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Comparison of Site H/V Spectral Ratio and Predominant Frequency by Using Microtremor and Earthquake Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 25th European Meeting of Environmental and Engineering Geophysics, Sep 2019, Volume 2019, p.1 - 5
Abstract
The determination of the predominant frequency and H/V ratio is an essential part of dynamic site characteristics. In the present study, we aim to evaluate the site effects of the Marmara region by calculating horizontal-vertical spectral (H/V) ratio and predominant frequency from microtremors and earthquakes data. We selected 5 earthquakes (M ≤ 4.5), which occurred in the Marmara region and recorded by 14 broadband seismometer stations. Also, we determined 1-hour microtremor records according to earthquakes date and time. The H/V ratio and predominant frequency were calculated by Nakamura method with Geopsy program and Seaseme criteria. Besides, the same parameter was estimated from S-waves and Coda waves of selected earthquakes. The results were compared with each other. According to the results, the H/V ratio and predominant frequency values vary according to the direction of earthquakes. In some stations, the microtremors and earthquakes results give close results. However, for reliable H/V ratios and predominant frequency values, we think that earthquake records and microtremors records should be compared. The study results will contribute to the Marmara region seismic risk assessment.