Site characterization by seismic noise in Istanbul,Turkey |
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| Authors: | Matteo Picozzi Angelo Strollo Stefano Parolai Eser Durukal Oguz Özel Savas Karabulut Jochen Zschau Mustafa Erdik |
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| Institution: | 1. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;2. Institute of Geosciences, Universität Potsdam, Germany;3. Earthquake Engineering Department, Kandilli Observatory and Earthquake Research Institute, Bogaziçi University, 81220 Çengelköy, Istanbul, Turkey;4. I.U. Engineering Faculty, Geophysical Engineering Department, Turkey |
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| Abstract: | Single station seismic noise measurements were carried out at 192 sites in the western part of Istanbul, Turkey. This extensive survey allowed the fundamental resonance frequency of the sedimentary cover to be mapped, and identify areas prone to site amplification. The results are in good agreement with the geological distribution of sedimentary units, indicating a progressive decrease of the fundamental resonance frequencies from the northeastern part, where the bedrock outcrops, towards the southwestern side, where a thickness of some hundreds meters for the sedimentary cover is estimated. The particular distribution of fundamental resonance frequencies indicates that local amplification of the ground motion might play a significative role in explaining the anomalous damage distribution after the 17 August 1999 Kocaeli Earthquake. |
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| Keywords: | Istanbul Seismic noise Array measurements S-wave velocity Resonance frequency |
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