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Seismic site classification based on H/V spectral ratio from strong ground motion records: the urban areas of Bursa province

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Abstract

It is known that the site classifications are closely related to the damages caused by earthquakes in areas with increased seismic hazard. Additionally, another important parameter utilized to identify the damage is the Peak Ground Acceleration (PGA) value. While measurements and the GMPE are utilized to identify PGA values, site classification is usually conducted by using the Vs30 value. This study aims to identify the site classifications for Bursa province by using a different approach, namely, the H/V spectral ratio method based on the dominant periods. In this regard, 205 records belonging to 82 earthquakes recorded by 41 strong ground motion stations located in Bursa province were utilized. A mean H/V spectral ratio curve was developed for each station based on the Fourier and response spectra of these earthquake records. Generally, double or multiple peaks resulting from the site structure were observed in the H/V curves. Furthermore, for the station locations, the evaluations were conducted in accordance with the site classifications per the dominant period as it is suggested in the literature. The stations were identified as all of the site classifications suggested by (Zhao et al. Bull Seismol Soc Am 96:914–925, 2006), as SC-1, 2, 3 and 5 suggested by (Fukushima et al. J Earthquake Eng 11:712–724, 2007) and as CL I, II, III, IV and VII suggested by (Di Alessandro et al. Bull Seismol Soc Am 102:680–695, 2012). Additionally, various Spectral Acceleration estimations were made with different GMPE equations for scenario earthquakes, and the results were compared with the design spectra suggested by the Turkish Building Earthquake Code (TBEC 2018). As a result of the study, the H/V spectral curves were generated according to both Fourier and response spectra; using a great number of earthquake data, the hazard was assessed by the soil dominant period-based for the first time in Bursa province.

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Data Availability

The earthquake data are available to Turkish Accelerometry Database and Analysis System (AFAD-TADAS) https://tadas.afad.gov.tr/.

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Acknowledgements

The author would like to thank the editor(s) and anonymous reviewer(s) for their constructive comments. The author also thanks to the Republic of Turkey Ministry of Interior Disaster and Emergency Management Authority Presidential of Earthquake Department (AFAD) for providing earthquake data. Faults and Geology are digitized by Geoscience map viewer in the General Directorate of Mineral Research and Exploration (Akbaş et al. 2011; Emre et al. 2013, 2018).

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  1. Department of Geophysical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Kaan Hakan Coban

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KHC: data curation, formal analysis, methodology, software and writing—original draft.

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Coban, K.H. Seismic site classification based on H/V spectral ratio from strong ground motion records: the urban areas of Bursa province. J Seismol 28, 321–344 (2024). https://doi.org/10.1007/s10950-024-10206-7

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