Active Tectonics of Gülbahçe Fault Zone (GBFZ) by Using Geomorphic Indices, İzmir Province, Western Anatolia, Turkey

Year 2021, , 1195 - 1209, 31.10.2021

Berna Geçkin , Hasan Sözbilir , Çağlar Özkaymak , Mustafa Softa

https://doi.org/10.35414/akufemubid.946298

Abstract

The Gülbahçe Fault Zone is a dextral strike-slip fault that extends for ~24 km on land and ~46 km under the sea, which consists of the significant southernmost active segments of İzmir Balıkesir Transfer Zone. In this study, the active tectonic behaviour of the Gulbahçe Fault Zone was evaluated by using of morphometric analysis of geomorphic indices. 30 sub-basins identified using ArcGIS ®10.5 (ESRI). All sub-basins were calculated by using mountain-front sinuosity (Smf), valley-floor width to valley height ratio (Vf), basin asymmetry factor (Af), basin shape indice (Bs), drainage density (Dd), and hypsometric integral (Hi) values. The obtained mean results of values are to define each sub-basin's relative tectonic activity (Iat). The Smf, Vf, Af, Bs, Dd, and Hi values range from 1.05 to 1.33; from 0.21 to 4.09; from 25 to 77; from 1.03 and 3.06; from 0.28 to 0.67, respectively. All the results were gathered under three classes, which sign high tectonics activity (Class 1), moderately active tectonic (Class 2), and low tectonics activity (Class 3). The results show that relative active tectonics indice value (Iat) was obtained between 1.33 and 2.33, indicating very high to moderately tectonic activity.

Keywords

Gülbahçe fault zone, Geomorphic indices, Morphometric analysis, Relative active tectonics indices, Geographic Information Systems, Western Anatolia

Supporting Institution

TUBITAK (The Scientific and Technological Research Council of Turkey

Project Number

117Y190

Thanks

Pınar Gırca from The University of Southern Queensland

Jeomorfik İndis kullanarak Gülbahçe Fay Zonu’ nun (GBFZ) Aktif Tektonik Değerlendirmesi, İzmir, Batı Anadolu, Türkiye

Abstract

Karadaki uzunluğu ~24 km denizdeki uzunluğu ~46 km olan ve sağ yanal ötelenmeli doğrultu atımlı fay karakterindeki Gülbahçe Fay Zonu, İzmir-Balıkesir Transfer Zonu’ nun güney kısmında yer alan en önemli faylarından biridir. Gülbahçe Fay Zonu’nun aktif tektonik davranışını değerlendirmek için drenaj havzaları ve dağ önlerindeki jeomorfolojik indislerin morfometrik analizleri gerçekleştirilmiştir. ArcGIS ®10.5 (ESRI) kullanılarak belirlenen 30 alt havzanın, dağ önü sinüslük indisi (Smf), vadi tabanı genişliği vadi yüksekliği oranı (Vf), havza asimetri faktörü (Af), havza şekil indisi (Bs), drenaj yoğunluğu (Dd) ve hipsometrik integral (Hi) değerleri belirlenmiş ve bu değerlerin ortalamaları alınarak her bir alt havzanın göreceli tektonik aktivitesi (Iat) tanımlanmıştır. Smf değeri 1,05 ile 1,33, Vf değeri 0,21 ile 4,09, Af değerlerinin 25 ile 77; Bs değerlerinin 1,03 ile 3,06 , Dd değerlerinin 0,84 ile 3,49 ve Hi değerlerinin 0,28 ile 0,67 aralığında olduğu belirlenmiştir. Tüm veriler, yüksek tektonik aktivite (Sınıf 1), orta derecede aktif tektonik (Sınıf 2) ve düşük tektonik aktivite (Sınıf 3) olmak üzere üç sınıfta ayrılarak incelenmiştir. Elde edilen sonuçlar, Gülbahçe Fay Zonu’ nun göreceli aktif tektonik indis değerinin (Iat) sırasıyla çok yüksek ile orta derecede tektonik aktiviteyi gösteren 1,33 ile 2,33 aralığında olduğunu gösterir.

Keywords

Gülbahçe fay zonu, Jeomorfik indisler, Morfometrik analiz, Göreceli aktif tektonik indisler, Coğrafi Bilgi Sistemleri, Batı Anadolu

Project Number

117Y190

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