VS30, site amplifications and some comparisons: The Adapazari (Turkey) case |
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| Institution: | 1. RISKNAT Group, GEOMODELS, Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, c/Martí i Franquès, s/n, 08028 Barcelona, Spain;2. Barcelona Center for Subsurface Imaging (B-CSI), Departament de Geociències Marines - Institut de Ciències del Mar - CSIC, 08003 Barcelona, Spain;3. Institut de Radioprotection et Sûreté Nucléaire - Seismic Hazard Division (BERSSIN), BP 17, 92262 Fontenay-aux-Roses, France;4. Área de Geodinámica Externa, Facultad de CC. Ambientales, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain;5. Departamento de Geodinamica, Universidad Complutense, Instituto de Geociencias IGEO (UCM, CSIC), 28040 Madrid, Spain;6. Department of Geological Sciences, San Diego State University, San Diego, CA 92182, USA;7. Berkeley Geochronology Center, Berkeley, CA 94709, USA;8. Landscape Dynamics, Department of Geography, University of Sheffield, Sheffield S10 2TN, UK |
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| Abstract: | The aim of this study was to investigate the role of VS30 in site amplifications in the Adapazari region, Turkey. To fulfil this aim, amplifications from VS30 measurements were compared with earthquake data for different soil types in the seismic design codes. The Adapazari area was selected as the study area, and shear-wave velocity distribution was obtained by the multichannel analysis of surface waves (MASWs) method at 100 sites for the top 50 m of soil. Aftershock data following the Mw 7.4 Izmit earthquake of 17 August 1999 gave magnitudes between 4.0 and 5.6 at six stations installed in and around the Adapazari Basin, at Babal?, ?eker, Genç, Hastane, Toyota and Imar. This data was used to estimate site amplifications by the reference-station method. In addition, the fundamental periods of the station sites were estimated by the single station method. Site classifications based on VS30 in the seismic design codes were compared with the fundamental periods and amplification values. It was found that site amplifications (from earthquake data) and relevant spectra (from VS30) are not in good agreement for soils in Adapazari (Turkey). |
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| Keywords: | Site effects Seismic design codes Adapazari |
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