An Overview of the Current Seismicity of the Sultandağı Fault Zone (Afyonkarahisar- Konya, Western Anatolia)
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Bull. Min. Res. Exp. (2020) 163: 187-210 BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION Foreign Edition 2020 163 ISSN : 0026-4563 E-ISSN : 2651-3048 CONTENTS Research Articles First Turolian ndings in the Neogene sequence of Denizli Basin (SW Anatolia) and its regional palaeobiogeographic signi cance Bulletin of the Mineral ..............................................................................................................................Adil DOĞAN, Serdar MAYDA and M. Cihat ALÇİÇEK 1 Tectonic meaning of the deformation in shallow marine region between Gaziköy-Mürefte (Sea of Marmara) by using seismic re ection data, NW Anatolia Şule GÜRBOĞA, Asl Zeynep YAVUZOĞLU, Recep GÜNEY, Fatma Betül KARCI, Ayhan YAVUZOĞLU, Özgür TÜRKMEN, Pir Çağatay KARTAL, Bahri Serkan AYDEMİR, Murat EVREN, Murat CENK, Barbaros ŞİMŞEK, ...............................................Eyyüp ÖZBEK, Tuğrul Şükrü YURTSEVER, Füsun YİĞİT FETHİ, Eşref AYLAN and Uğur Zeki KIRAT 13 Using of GIS on eld geology studies: An application on central-southern of Eskişehir .............................................................................................................................. 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Denis TEŽAK, Nikola KRANJČIĆ, Bojan ĐURIN and Mihaela JURAS 115 A laboratory-scale investigation on freezing-thawing behavior of some natural stone samples manifactured in Turkey ..............................................................................................................................................................Gökhan EROL and Ozan BAYRAM 131 The relationship of soils developed on different parent materials in Niğde province with lithological units and determination of their suitability for usage agricultural purposes .................................................................................................................... Harun TORUNLAR, Abdurrahman LERMİ and Emin ÇİFTÇİ 141 Evolution of slab tearing-related high potassium volcanism: Petrogenetic data from the Emirdağ and İscehisar volcanic units .............................................................................................................. Selin BİLGİÇ GENCER, Sibel TATAR ERKÜL and Fuat ERKÜL 167 An overview of the current seismicity of the Sultandağ Fault Zone (Afyonkarahisar-Konya) .............................................................................................Doğan KALAFAT, Yavuz GÜNEŞ, Mehmet KARA and Kvanç KEKOVALI 187 Invited Article The electric power production targeted Unconventional Geothermal Systems (UGS), some conceptual designs and their thermodynamics classi cation ..................................................................................................................................................................................................Aydn ÇİÇEK 211 ACKNOWLEDGEMENT ............................................................................................................................................................................. 229 http://bulletin.mta.gov.tr Bulletin of the Mineral Research and Exploration Notes to the Authors.............................................................................................................. 231 An overview of the current seismicity of the Sultandağı Fault Zone (Afyonkarahisar- Konya, Western Anatolia) Doğan KALAFATa* , Yavuz GÜNEŞa , Mehmet KARAa and Kıvanç KEKOVALIa aKandilli Observatory and Earthquake Research Institute, RETMC, Boğaziçi University, İstanbul, Turkey Research Article Keywords: ABSTRACT Western Anatolia, Western Anatolia is one of the most seismically active regions in Turkey. The high seismic activity Sultandağı Fault Zone, is a result of a complex tectonic deformation dominated by the N-S extensional tectonic regime in Micro-earthquake, Western Anatolia. This tectonic deformation is also a result of the relative movement of the African- Seismic network, Digital broadband earthquake Arabian plates towards the north, which causes the Anatolian plate to shift 2.5 cm per year towards stations W-SW. One of the largest fault zones in the Western Anatolia, Sultandağı Fault Zone (SFZ) has a northwest-southeast trend. SFZ, approximately 120 km long, is an important tectonic structure, which produced three major earthquakes (Mw> 6.0) between the years of 2000 -2002. Therefore, the most significant goals of this study were to monitor the micro-earthquakes along SFZ, to enrich the current seismic network and to increase the earthquake detection threshold in the region (Mc <2.5). Within the scope of the study, 3 digital broadband earthquake stations were installed in the region. The analysis of the data obtained in the research indicated that the central and western parts of SFZ are active and there is intense seismic activity especially in the vicinity of Sultandağı, Çay, Çobanlar, and Afyonkarahisar. Fault plane solutions revealed that the earthquakes in the region generally occur with normal faulting with oblique components. Seismic stations installed within the scope of the Received Date: 05.12.2019 study contributed positively to the increase of the sensitivity (Mc = 1.3) of the earthquake detection Accepted Date: 13.04.2020 threshold (Mc) in the region and increased the detection capacity. 1. Introduction The last two earthquakes occurred consecutively on the Sultandağı Fault Zone (SFZ) on the same day, Sultandağı Fault Zone (SFZ) is one of the most and the main shocks were followed by extensive important tectonic structures in Western Anatolia aftershock activity. In this context, seismic activity and has produced 3 important earthquakes in the last in the form of an earthquake series in the region in two decades (Figure 1). Between the years 2000 and recent years has revealed that the faults around the northwestern end of SFZ, especially the ones around 2002, 3 major earthquakes (Mw> 6.0) occurred on the Çay-Sultandağı-Afyonkarahisar, are each an active Sultandağı Fault Zone, also called as Afyon-Akşehir fault segment that can be considered within this Graben. The first earthquake (Eber-Sultandağı fault zone. NW-SE and NE-SW trending faults play earthquake Mw = 6.0) occurred in 2000, followed an important role in the tectonic development of the by the Sultandağı (Mw 6.5) and Çay-Sultandağı region. This makes it necessary to monitor regularly earthquakes (Mw = 6.0) on February 3, 2002. and precisely both the micro-earthquake activity and Citation info: Kalafat, D., Güneş, Y., Kara, M., Kekovalı, K. 2020. An overview of the current seismicity of the Sultandağı Fault Zone (Afyonkarahisar-Konya, Western Anatolia). Bulletin of the Mineral Research and Exploration 163, 187-210. https://doi.org/10.19111/bulletinofmre.721796. *Corresponding author: Doğan KALAFAT, [email protected] 187 Bull. Min. Res. Exp. (2020) 163: 187-210 Figure 1- Study Area (Sultandağı Faut Zone), active fault zones and major tectonic plates across and in the vicinity of Turkey (active faults were taken from Emre et al., 2013; the figure was drawn using the GMT software; topography data was obtained from NASA- SRTM). the recent earthquake activity which continues as rock groups in terms of stratigraphic and structural series of earthquakes. The fact that the seismic stations features. Therefore, there are two basic views in the region were not sufficient before the study, and, regarding the neotectonic regime of the region. The therefore, that the current seismic activity could not first one is that it is a compression regime, which is be followed properly made up the key motivational suggested by various researchers (Boray et al., 1985; elements for the necessity to conduct a study in the Barka et al., 1995; Uysal, 1995; Altunel et al., 1999). region. In the second one, it is argued that no compression tectonic regime has occured in Isparta Bending after Therefore, monitoring the micro-earthquakes the early Messinian (upper Miocene) compression along SFZ, enriching the current seismic network and deformation phase, and that the neotectonic regime in increasing the earthquake detection threshold in the Isparta Bending is extensional (Koçyiğit, 1996; Glover region (Mc <2.5) were the