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  1. 防災科研関係論文

Local site effects in Atakoy, Istanbul, Turkey, due to a future large earthquake in the Marmara Sea

https://nied-repo.bosai.go.jp/records/2964
https://nied-repo.bosai.go.jp/records/2964
30b78300-8ec7-41e8-97ce-f93fd77ffdf6
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Local site effects in Atakoy, Istanbul, Turkey, due to a future large earthquake in the Marmara Sea
タイトル
言語 en
タイトル Local site effects in Atakoy, Istanbul, Turkey, due to a future large earthquake in the Marmara Sea
言語
言語 eng
著者 Mathilde B. Sorensen

× Mathilde B. Sorensen

ja Mathilde B. Sorensen

en Mathilde B. Sorensen

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Ivo Oprsal

× Ivo Oprsal

ja Ivo Oprsal

en Ivo Oprsal

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Sylvette Bonnefoy-Claudet

× Sylvette Bonnefoy-Claudet

ja Sylvette Bonnefoy-Claudet

en Sylvette Bonnefoy-Claudet

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Kuvvet Atakan

× Kuvvet Atakan

ja Kuvvet Atakan

en Kuvvet Atakan

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P. Martin Mai

× P. Martin Mai

ja P. Martin Mai

en P. Martin Mai

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Nelson Pulido

× Nelson Pulido

ja Nelson Pulido

en Nelson Pulido

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Caglar Yalciner

× Caglar Yalciner

ja Caglar Yalciner

en Caglar Yalciner

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抄録
内容記述タイプ Other
内容記述 Since the 1999 Izmit and Duzce earthquakes in northwest Turkey, many seismic hazard studies have focused on the city of Istanbul. An important issue in this respect is local site effects: strong amplifications are expected at a number of locations due to the local geological conditions. In this study we estimate the local site effects in the Atakoy area (southwestern Istanbul) by applying several techniques using synthetic data (hybrid 3-D modelling and 1-D modelling) and comparing to empirical data. We apply a hybrid 3-D finite-difference method that combines a complex source and wave propagation for a regional 1-D velocity model with site effects calculated for a local 3-D velocity structure. The local velocity model is built from geological, geotechnical and geomorphological data. The results indicate that strongest spectral amplifications (SA) in the Atakoy area occur around 1 Hz and that amplification levels are largest for alluvial sites where SA reaching a factor of 1.5-2 can be expected in the case of a large earthquake. We also compare our results to H/V (horizontal to vertical component of the recorded signal) spectral ratios calculated for microtremor data recorded at 30 sites as well as to ambient noise synthetics simulated using a 1-D approach. Because the applied methods complement each other, they provide comprehensive and reliable information about the local site effects in Atakoy. Added to that, our results have significant implications for the southwestern parts of Istanbul built on similar geological formations, for which, therefore, similar SA levels are expected. c 2006 The Authors Journal compilation c 2006 RAS.
言語 en
書誌情報 ja : Geophysical Journal International
en : Geophysical Journal International

巻 167, 号 3, p. 1413-1424, 発行日 2006-12
出版者
言語 en
出版者 Oxford University Press (OUP)
ISSN
収録物識別子タイプ EISSN
収録物識別子 1365-246X
DOI
関連識別子 10.1111/j.1365-246X.2006.03204.x
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