana Nur Azizah Nur Faizah, Ida Oktaviani, Yoneta Parasandy , Ardila Parmin, Joria Percindira, Ella Dwi Prasetya, Danny Chandra Puji Hastuti Purnamasari, Yulia Puteri, Ade Dita Putri, Minazri Eka Putri, Nadya Annisa Putri, Yura Chaniago Ramadhan, Syahwira Ramli Ramli Rejeki, Yunaji Sri Rizki Rahmawati Lestari Rizqi, Eka Roshifita S, Ayu Purnamasari Saibatul Aslamiah, Saibatul Sari, Rika Rosvita Setiawan, Dicko Silitonga, Yese Angga Marito Siti Aisyah Siti Nurhayati Siwi Padmawati, Retna Sofiana Sofiana, Sofiana Sri Hardianti Sri Widiyati, Sri Sumangkut, Aprilia Meymey Suparmin Suparmin Syamsul Bachry SYARIFA SYARIFA, SYARIFA Syarifah Aini Syarifah, Zulfa Lailatus Syukrianti Syahda Taruna, Jhon Utari, Yola Vera Diane Tombokan Viora, Dwi Wahyu Ramadhan WIJOYO, HADION Williani, Shelly Yanri Wijayanti Subronto Yendri Sudiar, Nofi Yuliska, Rumi Yusrila, Yoga Z.R, Zurahmi Zulhendra, Harman Amir Zulhendra, Zulhendra