BAŞKALE FAY ZONU’NUN TEKTONİK JEOMORFOLOJİSİ

Başkale Fay Zonu (BFZ) Türkiye’nin güneydoğusunda, Şemdinli-Yükseova Fay zonu ile İran’ın kuzeybatısında bulunan Guilato–Siahcheshmeh–Khoy Fay sisteminin arasında yer almaktadır. Kuzeydoğuda Yavuzlar beldesinden başlayıp, güneybatıda Işıklar köyüne kadar devam etmektedir. Yaklaşık olarak K10°D ile K40°D arasında değişen doğrultulara sahip olan BFZ Işıklı, Ziraniş ve Çamlık faylarından meydana gelmektedir. Ötelenmiş dere yatakları, fay denetimli akaçlama sistemi (Çığılsuyu Irmağı gibi), faylar boyunca uzanan ve deformasyon geçirmiş alüvyon yelpazeleri, fay düzlükleri, Pliyo-Kuvaterner yaşlı volkanitler ve volkanik yapılar, oluşumunu günümüzde de sürdüren çatlak sırtı travertenler BFZ’nun aktif olduğunu gösteren morfotektonik özelliklerdir. Bu çalışmada bölgenin morfotektonik evriminde Başkale Fay Zonu’nun etkisinin belirlenmesi amaçlanmıştır. Bu amaç içerisinde, morfotektonik analizler için çalışma alanının Sayısal Yükseklik Modeli üzerinde hipsometrik integral, drenaj havzası asimetrisi, vadi tabanı genişliğinin-vadi yüksekliğine oranı ve dağ cephesi kıvrımlılığı gibi morfometrik indisler üretilerek yorumlanmıştır. Morfometrik analiz sonuçlarına bağlı olarak, alanın son derece genç bir topoğrafyaya sahip olduğu ve aktif olarak yükseldiği görülmektedir. Bölgedeki yükselme hızının doğudan batıya doğru arttığı ve batı kesimlerinde yılda 0.5 mm’den fazla olduğu sonucuna varılmıştır

Earthquakes, liquefaction, peak ground acceleration, Van (Turkey).

The Erciş-Van earthquake with magnitude Mw:7.2 that struck at 13:41 local time on Sunday, October 23,2011 in northern part of Van province affected an area ofabout 13.500 square kilometer at the Eastern Turkey.After several days from the Erciş- Van earthquake,another quake with magnitude Mw: 5.6 occurred onNovember 9, 2011 at am 21:23 local time in southwest ofthe city centre of Van province. Thousands of aftershocks,many in the magnitude 4.0 to 5.0 range, occurred duringthe next few months. This investigation describes theeffects of the aforementioned earthquakes on structuraldamage. In the first part, ground motion parameters andground deformations during earthquakes were presented.The second part deals with the local site conditions ofaffected settlement areas. In the last part, the attention isfocused on the effect of soil conditions on structuraldamage

Geology of the Çaldıran Fault, Eastern Turkey: Age, slip rate and implications on the characteristic slip behaviour

International audienc

Tectonic geomorphology of Bozdoğan and Karacasu grabens, western Anatolia

Western Anatolia is one of the most rapidly extending and seismically active regions in the world. The circa N-S extension since the Early Miocene caused the formation of E-W trending major grabens and intervening horsts, having earthquake potentials with magnitude ≥5. The E-W oriented Büyük Menderes graben cross-cuts the broadly N-S oriented Bozdoğan and Karacasu grabens, of which the boundary faults of the latter are the source of seismic activity. Geomorphic indices, including drainage basin asymmetry, mountain front sinuosity, valley-floor width to valley height ratio, stream length-gradient index and normalized channel steepness index, were used to evaluate the boundary fault segments of the Bozdoğan and Karacasu grabens. The results indicate that both grabens are tectonically active and therefore regions of earthquake potential, consistent with the epicenters of earthquakes. Thus, it can be inferred that fault segments of second-order grabens, which are crosscut by the boundary faults of seismically active main depressions, are apparently reactivated by ongoing tectonism and may represent seismic activity. This suggestion applies also for similar basins located in the western Anatolia

Tectonic geomorphology of Bozdoğan and Karacasu grabens, western Anatolia

Western Anatolia is one of the most rapidly extending and seismically active regions in the world. The circa N-S extension since the Early Miocene caused the formation of E-W trending major grabens and intervening horsts, having earthquake potentials with magnitude ≥5. The E-W oriented Büyük Menderes graben cross-cuts the broadly N-S oriented Bozdoğan and Karacasu grabens, of which the boundary faults of the latter are the source of seismic activity. Geomorphic indices, including drainage basin asymmetry, mountain front sinuosity, valley-floor width to valley height ratio, stream length-gradient index and normalized channel steepness index, were used to evaluate the boundary fault segments of the Bozdoğan and Karacasu grabens. The results indicate that both grabens are tectonically active and therefore regions of earthquake potential, consistent with the epicenters of earthquakes. Thus, it can be inferred that fault segments of second-order grabens, which are crosscut by the boundary faults of seismically active main depressions, are apparently reactivated by ongoing tectonism and may represent seismic activity. This suggestion applies also for similar basins located in the western Anatolia

Comparative study of the marine terraces along the Bulgarian and Turkish Black Sea coasts for determination of the tectonic effect and environmental change

.....

Evolution Of Camlik Fissure-Ridge Travertines In The Baskale Basin (Van, Eastern Anatolia)

Fissure-ridge travertines (FRTs) are of great importance for the determination and comparison of tectonic deformation in a region. The coeval development of these travertines with active fault zones supplies significant information about regional dynamics in terms of deformation pattern and evolution. In this paper, the characteristics of FRTs of the Baskale basin (eastern Turkey) and responsible regional tectonism are discussed for the first time. The Baskale basin is located between the Baskale Fault Zone (BFZ) characterised by Camlik fault and Isikli-Ziranis fault. It is located between dextral Yuksekova Fault Zone and southern end of dextral Guilato-Siahcheshmeh-Khoy Fault system (Iran). Various morphological features indicating recent activity are exposed along the BFZ, including offsetting rivers, fissure-ridge travertine and fault scarps. The Camlik fissure-ridge travertine composing of three different depositions is observed along the eastern edge of the BFZ with approximately parallel orientations. The Famlik fissure-ridge travertine has been formed and developed on fault zone related to strike-slip or oblique movements. We explain how kinematic changes of faults can influence the fissure-ridge development.WoSScopu