Historical Earthquakes That Damaged Hierapolis and Laodikeia Antique Cities and Their Implications for Earthquake Potential of Denizli Basin in Western Turkey
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Bull Eng Geol Environ DOI 10.1007/s10064-015-0791-0 ORIGINAL PAPER Historical earthquakes that damaged Hierapolis and Laodikeia antique cities and their implications for earthquake potential of Denizli basin in western Turkey 1 2 3 4 Halil Kumsar • O¨ mer Aydan • Celal S¸ ims¸ek • Francesco D’Andria Received: 19 November 2014 / Accepted: 24 August 2015 Ó Springer-Verlag Berlin Heidelberg 2015 Abstract Denizli basin is situated at the junction of NW– severe damage is induced by earthquakes having a mag- SE trending Gediz Graben and E–W trending Bu¨yu¨k nitude 6.5 or more. However, the largest earthquake could Menderes Graben in the eastern part of the western Ana- be up to 7.1 in the Denizli Basin. dolu (Anatolian) extensional province in western Turkey, which has been home to many civilizations during its long Keywords Lykos valley Á Hierapolis Á Laodikeia Á history and therefore has ruins of many antique cities and Denizli Á Geo-archaeology Á Earthquake relic settlements. Most of antique cities were destroyed by strong earthquakes that occurred in ancient times. Strong historical earthquakes in Denizli basin caused heavy Introduction damage to antique cities in the region, namely, Hierapolis in Pamukkale, Laodikeia in Denizli city center, colassae in There is a tendency of ancient civilizations of the old world to Honaz, Attuda in Babadag˘ and Tripolis in Buldan. A strong be located along plate boundaries of the transcurrent to earthquake occurred in the early seventh century AD in convergene type. The most pertinent tectonic micro-envi- Lykos (C¸u¨ru¨ksu) Valley of the Denizli area, heavily ronment involves extensional faulting (Force and McFagden damaging the antique cities in the region and causing 2010). Recurrence of destructive seismic activity has influ- people to abandon their cities. Recent archaeological enced the development of societies through history. Many excavations in Hierapolis and Laodikeia clearly revealed antique cities were rebuilt on the ruins of collapsed ancient many relics associated with the early seventh century AD structures, and some ancient cities were abandoned due to earthquake. For example, the collapse directions of col- heavy damage, with survivors settling in different places. umns and walls are mainly towards the NE or SW. The Archeoseismological relics in different antique cities in surface ruptures in the Hierapolis antique city area in the the Aegean and East Mediterranean region have been Pamukkale area prove that Pamukkale Fault is the main evaluated and discussed by various researchers (Schaeffer active fault producing strong earthquakes in the region, and 1968; Ambraseys 1971; Kilian 1996; Nur and Cline 1999), to find out either a single strong earthquake or an earth- quake storm caused the destruction of antiquity in the & Halil Kumsar region for a period of 50 years between 1225 and 1175 BC. [email protected] Big earthquakes in the Aegean and Mediterranean Seas 1 Department of Geological Engineering, Pamukkale caused heavy damage to historical buildings, followed by University, Denizli, Turkey devastating tsunamis, as happened in Crete on 21 July AD 2 Department of Civil Engineering and Architecture, 365 (Guidoboni et al. 1994; Yolsal et al. 2008). Inland University of the Ryukyus, Nishihara, Okinawa, Japan earthquakes also caused heavy damage to historical places, 3 Department of Archaeology, Pamukkale University, Denizli, such as surface ruptures along earthquake faults, as in Turkey Nimrod Fortress and Mamshit (Kamai and Hatzor 2008), 4 Department of Archaeology, University of Salento, Lecce, Susita (Yagoda-Biran and Hatzor 2010), Hierapolis (Han- Italy cock and Altunel 1997; Aydan and Kumsar 2005), and 123 H. Kumsar et al. Sagalassos (Similox-Tohon et al. 2006); slope failures, as year (Jackson and McKenzie 1988; McClusky et al. 2000; in Stratonikeia (So¨g˘u¨t 2014), and change in the direction of Bozkurt 2001), has been well described and numerously river beds, as in Colossae (Piccardi 2007). debated (Van Noten et al. 2013). Northward migration of Antique cities in western Anadolu are usually located the Arabian microplate to the eastern Anadolu plate and the along an active fault zone where there are spring waters or subduction of the North African oceanic crust below the thermal water discharges, and a strategic hill site found to Anadolu plate in the Aegean region caused lateral trans- control the basin. Most of the antique cities were destroyed pressional and transtensional deformation in the Anatolian by strong earthquakes that occurred in ancient times; for Block, such as exemplified by several intraplate strike–slip example, Hierapolis (Pamukkale), Tripolis (Yenice), Lao- faults and the dominantly dextral and sinistral interpolate dikeia (Laodecia), Colossae (Khonia or Honaz) in Denizli, strike–slip motions along the North Anatolian and East Aphrodisias (Geyre) and Magnesia (Gu¨mu¨s¸ler) in Aydın, Anatolian fault zones, respectively (Bozkurt 2001; van Ephesus (Apasa or Efes), Metropolis (Yeniko¨y–Torbalı), Hinsbergen et al. 2010; Westaway et al. 2005; Van Noten Smyrna (old I˙zmir), Lagina (Karatoprak or Turgutreis), et al. 2013) (Fig. 1a). Stratonikeia (Eskihisar) and Knidos (Yazıko¨y) in Mug˘la The subduction of the North African oceanic crust (Altunel 1999, 2000, Aydan 1997; Aydan and Kumsar below the Anadolu plate in the Aegean region caused N–S 2005; Kumsar and Aydan 2007; D’Andria 2003; D’Andria extension in the West Anatolian Extensional Province that et al. 2008;S¸ ims¸ek 2007, 2013;Tırpan and So¨g˘u¨t 2005). It is accompanied by normal faulting and the development of should be noted that the original names of these settlements many E–W oriented basins in western Turkey (Westaway belonging to the Hattian period were all changed following 1993; Aydan 1997; Aydan and Kumsar 2014; Van Noten the migration of Hittites into Anadolu and subsequent et al. 2013; Demirciog˘lu et al. 2010; Koc¸yig˘it 2005; colonization during Hellenistic and Roman periods. Fur- Koc¸yig˘it and Deveci 2007). These geodynamic processes thermore, some confusion results from historians, who triggered the orogenic collapse of the Menderes Massif in often quote Greek or Roman names rather than original the Miocene and caused the Pliocene to Quaternary local names; this is a common issue not only places in development of the main E–W grabens and NW–SE or Turkey, but also in other countries in the Middle East. NE–SW cross-grabens in western Turkey (Westaway 1993; Excavations in antique cities bring to daylight earthquake Westaway et al. 2005; Van Noten et al. 2013). relics related to seismicity of the region during the history of As the extension straining of the upper crust in the the city. These relics give an idea about the magnitude of a western Anadolu continues and rotates anti-clockwise, the possible foreseen strong earthquake in the region. Earth- development of graben-horst structures in the western quake relics in the Denizli Basin have been studied by Anadolu, including the I˙zmir, Aydın and Denizli regions, is Altunel and Hancock (1993a, b), Altunel (1996), Hancock still going on. Due to the subduction of the African plate and Altunel (1997), C¸akır(1999), Hancock et al. (1999), beneath the Anadolu plate, the western Anadolu exhibits a Altunel and Karabacak (2005), and Piccardi (2007). These high seismic activity (Aydan 1997; Aydan et al. 2000; investigations mainly cover faulting, damages on travertine Reilinger et al. 1997). channels and damaged structures in Hierapolis. Piccardi The Denizli Basin is situated in the junction of NW–SE (2007) focused on the AD 60 earthquake by using early trending Gediz Graben and E–W trending Bu¨yu¨k Menderes Christian and medieval legend, which include the apparition Graben in the eastern part of the Western Anadolu of Archangel Michael at Colossae and the apocryphal Extensional Province (Fig. 1b). The oldest bedrocks in the account of the arrival of St Philip at Hierapolis. basin, exposed on the graben shoulders and in the moun- Excavations were started in Laodikeia antique city in the tainous horst areas, are composed of schists, marbles and Denizli Basin in 2003. There have been new archeoseis- gneiss that are cover units of the Menderes Massif (Bozkurt mological findings. This paper is focused on investigation and Oberha¨nsli 2001; Erdog˘an and Gu¨ngo¨r 2004) and the of seismicity of the Denizli Basin from relics and traces allochthonous Mesozoic limestone, dolomite, and gypsum induced by past earthquakes in the antique cities of Hier- of the Lycian Nappes (Alc¸ic¸ek et al. 2003), which tecton- apolis and Laodikeia, and evaluation of the seismic activity ically overlie the Menderes Massif (Okay 1989). The Sr of the region in historical time and in the last century. isotope data from the gypsum formation as a tectonic slice display Late Triassic age of the Mediterranean belt (Gu¨n- dog˘an et al. 2008). The Neogene fill overlying uncon- Geological and tectonic setting formably the bedrock units is formed from alluvial, fluvial and lacustrine deposits (Alc¸ic¸ek et al. 2007). The continental extensional deformation of western Ana- The Denizli Basin is a graben bounded by a series of dolu (Turkey), one of the most seismically active tectonic normal faults along the margins (Koc¸yig˘it 2005; Westaway regions on the Earth with an extension rate of 30–40 mm/ et al. 2005; Kaymakc¸ı 2006; Van Noten et al. 2013; Hanc¸er 123 Historical earthquakes that damaged Hierapolis and Laodikeia antique cities and their implications… Fig. 1 a Simplified tectonic map of Turkey (NAFZ North Anadolu relatively small NW–SE to NE–SW trending cross-basins (after Fault Zone, EAFZ East Anadolu Fault Zone, WAEP West Anadolu Kaymakc¸ı 2006; Van Noten et al. 2013) Extensional Province, Dnz Denizli Basin), b E–W oriented basins, 2013). As seen in Fig. 2, the boundary faults are in seg- The striations and internal structure of the faults are ments at the north and south margins (C¸akır 1999) and evidence of the stress state that caused them, and may also range up to 15 km long, such as the Honaz fault segment, indicate the type of earthquake they produced.