Yazar "Erduran, Murat" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • [ X ]
    Öğe
    A potential landslide area investigated by 2.5D electrical resistivity tomography: case study from Canakkale, Turkey
    (Springer Heidelberg, 2016) Coskun, Nart; Cakir, Ozcan; Erduran, Murat; Kutlu, Yusuf Arif; Cetiner, Ziya Sedat
    Geophysical methods provide important tools to investigate the shallow earth. One of these methods is electrical resistivity tomography (ERT), which has the capability to provide spatial and volumetric information on both subsurface structures and property variations. Specifically, the ERT is an important tool to define the geometry and characteristics of landslides. In this study, we share our results for an electrical resistivity tomography survey that we conducted on a field where the city of Canakkale, Turkey has a plan to build a War Museum approximately 56 acres wide. The construction field under consideration presents potential landslide risks prominent with high slopes on especially the northeastern side of the area. Because of possible intense load on the ground anticipated from deployment of heavy artillery and also from construction sites, landslide risks in the field are significantly increased. Quaternary-aged alluvial formations consisting of unconsolidated clastic sediments cover the region. In order to investigate the area, we carried out 2.5-dimensional resistivity survey using a multi-channel, multi-electrode system along 16 profiles with a total length of 2016 m. Borehole information from ten close wells was used to aid the interpretation of resistivity sections. The results showed that the shallow electrical structure beneath the study area is multi-layered of which the second layer from the top has the lowest resistivity and then the resistivity values steadily increase with depth. The low resistivity in the second layer is likely caused by extra water injection into the system from relatively high topographic structures to the southeast and also from nearby water channel that partly perimeters the study area. The bottom of low resistivity layer exhibits potential landslide surface overriding the deeper slate bedrock with relatively high resistivity. The excess load after the planned construction may trigger catastrophic slip along this slip interface. Based on our observations, we proposed some protective measures to avoid the landslides in the considered area.
  • [ X ]
    Öğe
    Melt in the mantle and seismic azimuthal anisotropy: evidence from Anatolia
    (Oxford Univ Press, 2016) Vinnik, Lev; Oreshin, Sergey; Erduran, Murat
    Observations of shear wave splitting in SKS seismic phase play a key role in the current efforts to understand kinematics and dynamics of mantle flow, but azimuthal anisotropy as a depth-localized phenomenon still is poorly known. Here we analyse stratification of seismic azimuthal anisotropy beneath central and northern Anatolia (a microplate within the Alpine belt) by inverting P-wave receiver functions jointly with shear wave splitting in SKS seismic phase. The analysis is based on recordings of stations of the North Anatolian Fault (NAF) passive seismic experiment. In the resulting model in a depth interval from 120 to 200 km fast direction of anisotropy is nearly parallel to the plate motion direction (similar to E-W), whilst a normal direction (close to S-N) is found in the low velocity zone (LVZ) between 60 and 90 km. Our preferred interpretation of these data suggests that the flow in upper mantle is nearly parallel to the Anatolian plate motion direction in the depth range from the LAB to 200 km, but in part of the LVZ fast direction of anisotropy is normal to the direction of shear in the mantle. This relation between anisotropy and shear is known from laboratory experiments with peridotite-type rock containing melt. A similar relation between anisotropy and flow in the LVZ is found in Fennoscandia. These findings may have far-reaching implications for interpreting mantle anisotropy elsewhere.
  • [ X ]
    Öğe
  • [ X ]
    Öğe
    Preliminary investigation of underground settlements of Nevsehir Castle region using 2.5-D electrical resistivity tomography: Cappadocia, Turkey
    (Springer Heidelberg, 2016) Coskun, Nart; Cakir, Ozcan; Erduran, Murat; Kutlu, Yusuf Arif; Yalcin, Ali
    The Nevsehir Castle region located in the middle of Cappadocia with approximately cone shape is investigated for the existence of an underground city using the geophysical method of electrical resistivity tomography. Underground cities are commonly known to exist in Cappadocia. The current study has obtained important clues that there may be another one under the Nevsehir Castle region. Several 2.5-D resistivity profiles totaling approximately 4 km in length surrounding the Nevsehir Castle are measured to determine the distribution of electrical resistivities under the study area. Several high resistivity anomalies with a depth range 8-20 m are discovered to associate with a systematic void structure beneath the Nevsehir Castle. Because of the high-resolution resistivity measurement system currently employed, we were able to isolate the void anomalies from the embedding structure. Using 3-D visualization techniques, we show the extension of the void structure under the measured profiles.
  • [ X ]
    Öğe
    Yüzey Dalgası, P ve S Alıcı Fonksiyonları, Telesismik P ve S Seyahat Zamanı Rezidüelleri ve SKS Ayrımlaşma Verilerinden Anadolu Plakasının Kabuksal, Litosferik ve Astenosferik Hız Yapısının Anizotropik Olarak Saptanması
    (2014) Erduran, Murat; Kosarev, Grigoriy; Çakır, Özcan; Oreshın, Sergey; Vınnık, Lev; Kutlu, Yusuf Arif; Kıselev, Sergey
    [Abstract Not Available]