Estimation of the crustal structure in Central Anatolia (Turkey) using receiver functions

Estimation of the crustal structure in Central Anatolia (Turkey) using receiver functions

The receiver function analysis method was used to determine the crustal structure in Central Anatolia, Turkey, by usingteleseismic earthquake records. The method is based on the conversion of incident P waves into S waves reaching an interface in thecrust or upper mantle and arrival of the converted wave to the station just after the direct P waves. A temporary seismic network, theAnkara Earthquake Monitoring Network (AnkNET), consisting of six broadband seismograph stations, has been deployed in order tomonitor the seismicity in Ankara and its surroundings during the period of 2007 2010. In this study, the crustal structures beneathAnkNET stations were investigated. The stations were located between latitudes 39°N and 41°N and longitudes 32°E and 34°E about100 km apart from each other around a circle with a radius of about 100 km, including one in Ankara approximately in the center.Hypocentral parameters of 43 teleseismic earthquakes equal to or greater than an instrumental magnitude Mw of 6.5 that occurred at adistance between 30° and 100° far from the central coordinates of AnkNET (40°N, 33°E) were retrieved from the Incorporated ResearchInstitutions for Seismology earthquake catalogue. According to the results of this study, the crustal thickness of the region is between34.5 km and 40.5 km and the S-wave velocity varies between 3.3 km/s and 4.1 km/s. It is expected that the calculated crustal thicknessand velocity values will contribute to future studies in the region.

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  • Akın U, Çiftçi Y (2011). Heat flow of the Kırşehir Massif and geological sources of the radiogenic heat production. Mineral Res Expl Bull 143: 53-73.
  • Ammon CJ (1991). The isolation of receiver effects from teleseismic P waveforms. Bull Seism Soc Am 81: 2504-2510.
  • Angus DA, Wilson D, Sandvol E, Ni JF (2005). Crustal and upper- mantle structure of Eastern Turkey from S-wave receiver functions. In: American Geophysical Union, Fall Meeting 2005, Abstract # S51E-1050.
  • Arslan S, Akın U, Alaca A (2010). Investigation of crustal structure of Turkey by means of gravity data. Mineral Res Expl Bull 140: 55-71.
  • Bilim F (2011). Investigation of the Galatian volcanic complex in the northern central Turkey using potential field data. Phys Earth Planet In 185: 36-43.
  • Çıvgın B, Kaypak B (2012). Investigation of one-dimensional crustal seismic velocity structure of Ankara and surroundings. Yerbilimleri 33: 131-150 (in Turkish with an abstract in English).
  • Erduran M, Çakır Ö, Tezel T, Şahin Ş, Alptekin Ö (2007). Anatolian surface wave evaluated at GEOFON Station ISP Isparta, Turkey. Tectonophysics 434: 39-54.
  • Ergün M, Oral EZ, Çifçi G (1995). Eastern Mediterranean structure and its place in plate tectonics. Jeofizik 9-10:71-78 (article in Turkish with an abstract in English).
  • Fnais MS (2004). The crustal and upper mantle shear velocity structure of eastern North America from the joint inversion of receiver function and surface-wave dispersion. PhD, Saint Louis University, St. Louis, USA.
  • Geissler WH (2005). Seismic and petrological investigations of the lithosphere in the swarm-earthquake and CO 2 degassing region Vogtland/NW-Bohemia. PhD, Helmholtz-Centre Potsdam – GFZ German Research Centre for Geosciences, Potsdam, Germany.
  • Goldstein P, Dodge D, Firpo M, Minner L (2003). SAC2000: Signal processing and analysis tools for seismologists and engineers. In: Lee WHK, Kanamori H, Jennings PC, Kisslinger C, editors. The IASPEI International Handbook of Earthquake and Engineering Seismology. London, UK: Academic Press.
  • Goldstein P, Snoke A (2005). SAC availability for the IRIS community. Incorporated Institutions for Seismology Data Management Center Electronic Newsletter 7: 1. Available online at http:// ds.iris.edu/ds/newsletter/vol7/no1/sac-availability-for-the- iris-community/.
  • Gürbüz C, Bekler T, Toksöz MN, Kuleli S, Kalafat D, Schultz C (2003). Seismic refraction studies and crustal structure in Anatolia. In: Commission on Controlled-Source Seismology: Deep Seismic Methods, 12th International Workshop, Mountain Lake, VA, USA, pp. 74-78.
  • Herrmann RB (1987). Computer Programs in Seismology. St Louis, MO, USA: Saint Louis University.
  • Hermann RB, Ammon CJ (2002). Computer Programs in Seismology: Surface Waves, Receiver Functions and Crustal Structure, Version 3.30. St Louis, MO, USA: Saint Louis University.
  • Kind R, Kosarev GL, Petersen NV (1995). Receiver functions at the stations of the German Regional Seismic Network (GRSN). Geophys J Int 121: 191-202.
  • Kind R, Vinnik LP (1988). The upper mantle discontinuities underneath the GRF array from P-to-S converted phases. J Geophys 62: 138-147.
  • Langston CA (1977). The effect of planar dipping structure on source and receiver responses for constant ray parameter. Bull Seism Soc Am 67: 1029-1050.
  • Langston CA (1979). Structure under Mount Rainier, Washington, inferred from teleseismic body waves. J Geophys Res 84: 4749- 4762.
  • Laske G, Masters G, Ma Z, Pasyanos M (2013). Update on CRUST1.0 - A 1-degree global model of Earth’s crust. EGU General Assembly EGU2013-2658. Munich, Germany: EGU.
  • Luccio F Di, Pasyanos ME (2007). Crustal and upper mantle structure in the Eastern Mediterranean from the analysis of surface wave dispersion curves. Geophys J Int 169: 1139-1152.
  • Maden N, Gelişli K, Eyüboğlu Y, Bektaş O (2009). Two-and-three- dimensional crustal thickness of the Eastern Pontides (NE Turkey). Turkish J Earth Sci 18: 225-238.
  • Marone F, van der Mejide M, van der Lee S, Giardini D (2003). Joint inversion of local, regional and teleseismic data for the crustal thickness in the Eurasia-Africa plate boundary. Geophys J Int 154: 499-514.
  • McClusky S, Balassanian S, Barka A, Demir C, Ergintav S, Georgiev I, Gurkan O, Hamburger M, Hurst K, Kahle H et al. (2000). Global Positioning System constraints on plate kinematics and dynamics in the eastern Mediterranean and Caucasus. J Geophys Res 105: 5695-5719.
  • McKenzie D (1972). Active tectonics of the Mediterranean region. Geophys J R Astron Soc 30: 190-185.
  • Molinari I, Morelli A (2011). EPcrust: A reference crustal model for the European plate. Geophys J Int 185: 352-364.
  • MTA (2007) Curie-Point Map of Turkey. Ankara, Turkey: General Directorate of Mineral Research and Exploration of Turkey.
  • MTA (2017). Crust Thickness Map of Turkey. Ankara, Turkey: General Directorate of Mineral Research and Exploration of Turkey. Available online at http://www.mta.gov.tr/eng/maps/ list.
  • Owens TJ (1987). Crustal structure of the Adirondacks determined from broadband teleseismic waveform modeling. J Geophys Res 92: 6391-6401.
  • Owens TJ, Zandt G, Taylor SR (1984). Seismic evidence for an ancient rift beneath the Cumberland Plateau, Tennessee: a detailed analysis of broadband teleseismic P waveforms. J Geophys Res 89: 7783-7795.
  • Pasquarè G, Poli S, Vezzoli L, Zanchi A (1988). Continental arc volcanism and tectonic setting in Central Anatolia, Turkey. Tectonophysics 146: 217-230.
  • Phinney RA (1964). Structure of the Earth’s crust from spectral behaviour of long-period body waves. J Geophys Res 69: 2997- 3017.
  • Salah MK, Şahin Ş, Topatan U (2014). Crustal velocity and Vp/ Vs structures beneath central Anatolia from local seismic tomography. Arab J Geosci 7: 4101-4118.
  • Sandvol E, Seber D, Calvert A, Barazangi M (1998). Grid search modeling of receiver functions: Implications for crustal structure in the Middle East and North Africa. J Geophys Res 103: 26899-26917.
  • Saunders P, Priestley K, Taymaz T (1998). Variations in the crustal structure beneath western Turkey. Geophys J Int 134: 373-389.
  • Seyitoğlu G, Aktuğ B, Karadenizli L, Kaypak B, Şen Ş, Kazancı N, Işık V, Esat K, Parlak O, Varol B et al. (2009a). A late Pliocene- Quaternary pinched crustal wedge in NW Central Anatolia, Turkey: a neotectonic structure accommodating the internal deformation of the Anatolian plate. Geol Bull Turkey 52: 121- 154.
  • Seyitoğlu G, Kaypak B, Işık V, Esat K, Çıvgın B (2009b). Earthquake Monitoring Network of Ankara (AnkNET). In: International Earthquake Symposium, Kocaeli 2009 Abstracts, p. 102.
  • Tezel T, Shibutani T, Kaypak B (2013). Crustal thickness of Turkey determined by receiver function. J Asian Earth Sci 75: 36-45.
  • Türkelli N (1984). Seismic investigation of the crustal structure in central Anatolia. PhD, Middle East Technical University, Ankara, Turkey.
  • Uluocak EŞ, Pysklywec R, Göğüş OH (2016). Present-day dynamic and residual topography in Central Anatolia. Geophys J Int 206: 1515-1525.
  • Vanacore EA, Taymaz T, Saygın E (2013). Moho structure of the Anatolian Plate from receiver function analysis. Geophys J Int 193: 329-337.
  • Vinnik LP (1977). Detection of waves converted from P to SV in the mantle. Phys Earth Planet In 15: 39-45.
  • Whitney DL, Dilek Y (1997). Core complex development in Central Anatolia, Turkey. Geology 75: 1023-1026.
  • Zhu H, Kanamori H (2000). Moho depth variation in southern California from teleseismic receiver functions. J Geophys Res 105: 2969-2980.
  • Zhu L, Mitchell BJ, Akyol N, Çemen I, Kekovalı K (2006). Crustal thickness variations in the Aegean region and implications for the extension of continental crust. J Geophys Res 111: B01301.