MICROZONATION OF ADAPAZARI USING MICROTREMORS

Murat Ergenokon Selçuk

(Thesis Supervisor: Mustafa Erdik)

ABSTRACT

Adapazarı, the provincial capital of Sakarya, is a city where strong earthquakes occurred and many buildings were completely destroyed in these earthquakes. It is located at the most hazardous region in Turkey, very close to North Anatolian Fault Line (NAFL) however; this cannot prevent the development of the city particularly as a center of industry.

In this study, microtremor measurements of Adapazarı are used for classification, prediction of H/V ratios and evaluation of predominant periods of the soil. Thus, firstly properties and usages of microtremors are shown and the techniques used in microtremor analysis are studied in the first three chapters.

Furthermore, microtremor data analysis techniques used to obtain H/V ratios are studied by means of Matlab code. Then, site characteristics of Adapazarı such as, location, seismicity, damage recorded in the last earthquake (Kocaeli 1999, Mw = 7.4), geological condition and soil properties are given in the following chapters.

Afterwards, according to the results of data analyses, the fundamental frequencies/periods are found for different zones of Adapazarı. Then different soil formations, which are Akveren and alluvial formations, are clearly distinguished after these data analyses.

Finally, microzonation for soil types, according to the soils' fundamental periods, is obtained as a result of the over 200 measurements conducted at Adapazarı.