Buldan Horstu boyunca ana drenaj bölünmesinin konumu ve göçünün tektonik aktivite ile ilişkisi (GB Türkiye)

Year 2024, Volume: 14 Issue: 4, 970 - 979, 15.12.2024

Savaş Topal

https://doi.org/10.17714/gumusfenbil.1469171

Abstract

Drenaj bölünmesi, tektonik aktiviteye tepki olarak göç eden, bir yükseltinin her iki yamacındaki komşu drenaj alanlarını ayıran dinamik bir özelliktir. İki komşu havza arasındaki asimetrik yükselme, bölünmenin daha yavaş bir yükselme alanından daha hızlı bir yükselme alanına doğru göç etmesine neden olur. Bölünme göçü, drenaj alanı, sediman kaynağı ve nehir akışı deşarjında değişikliklere yol açacağından, yeryüzü şekli gelişimi üzerinde önemli bir etkiye sahip olduğu için son zamanlarda popüler bir konu haline gelmiştir. Çalışma alanı olan Buldan Horstu, normal faylarla sınırlı bir yükselim alanıdır. Horstun KD’sunu Buldan Fayı, GB’sını ise Buharkent Segmenti’ni oluşturan normal faylar sınırlamaktadır. Buharkent Segmenti, Büyük Menderes Grabeni’nin (BMG) doğu ucunda yer alan ve en genç graben dolgularını kesen Holosen faylarından oluşmaktadır. Bu çalışmada Buldan Horstu ana drenaj bölünmesinin mevcut ve gelecekteki hareketini belirlemek amacıyla normalleştirilmiş diklik indeksi (ksn), Gibert metrikleri ve Chi integrali (χ) kullanılmıştır. Gilbert metrikleri ile ilgili hesaplamalarda, ana drenaj bölünmesi 3 segment (D1, D2 ve D3) olarak ve taban yüksekliği 300 m alınarak hesaplanmıştır. Elde edilen veriler D1 ve D2 segmentinin güneye göç edeceğini ve dolayısıyla Buldan Horstu’nun güneyini sınırlayan Buharkent segmentinin bu göçte birincil etken olduğunu ortaya koymaktadır. Sonuç olarak Buldan Horstu’nun güneye göç etmesi bu alandaki fayların deprem açısından gelecekte daha çok risk taşıdığını göstermektedir.

Keywords

Buldan Horstu, Chi integrali (χ), Drenaj Bölünmesi, Gilbert metrikleri, Normalleştirilmiş diklik indeksi (ksn)

Location and migration of the main drainage divide along the Buldan Horst in relation to tectonic activity (SW Türkiye)

Abstract

Drainage divide is a dynamic feature that separates adjacent drainage areas on both slopes of an uplift, migrating in response to tectonic activity. Asymmetric uplift between two neighboring basins causes the divide to migrate from an area of slower uplift to an area of faster uplift. Divide migration has recently become a popular topic as it has a significant impact on landform development, as it will lead to changes in drainage area, sediment source and river flow discharge. The Buldan Horst, the study area, is an uplift area bounded by normal faults. The horst is bounded to the NE by the Buldan Fault and to the SW by the normal faults forming the Buharkent segment. The Buharkent Segment consists of Holocene faults located at the eastern end of the Büyük Menderes Graben (BMG) and cutting the youngest graben fills. In this study, normalized steepness index (ksn), Gibert metrics and Chi integral (χ) were used to determine the current and future movement of the main drainage divide of the Buldan Horst. In the calculations related to Gilbert metrics, the main drainage divide was calculated as 3 segments (D1, D2 and D3) with a base height of 300 m. The obtained data reveal that the D1 and D2 segments will migrate to the south and therefore the the Buharken segment bounding the south of Buldan Horst are the primary factor in this migration. As a result, the southward migration of the Buldan Horst indicates that the faults in this area have a higher risk of earthquakes in the future.

Keywords

Buldan Horstu, Chi integral (χ), Drainage divide, Gilbert metrics, Normalized steepness index (ksn)

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