Local site effects in Istanbul: Microtremor study in Ataköy area Mathilde Bøttger Sørensen 1 Caglar Yalciner 2 and Kuvvet Atakan 1 1 Department of Earth.

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Presentation transcript:

Local site effects in Istanbul: Microtremor study in Ataköy area Mathilde Bøttger Sørensen 1 Caglar Yalciner 2 and Kuvvet Atakan 1 1 Department of Earth Science, University of Bergen, Norway 2 Osman Gazi University, Eskisehir, Turkey

Why are we interested in local site effects in Istanbul? Important factor for actual ground motion caused by an earthquake Necessary in order to move ground motion simulation results from bedrock level to surface of Earth

What did we do: Measured microtremors in the Ataköy area Calculated H/V spectral ratios to obtain information about frequencies with high amplification This information will later be combined with geotechnical data as input in 3D finite- difference modelling in cooperation with ETHZ

Geology of Istanbul From (Geological map by the Istanbul Greater City Council Directorate of Soil and Seismic Studies)

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

Ataköy area, accessibility

Data acquisition GBV-316 and pocket PC 3 x 10 min recorded at each site Sites in grid with m grid spcaing Sites on all formations Collected a total of 30 sites

Microtremor sites, ground coupling

Microtremor sites

Data processing H/V spectral ratios calculated using JSesame software (SESAME project) Automatic window selection by searching traces for windows with low noise level using STA/LTA H/V is calculated for each window or as average for site

JSesame, browsing module

JSesame, window selection

JSesame, H/V parameters

JSesame, display module

JSesame, single window display

Results, Bakirköy Formation

Results, Alluvium

Results, Güngören Formation

Results, Artificial fill

Artificial fill

Main results at the moment Main peak at Hz, in agreement with ITU results Secondary peak at 4-6 Hz at some sites Peaks at higher frequencies are probably caused by noise

Secondary peak

Other available data Borehole data (Japan International Cooperation Agency/Istanbul Metropolitan Municipality) Earthquake data (Kandilli observatory, Bogazaci University) Geomorphological map (Istanbul Technical University) Geological map (Istanbul Technical University) Hydrogeological map (Istanbul Technical University) Well logs (Istanbul Technical University) Resistivity data (Istanbul Technical University)

Future plans Process and interpret data... Check against 1D model Produce input model for 3D finite difference model by combining with other data Run 3D finite difference model and interpret result Use ground motion simulation results as input in 3D model to obtain ground motion at surface