6 Şubat 2023 Kahramanmaraş Pazarcık (Mw: 7,7) depremi ışığında Doğu Anadolu Fay Zonu Erkenek Segmentinin Kinematik Analizi / The Kinematics of Active Crustal Deformation in the Erkenek Segment of the Eastern Anatolian Fault Zone Using Comprehensive Surface Rupture Analysis from the February 6, 2023 Earthquake (Mw 7.7)

Öz

Anadolu’nun Neotektonik dönemi yapılarından biri olan Doğu Anadolu Fay Zonu (DAFZ) kıta içi deformasyonu sağlayan sol yanal doğrultu atımlı aktif bir fay zonudur. DAFZ; kuzey kol ve ana kol olarak da adlandırılan güney kol olmak üzere iki bölümden oluşmaktadır. Bu çalışmanın konusunu DAFZ’nin güney kolu üzerinde meydana gelen 6 Şubat 2023 Pazarcık depreminde (Mw: 7,7), Erkenek Segmenti üzerinde gelişen yüzey kırığının Çelikhan (Adıyaman) yakınlarındaki bölümü üzerinde gerçekleştirilen detaylı jeolojik, paleosismolojik ve haritalama çalışmalarının ön bulguları oluşturmaktadır. Yapılan çalışmalarda yüzey kırığı Çelikhan kesiminde 50 cm düşey atımın eşlik ettiği maksimum sol yanal yer değiştirme miktarı 3,25 m olarak ölçülmüştür. Çelikhan’ın kuzeydoğusuna doğru gidildikçe sol yanal yer değiştirme miktarının azaldığı ve sönümlendiği görülmüştür. Erkenek segmenti boyunca fay düzlemlerinden ölçülen kayma verilerinin kinematik analizi sonucunda, segmentin geometrisi ile uyumlu deformasyonun yaklaşık KD-GB ve KKB-GGD doğrultulu sıkışma gerilmesiyle ilişkili doğrultu atımlı tektonik rejim altında geliştiği saptanmıştır.

Anahtar Kelimeler

• Doğu Anadolu Fay Zonu
• Erkenek Segmenti
• Yüzey Kırığı
• paleosismoloji
• paleostres

The Kinematics of Active Crustal Deformation in the Erkenek Segment of the Eastern Anatolian Fault Zone Using Comprehensive Surface Rupture Analysis from the February 6, 2023 Earthquake (Mw 7.7)

Öz

The Eastern Anatolian Fault Zone (EAFZ) is a significant neotectonic feature in Anatolia, characterized as an active intra-continental left-lateral strike-slip fault. The EAFZ comprises two distinct parts: the southern branch, referred to as the main branch, and the northern branch. This study examines the surface rupture near Çelikhan (Adıyaman) on the Erkenek Segment, which developed during the February 6, 2023 Pazarcık earthquake (Mw 7.7), occurring along the southern branch of the EAFZ. The primary emphasis of this study centers on preliminary findings derived from thorough geological investigations conducted on the surface fault rupture. Additionally, novel insights into seismic activity associated with the Erkenek Segment were revealed for the first time through meticulous field studies. In the studies, the maximum left-lateral displacement measured in the Çelikhan section of the surface fracture was 3.25 meters, accompanied by a vertical slip of 50 centimeters. The magnitude of left-lateral displacement decreased and attenuated moving northeastward from Çelikhan. Based on kinematic analysis of slip data obtained from fault planes along the Erkenek segment, the deformation aligned with the segment's geometry and occurred within a strike-slip tectonic regime influenced by compressional stress predominantly oriented in NE-SW and NNW-SSE directions.

Anahtar Kelimeler

• East Anatolian Fault Zone
• Erkenek segment
• Surface rupture
• paleoseismology
• paleostress

Kaynakça

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