Site amplification and resonance frequency in the urban environment. Issue 105 (February 2018)

• Record Type: Journal Article
• Authors: Dikmen, S. Ümit; Tanırcan, Gülüm
• Is Part Of: Soil dynamics and earthquake engineering. Issue 105(2018)
• Page Start: 160
• Page End: 170
• Publication Date: 2018-02
• Subjects: ATK Ataköy Downhole Array -- BSR Borehole Spectral Ratio -- FTH Fatih Downhole Array -- HVRS Horizontal to Vertical Spectral Ratio -- IMM Istanbul Metropolitan Municipality -- IRRS Istanbul Rapid Response System -- KOERI Kandilli Observatory and Earthquake Research Institute -- NEHRP National Earthquake Hazard Reduction Program -- OSR Outcrop Spectral Ratio -- RSR Response Sprectral Ratio -- SRSS square root of the sum of the squares -- SSR Standart Spectral Ratio -- TUBITAK Scientific and Technological Research Council of Turkey -- ZYT Zeytinburnu Downhole Array; Site amplification -- Resonance frequency -- Downhole arrays -- Outcrop -- Earthquakes -- Built environment; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2017.12.010
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: The effects of the built environment on site amplification and resonance frequency are studied utilizing 34 earthquake recordings made at three seismic downhole arrays (ATK, FTH and ZYT) and two outcrop stations at Istanbul. The earthquake data set included minor to moderate earthquakes having hypocenters at various distances and azimuths with respect to the arrays. The buildings considered in the study are at distances less than 110 m from the arrays and have different dynamic characteristics. The results indicate the impact of the buildings on the site amplification and resonance frequency. At ATK and ZYT arrays, the buildings have a lowering effect on the site amplification, while at FTH array a shift in the resonance frequency is observed. Results from ATK and FTH sites also support previous findings that even in case of similarity between the shear wave velocity profiles amplification levels can differ significantly. Highlights: Buildings nearby effect the amplification ratios and resonance frequencies. Deposits with similar shear wave averages can have different amplification levels. V s30 does not reflect the effects of high impedance contrast interfaces.