INVESTIGASI KARAKTERISTIK TANAH MENGGUNAKAN METODE HORIZONTAL TO VERTICAL SPECTRAL RATIO PADA STUDI KASUS KAWASAN INSTITUT TEKNOLOGI SUMATERA
DOI:
https://doi.org/10.53625/jirk.v5i4.11325Keywords:
HVSR, Karakteristik Tanah, Mikrotremor, ITERAAbstract
Institut Teknologi Sumatera (ITERA), located in South Lampung Regency, near to the Sunda subduction zone, which has earthquake hazard potential. This study investigates soil characteristics in the ITERA area using the Horizontal to Vertical Spectral Ratio (HVSR) method, based on 2023 microtremor data from 30 measurement points. Analysis focused on dominant frequency (f0), amplification factor (A0), and seismic vulnerability index (Kg) to evaluate subsurface variations and earthquake-induced damage potential. Results show dominant frequencies ranging from 0.52 to 17 Hz. The northwest and central zones, with values below 2 Hz, suggest thick and soft tuff sediments, whereas higher values of 7-17 Hz in the northeast and southeast indicate thinner, compact soil. Amplification factors vary between 1 and 7, with lower values in the central–northern zones and higher ones in the south. The seismic vulnerability index ranges from 0.2 to 40, with the southwest and southern areas exhibiting the highest values (20-40). These findings refine previous studies by offering better spatial resolution and highlight critical areas for earthquake risk mitigation and infrastructure planning
References
H. A. , Haridhi, B.-S. Huang, K.-L. Wen, D. Denzema, R. A. Prasetyo, and C.-S. Lee, “A study of large earthquake sequences in the Sumatra subduction zone and its possible implications,” Terr. Atmos. Ocean. Sci, vol. 29, pp. 635–652, 2018.
Elin, “Ketua MPR Dorong Percepatan Pembangunan Kampus Itera,” https://www.itera.ac.id/ketua-mpr-dorong-percepatan-pembangunan-kampus-itera/.
Y. Nakamura, “A Method for Dynamic Characteristics Estimation of Subsurface using Microtremor on the Ground Surface,” Quarterly Report of Railway Technical Research Institute (RTRI), vol. 30, no. 1, 1989.
P.-Y. Bard, Microtremor measurements: A tool for site effect estimation?, vol. 3. 1998.
M. R. P. Sudibyo, E. I. Fattah, C. Suhendi, and R. Rizki, “Horizontal-to-vertical spectral ratio of ambient noise vibrations for local site effects estimation in ITERA,” in IOP Conference Series: Earth and Environmental Science, Institute of Physics Publishing, May 2019. doi: 10.1088/1755-1315/258/1/012041.
ITERA, Rencana Strategis ITERA 2019-2024. Lampung Selatan: ITERA, 2019.
H. Phan, P. Guéguen, and P. Y. Bard, “Building–site interaction and its implications for urban seismic risk,” Res Sq, 2025.
Y. Nakamura, “Clear identification of fundamental idea of Nakamura’s technique and its applications,” Proceedings of the XII World Conference Earthquake Engineering, vol. Paper no 2656, Jan. 2000.
S. Molnar et al., “A review of the microtremor horizontal-to-vertical spectral ratio (MHVSR) method,” J Seismol, vol. 26, no. 4, pp. 653–685, 2022, doi: 10.1007/s10950-021-10062-9.
SESAME, Guidelines for the Implementation of the H/V Spectral Ratio Technique on Ambient Vibrations: Measurements, Processing and Interpretation . SESAME European Research Project WP12, 2004.
F. Grajales-Saavedra et al., “Horizontal-to-Vertical Spectral Ratios and Refraction Microtremor Analyses for Seismic Site Effects and Soil Classification in the City of David, Western Panama,” Geosciences (Switzerland), vol. 13, no. 10, Oct. 2023, doi: 10.3390/geosciences13100287.
M. Neukirch, A. García-Jerez, A. Villaseñor, F. Luzón, M. Ruiz, and L. Molina, “Horizontal-to-vertical spectral ratio of ambient vibration obtained with hilbert–huang transform,” Sensors, vol. 21, no. 9, May 2021, doi: 10.3390/s21093292.
Y. Nakamura, “ON THE H/V SPECTRUM.”
N. Sitorus, S. Purwanto, and W. Utama, “Analisis Nilai Frekuensi … ANALISIS NILAI FREKUENSI NATURAL DAN AMPLIFIKASI DESA OLAK ALEN BLITAR MENGGUNAKAN METODE MIKROTREMOR HVSR.”
Y. Nakamura, “What is the Nakamura method?,” Jul. 01, 2019, Seismological Society of America. doi: 10.1785/0220180376.
