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Site Characterization and Site Amplification for a Seismic Microzonation Study in Turkey

Abstract:

The pilot areas were divided into cells by a grid system of 500 m x 500 m for estimating the effects of site conditions at a scale of 1:5000 by assigning representative soil profiles at the centre of each grid. These soil profiles were classified according to the Turkish Earthquake Code, NEHRP site classification, equivalent shear wave velocity and used for site response analyses. The zonation maps involve the division of the area into three zones as (A, B, and C). In all cases, the variations of the calculated parameters are considered separately and their frequency distributions were determined. Thus the zone A shows the most unsuitable 33 percentile, zone B the medium 34 percentile and zone C shows the most favorable 33 percentile. A suitable pa-rameter is considered to be the average spectral acceleration between 0.5-1.5 sec periods obtained from site response analysis. Even though more empirical, the spectral amplifi-cations calculated using equivalent shear wave velocities gave consistent values that appear to be realistic when compared with the selected soil profiles. Thus microzonation maps with respect to ground shaking were based on the average of spectral accelerations and spectral amplifications obtained from equivalent shear wave velocities.

Authors:

Ansal, Atilla and Laue, Jan and Buchheister, Juliane and Erdik, Mustafa and Springman, Sarah M. and Studer, J. and Köksal, Dincer

Index Terms:

site characterisation; microzonation; soil amplification; site response analysis; Soil; SoilGroup; turkey

Further Information:

Date published: 2004