Inspectation of the shear wave velocity (Vs) change by the soil properties and determination of the natural period (To) of the soil in the Eskişehir urban area

ABSTRACT Master of Science Thesis INSPECTATION OF THE SHEAR WAVE VELOCITY (Vs) CHANGE BY THE SOIL PROPARTIES AND DETERMINATION OF THE NATURAL PERIOD (T0) OF THE SOIL IN THE ESKİŞEHİR URBAN AREA MUAMMER TÜN Anadolu University Graduate School of Natural and Applied Sciences Physics Program Supervisor: Prof.Dr.Can AYDAY 2003, 114 page The urban area of Eskişehir is under the influence of earthquake phenomena due to the poor soil properties and uncontrolled building construction. The aim of this master thesis was to find out the relationship between shear wave velocity (Vs) and soil conditions with the effect of earthquake facts. Totally 32 different points were selected and Seismic Conic Penetration Tests (SCPT) were applied in these locations. The values like qc, Rf and Vs were obtained during the SCPT tests. Soil types according to Robertson (1986) were determined by using these values. Statistical evaluation of all the obtained data which can be used as soil property indicator was done. All the frequency histograms of these data were analysed. The relation between shear wave velocity (Vs) which was obtained from SCPT and the reorganized qc and Rf values from CPT tests were investigated. The Vs values obtained from the relation were used for the susceptibility of the studied area deposit to ground motion amplification according to the National Earthquake Hazard Reduction Program (NEHRP). The natural period (T0) of the studied area alluvium deposits were calculated. In the end, the all obtained data were interpreted by using geographic information system (GIS) techniques. After the interpretation it is concluded that, five and six floor buildings which are located on the alluvium along the Porsuk River will have possible phonomenon of critical resonance during probably earthquake. It is proposed, these precautions must be applied during the new urban planning stage. Key words: Geographic information system (GIS), Natural period of soil (T0), Shear wave velocity (Vs), National Earthquake Hazard Reduction Program (NEHRP), Seismic Conic Penetration Test (SCPT). 11