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Rizqi Prastowo
Institut Teknologi Nasional Yogyakarta
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Journal : journal of science and applicative technology

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Effect of Azimuthal Variability in Estimation of HVSR Parameters and Ground Shear Strain at Kota Baru, South Lampung, Indonesia Ipmawan, Vico Luthfi; Prastowo, Rizqi; Iqbal, Mochamad; Permanasari, Ikah Ning Prasetiowati; Herman, Sofiana
Journal of Science and Applicative Technology Vol. 9 No. 1 (2025): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i1.2107

Abstract

Kota Baru, a potential capital of Lampung Province in South Lampung, Indonesia, faces significant earthquake risks due to the Great Sumatran Fault and the Sumatra Megathrust. Geologically, the area is part of the Plio-Pleistocene Lampung Formation, predominantly composed of rhyolite-dacite tuff and volcanoclastic tuff, which can amplify seismic shaking. This study investigates azimuthal variations in the Horizontal-to-Vertical Spectral Ratio (HVSR) across 15 locations in Kota Baru to identify their underlying causes. The results show notable changes in peak amplitude (Ao) and dominant frequency (fo) across different azimuths, with Mean Absolute Deviations (MAD) ranging from 0.96 to 5.71 for Ao and from 0.00 to 1.57 for fo. Maximum HVSR values were predominantly observed at azimuths below 30° across most regions. These variations are likely related to differences in soft layer thickness and/or the presence of a suspected fault near the study area, both of which could influence seismic wave propagation. A model of an 8.9-magnitude megathrust earthquake revealed no significant differences in Ground Shear Strain values, with results remaining within the same Modified Mercalli Intensity (MMI) scale. Therefore, despite azimuthal variability, the assumption of isotropic ambient noise in Kota Baru remains valid.
Co-Authors A.A Inung Arie Adnyano A.A. Inung Arie Adnyano Abdul Latif Ashadi Agustinus Isjudarto Ahmad Said Akhmad Zamroni Al Hussein Flowers Rizqi Aldri, Riaferdo Amir Machmud Amir Machmud, Amir Andika Eko Prasetiyo Andika Eko Prasetiyo, Andika Eko Andy Erwin Wijaya Andyono B. Santoso Angger Bagus Prasetiyo Anggi Hermawan Anita Susiana Bagus Gilang Pratama, Bagus Gilang Basak Ozyurt Berwyn Dzaky Radhitya Berwyn Dzaky Radhitya Dandi Pranomo Dyah Arum Arimurti Eko Wahyu Hidayat, Eko Wahyu Excellentia Riane Kapugu Fahrul Nurfajri Mokoagow Fajar Yulianto Prabowo Fajri Farid Filipus Alfriyadi Junaidi firhad firmansyah Hasan Said Tortop Hendro Purnomo Herman, Sofiana Hidayatullah Shidiq hidayatullah sidiq Hurien Helmi Ichwan Noor Ardiyat Ikah N. P. Permanasari Ilham Mopio Iman Pradana A. Assagaf Iqbal, Mochamad Iwan Tri Riyadi Yanto Jemssy Ronald Rohi Jermsittiparsert, Kittisak Junior, Prince Robert Keodouangdy Yongthong Kittisak Jermsittiparsert Korhan Cengiz Manmeet Kaur Melfa Utari Muhamad Syazali Muhammad Hafizh Hibullah Muhammad Nauval Bahy Nameeta Brahme Nanda Juli Setiawan Novandri Kusuma Wardana Oggi Heical Ardian Oggi Heicqal Ardian Oky Sugarbo Oky Sugarbo Paramitha Tedja Trisnaning Partama Misdiyanta Puspasari, Fitri Rahmad Junaidi, Rahmad Randy Galaxy Rita Desiasni Rizal Maulana Rizal Maulana, Rizal Rofiqul Umam Sabrina Putri Puspitasari Sely Novita Sari Setyo Pambudi Setyo Pambudi Shilvyanora Aprilia Rande, Shilvyanora Syamsul Huda Syamsul Huda Syouma Hikmahtiar Tarumasely, Nofry Hence Tedy Kurniawan Tortop, Hasan Said Tri Nugroho Suwarno Tuna Topac Urip Nurwijayanto Prabowo Urip Nurwijayanto Prabowo Urip Nurwijayanto Prabowo, Urip Nurwijayanto Veronica Diana Anis Anggorowati Vico Luthfi Ipmawan Vishal R. Panse Yogesh Murkute Yonathan Ito Yoshitaka Mitsui