Could the coseismic fractures of a lake ice reflect the earthquake mechanism? (Afyon earthquakes of 2 March 2002, Central Anatolia, Turkey)

Yürür, Tekin; Köse, Onur; Demirbağ, Hünkar; Özkaymak, Çağlar; Selçuk, Levent

doi:10.1016/s0985-3111(03)00003-2

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…It is considered that this strain was formed by the earthquakes of a 6.3 magnitude that occurred around Bolvadin in 2002. This is supported by several studies that have reported that the 2002 earthquakes caused an energy transfer towards west [Demirtaş et al 2002;Koçyiğit et al 2002;Yürür et al, 2003;Ergin et al 2009] as demonstrated in the results of the strain analysis.…”

Section: Discussionsupporting

confidence: 73%

“…There are only limited number of studies on the ac-tive tectonics of AAG with most examining the period after the 2002 Çay earthquakes [Demirtaş et al, 2002;Emre et al, 2003;Koçyiğit and Ozacar., 2003;Ozden et al, 2002;Yürür et al, 2003;Ulusay et al, 2004; Akyüz Kaymakcı, 2006 andÖzkaymak, 2015). Abbreviations: ASFS, Aksehir Simav Fault System; DSFZ, Dead Sea Fault Zone; EAFZ, East Anatolian Fault Zone; NAFZ, North Anatolian Fault Zone; NEAFZ, Northeast Anatolian Fault Zone.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Palaeostress Analysis, Geodetic Strain Rates and Seismic Data in the the Western Part of the Sultandağı Fault in Turkey

Tiryakioğlu¹,

Özkaymak²,

Baybura³

et al. 2018

Annals of Geophysics

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The Sultandağı Fault is an active dip-slip normal fault bounding the southeastern border of the NW-SE striking Afyon-Akşehir Graben, an actively growing rift area in western Anatolia. The historical and instrumental earthquake record suggest the existence of a large number of earthquakes that created surface ruptures in this system. The recent activities of the Sultandağı Faul twere evidenced bytwo earthquakes that occurred on February 3, 2002 (Mw=6.3 and Mw=6.0) and caused a surface rupture up to 26 km along with an approximately 30 cm vertical displacement. The possible continuation of this earthquake migration towards the west, seismic gaps existing in the region, the presence of historical destructive earthquakes, and the active faults reveal the seismic hazard around the province of Afyonkarahisar. In this study, we determined the fault activities and stress directions in the western part of the Sultandağı Fault by comparing the results from the Palaeostress analysis of fault segments, focal mechanism solutions of recent earthquakes and geodetic analysis. The geologic, geodetic and earthquake data all indicate that both northern and southern master faults of the middle part of the Afyon-Akşehir Graben are dip-slip normal faults and were shaped under a NW-SE and NE-SW-directed bimodal extensional tectonic regime during the Quaternary-Holocenethe period.

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Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Comparison of Palaeostress Analysis, Geodetic Strain Rates and Seismic Data in the the Western Part of the Sultandağı Fault in Turkey

Tiryakioğlu¹,

Özkaymak²,

Baybura³

et al. 2018

Annals of Geophysics

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“…The historical and instrumental earthquake records indicate the existence of large number of earthquakes that created surface ruptures in this system. The latest one occurred on the Sultandağı Fault with a magnitude of 6.3 (03 February 2002) and caused a 26-km-long surface rupture in the middle part of the graben (Figure 2) (Yürür et al, 2002;Tan et al, 2008). The western sector of the AAG is controlled by active normal faults, namely Erkmen Fault, Gecek Fault, Gazlıgöl Fault, Karahisar Fault and Yarımca Fault.…”

Section: Geology Of the Study Areamentioning

confidence: 99%

Structural Evidence For Extensional Domain-Type Geothermal Play In Western Anatolia: A Case Study From Afyon-Akşehir Graben

Özkaymak¹,

Sözbi̇li̇r²

2020

Afyon Kocatepe University Journal of Sciences and Engineering

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Afyon-Akşehir Graben (AAG) which consists of the southeastern part of Akşehir-Simav Fault System (ASFS) is one of the active depression areas in Western Anatolia. The western sector of the NW-SEtrending AAG is controlled by many active normal fault segments, namely Erkmen, Gecek, and Gazlıgöl Faults. Two main geothermal fields namely, Ömer-Gecek and Gazlıgöl contain reservoirs of fluid with temperatures up to 130° C, are located on the junction points of Gecek-Erkmen faults and Gazlıgöl-Yarımca faults, respectively. The area contains three unconformity bounded geological units; Mesozoic rocks of the Afyon Metamorphic Zone (reservoir unit), Miocene volcano-sedimentary succession (cover unit), including several sedimentary and volcanic units and Quaternary modern basin-fills of alluvial, fluvial and travertine deposits. This study involves use of geological mapping and structural geology methods to identify play type of geothermal fields mentioned above. Paleostress inversion analysis based on basin-bounding active faults and active extensional cracks along the travertine deposits shows that the AAG has been deformed under the control of multidirectional extension, with E-W and NE-SW to NW-SE orientations since Plio-Quaternary time. These types of extension are directly related with the linkage of cross faults that oriented at high-angle to the strike of NW-SE-trending major breakaway fault of AAG. Field-based studies also reveals that geothermal fields in AAG develops on the interactions of these active faults on the extensional domain type geothermal play without active volcanism coming to the surface.

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Bolvadin’de (Afyon-Akşehir Grabeni, Afyon) Gözlenen Yüzey Deformasyonlarının Jeolojik, Jeomorfolojik ve Jeodezik Analizi

Özkaymak¹,

Sözbi̇li̇r²,

Tiryakioğlu³

et al. 2017

Türkiye Jeoloji Bülteni / Geological Bulletin of Turkey

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içerisinde yer alan Bolvadin yerleşim alanında gözlenmektedir. Bu alanda, bir kısmı imar planı içerisinde kalan bölge ile şehrin güneybatı kısmından başlayarak kuzeydoğu istikametine doğru yer alan bölgelerde, son 4 yıldan itibaren daha önceden olmayan bazı deformasyonlar oluşmuş ve oluşmaya devam etmektedir. Bölgede yapılan çalışmalarda, yıkıcı deprem olmaksızın, uzunlukları 300 metre ile 2 km; doğrultuları ise K15°D ile K70°D arasında değişen hareketler ve yarılmalar şeklinde gelişen kademeli yüzey deformasyonları haritalanmıştır. Yerleşim alanı içerisinde haritalanan yüzey deformasyonlarının en kuzeyde olanı Bolvadin Fayı'nın güneybatıdaki devamı niteliğindedir. Yapılan jeolojik ve jeomorfolojik analizler yüzey faylanmaları boyunca, güneydoğuda yer alan bloğun 10-40 cm arasında düştüğüne işaret etmektedir. Yapılan jeodezik analizler bölgedeki son dört yıllık düşey yerdeğiştirme hızının 7,1 cm/yıl olduğunu göstermektedir. Bu sonuçlar, Bolvadin Fayı boyunca gelişen yüzey deformasyonlarının önemli bir nedeninin, yeraltı su seviyesi düşüşüyle ilgili olduğunu göstermektedir. Söz konusu yüzey deformasyonlarının oluşumuna, bölge tektoniğinin katkısını ortaya koymak için hendek tabanlı paleosismolojik çalışmalara ihtiyaç vardır.

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Could the coseismic fractures of a lake ice reflect the earthquake mechanism? (Afyon earthquakes of 2 March 2002, Central Anatolia, Turkey)

Cited by 6 publications

References 1 publication

Comparison of Palaeostress Analysis, Geodetic Strain Rates and Seismic Data in the the Western Part of the Sultandağı Fault in Turkey

Comparison of Palaeostress Analysis, Geodetic Strain Rates and Seismic Data in the the Western Part of the Sultandağı Fault in Turkey

Structural Evidence For Extensional Domain-Type Geothermal Play In Western Anatolia: A Case Study From Afyon-Akşehir Graben

Bolvadin’de (Afyon-Akşehir Grabeni, Afyon) Gözlenen Yüzey Deformasyonlarının Jeolojik, Jeomorfolojik ve Jeodezik Analizi

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