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    A challenging archaeo-geophysical exploration through GPR and ERT surveys on the Keber Tepe, City Hill of Doliche, Commagene (Gaziantep, SE Turkey)
    (Elsevier, 2021) Balkaya, Caglayan; Ekinci, Yunus Levent; Cakmak, Olcay; Blomer, Michael; Arnkens, Julia; Kaya, Mehmet Ali
    Doliche is an ancient city located at the northern fringe of Gaziantep in SE Turkey. The settlement spreads over a shallow hill called Keber Tepe. However, the lack of visible remains on the surface severely limits the comprehension of the spatial organization of the site. To understand the ancient city layout, but also to identify promising starting points of archaeological investigations, geophysical exploration plays a substantial role. In 2019 and 2020 campaigns, ground-penetrating radar (GPR) and electrical resistivity tomography (ERT) surveys were conducted to determine anthropogenic structures in selected three study areas (SA) of the hill. Among them, SA-1 is adjacent to an excavation area on the south slope of the hill, where a large three-aisled Christian basilica had been discovered. SA-2 is in the eastern part of the city area, next to a sizeable civic bath building of the Roman period. Lastly, SA-3 covers the mosaic floor of the central nave and the terrace of the basilica where archaeological excavations were carried out in 2020 compaign. Archaeo-geophysical survey presented a challenging task as Keber Tepe is mainly composed of clayish-limestone and the same material had been used for architectural construction. Despite the disadvantages, GPR provided partial traces of the nave walls conforming with the existing basilica structures. The archaeological trenchs conducted in SA-3 confirm the partial reflection properties observed in the GPR sections. ERT surveys in this area provided subsurface models containing traces of anthropogenic structures unearthed. Since the findings obtained from both methods support each other very well in SA-2, we assumed that the field condition in this region of the hill is different or buried materials have lesser clay content in comparison to SA-1 and SA-3. As a result, the archaeo-geophysical survey contributed to the understanding of the archaeological structures and help to identify promising areas for further archaeological excavations. (C) 2021 Elsevier B.V. All rights reserved.
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    Integrated geophysical investigations to reconstruct the archaeological features in the episcopal district of Side (Antalya, Southern Turkey)
    (Elsevier Science Bv, 2019) Akca, Irfan; Balkaya, Caglayan; Puelz, Andreas; Alanyali, H. Sabri; Kaya, Mehmet Ali
    Electrical resistivity tomography (ERT) and ground-penetrating radar (GPR) are frequently used geophysical methods in the exploration of near-surface targets such as archaeological features. These methods were therefore applied to investigate a wide area in the Side ancient city located nearby the Manavgat district of Antalya, Turkey. The main purpose of the geophysical survey was to answer several questions about the design or usage of a huge area located nearby the episcopal residence of Side that belongs to the late antique/early Byzantine times (5th/6th century AD.). The investigation area is thought to be the garden (hortus) of the residence. The survey site covering an area of approximately 6000m(2) was investigated in detail by two geophysical survey campaigns carried out in 2016 and 2017. During the two survey campaigns, 102 ERT and 127 GPR lines were measured. ERT data were collected by dipole-dipole electrode array, and a 500 MHz shielded antenna was used to measure the GPR data. By evaluating both data sets with appropriate processing steps, 3D geophysical models of the survey area were produced. These models provided obvious traces of buried anthropogenic structures, characterized by relatively high resistivity and high EM wave reflection amplitude. The identified structures lay on the NS-EW axis, which is consistent with the major layout of the city; however, they do not correctly align with the late period structures currently standing on the ground. Therefore, it is interpreted that these buildings belong to a predecessor period (i.e. Roman Imperial Period). Further information such as the purpose of the use of these buildings can only be revealed by an archaeological excavation. (C) 2019 Elsevier B.V. All rights reserved.