Yener EYÜBOĞLU, Nafiz MADEN, Osman BEKTAŞ

Different modes of stress transfer in a strike slip fault zone: an example from the North Anatolian fault system in Turkey

Sağ yönlü Kuzey Anadolu Fay Sistemi (KAFS), Doğu Anadolu'nun sıkışmalı tektonik rejimi ile, Batı Anadolu'nun genişlemeli tektonik rejimi arasÝnda uzanmaktadır. Bu farklı tektonik rejimlerden dolayı Kuzey Anadolu Fay Sistemi, doğuda dar bir deformasyon zonuna, batıda ise yarı paralel faylardan oluşan daha geniş bir deformasyon zonuna sahiptir. KAFS'nin Erzincan-Bolu arasında kalan 'doğu makro sismik zonu' 500 yıllık süreç içerisinde fay zonuna paralel, birbirini takip eden lineer deprem serileri üretmiştir. Bu durum, deprem serilerini oluşturan stres transferinin bütünüyle elastik kabuk içerisindeki fay boyunca Ôstatik Coulomb kırılma stres değişimleri'nin sonucunda meydana geldiğini gösterir. Diğer yandan, Marmara Bölgesinde Kuzey Anadolu Fay Sistemi'nin 'batı makro sismik zonu' ise yarı paralel faylar (KAFS'nin kuzey ve güney kolları) üzerinde birbirini takip eden deprem şiftleri üretmiştir. Bu tür sismik özellik, asismik alt kabuk ve manto içindeki büyük ölçekli akmalar ile, paralel faylar arasındaki 'dinamik stres değişimlerine' işaret eder.

Doğrultu atımlı fay zonlarında farklı stres transferleri: Kuzey Anadolu fayı sisteminden bir örnek, Türkiye

The dextral North Anatolian Fault System (NAFS) extends for well over 1000 km from the compressive tectonic domain of eastern Anatolia into the broad and diverse tectonic domain of the western Anatolian, Marmara and Aegean regions. These different tectonic regimes are characterized by a narrow deformation zone in the east and a much broader deformation zone with multiple sub-parallel fault zones in the west. The spatial and temporal distribution of large historical and modern earthquakes (Mw>5) shows two distinctive macro-seismic zones in the eastern and western parts of the NAFS. The eastern macro-seismic zone, between the towns of Erzincan and Bolu, has produced a successive linear earthquake series parallel to the fault system over the last 500 years, suggesting that stress transfer along the fault occurred in a manner of "Static Coulomb failure stress changes" through the entire elastic crust. In contrast, the western macro-seismic zone of the NAFS, in the Marmara region, has produced successive earthquake pairs on the parallel faults, implying "dynamic stress changes", involving large-scale flow in the aseismic lower crust and the mantle.

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