Natural and Technological Hazards and Ecology, Institute of Earthquake Engineering and Engineering Seismology, Ss. Cyril and Methodius University in Skopje , Skopje , North Macedonia
,
Department of Geotechnics, Faculty of Geotechnical Engineering, University of Zagreb , Varaždin , Croatia
Natural and Technological Hazards and Ecology, Institute of Earthquake Engineering and Engineering Seismology, Ss. Cyril and Methodius University in Skopje , Skopje , North Macedonia
,
Department of Civil Engineering, Department of Civil Engineering, University North , Varaždin , Croatia
Natural and Technological Hazards and Ecology, Institute of Earthquake Engineering and Engineering Seismology , Ss. Cyril and Methodius University in Skopje , Skopje , North Macedonia
Natural and Technological Hazards and Ecology, Institute of Earthquake Engineering and Engineering Seismology, Ss. Cyril and Methodius University in Skopje , Skopje , North Macedonia
This study focuses on the site characterization of strong motion stations in North Macedonia using H/V spectral ratio analysis of both microtremor measurements and recorded earthquake data. It presents a methodology for calculating the H/V spectral ratio from earthquake recordings, with results compared to those obtained from microtremor measurements (available for most stations) to assess consistency and reliability. Currently, thirteen strong motion stations are operational across the country, with additional data available from thirteen non-operational stations. Several sites have been previously investigated through geophysical surveys and borehole geotechnical studies, which are also utilized in this study for comparison with the newly conducted H/V analyses. The analysis emphasizes the influence of local site conditions on recorded ground motions and identifies potential site amplification effects. These findings will serve as a basis for defining appropriate frequency ranges in the calculation of the high-frequency decay parameter, kappa (κ), for the territory of North Macedonia. Future work will explore the potential correlation between the fundamental site frequency and the site-specific attenuation component (k₀) of kappa, aiming to improve the understanding of local site effects. These insights could contribute to the refinement of site classification schemes for the next generation of Eurocode 8.
Earthquake Recordings, Horizontal-To-Vertical Spectral Ratio (H/V), Site Effect, Site Response, Strong Motion Stations
The statements, opinions and data contained in the journal are solely those of the individual authors and contributors and not of the publisher and the editor(s). We stay neutral with regard to jurisdictional claims in published maps and institutional affiliations.
