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Local site effects and noise characteristics in Ataköy area, Istanbul, Turkey

Local site effects and noise characteristics in Ataköy area, Istanbul, Turkey. Mathilde Bøttger Sørensen 1 , Sylvette Bonnefoy-Claudet 2 , Kuvvet Atakan 1 , Caglar Yalciner 3

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Local site effects and noise characteristics in Ataköy area, Istanbul, Turkey

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  1. Local site effects and noise characteristics in Ataköy area, Istanbul, Turkey Mathilde Bøttger Sørensen1, Sylvette Bonnefoy-Claudet2, Kuvvet Atakan1, Caglar Yalciner3 1Department of Earth Science, University of Bergen, Norway, mathilde.sorensen@geo.uib.no, 2LGIT, Université Joseph Fourier, Grenoble, France, 3Osmangazi University, Eskisehir, Turkey.

  2. Westward migration of earthquakes on the NAF after Barka et. al. (2002)

  3. Geology of Istanbul Map from Istanbul Metropolitan Municipality web pages, www.ibb.gov.tr

  4. Geology of Istanbul Map from Istanbul Metropolitan Municipality web pages, www.ibb.gov.tr

  5. Ataköy area, geology Ataköy From I.T.Ü. Gelistirme vakfi iktisadi isletmesi

  6. Ataköy area, accessibility

  7. 3 approaches • H/V spectral ratio • Standard spectral ratio • 1D modelling

  8. H/V spectral ratio

  9. Noise recording Site A019

  10. H/V results, Alluvium

  11. H/V results, Bakirköy formation

  12. Standard spectral ratio

  13. Event locations

  14. Results, SSRall events

  15. Event locations

  16. Results, SSRevents 2 + 4

  17. SSR resultscomparison

  18. 1D modeling site Representative of alluvial site: 5 m Alluvium 8 m Bakirköy formation 80 m Güngören formation Bedrock

  19. 1D modeling, sources • Point forces with delta-like source time function at 4 and 8 m depth • Distributed randomly in space, time, direction and amplitude • Green’s functions are calculated using Hisada (1994)

  20. 1D modeling, results

  21. Summary • Agreement between recorded and modelled microtremor H/V results • Peaks at 1Hz and 3-6 Hz for alluvial site • Peak at 1 Hz for Bakirköy formation • SSR indicates high amplification levels, up to a factor of 10

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