Local site characterization and seismic zonation study by utilizing active and passive surface wave methods: A case study for the northern side of Ankara, Turkey

Date

2012-11-29

Author

Eker, Arif Mert
Akgün, Haluk
Kockar, Mustafa Kerem

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

269
views

0
downloads

This study encompasses dynamic soil characterization and site classification zonation mapping of the Plio-Quaternary and especially Quaternary alluvial sediments based on the current seismic codes. The study area is located in the Cubuk district and its surrounding area that is situated towards the north of Ankara, the capital of Turkey. The project site is located in a region which has the potential of being seriously affected by probable seismic events occurring along the Cubuk Fault Zone. The Cubuk Fault Zone is thought to be a continuation of the Dodurga Fault Zone and a sub-fault belt of the North Anatolian Fault System that is one of the most prominent fault systems in Turkey with a significant earthquake potential. Sediment characteristics were determined and soil profiles were characterized by surface wave methods at different locations. Non-invasive seismic methods were used to obtain a shear wave velocity profile at 41 sites and two measurements were taken at each site for passive and active surface wave methods. The Multichannel Analysis of Surface Wave Method (MASW) and the Microtremor Array Method (MAM), which gave comparable results, were used as active and passive surface wave methods, respectively. By combining these two techniques, the shear wave velocity profile of the site was obtained. Additionally, the MAM survey alone was implemented at 10 of the sites, especially to get information on the deeper parts of the soil profiles. The geological characteristics of these sedimentary units were compared with the geological and geotechnical boring and seismic site characterization studies to classify the soil deposits. Therefore, the average shear wave velocity results and the variable characteristics of the seismic data along the soil profiles were correlated with these boring studies. This was performed to develop site categories which took site conditions into account according to the design codes of IBC (International Building Code) 2006 and TSC (Turkish Seismic Code) 1998. Consequently, the regional site classification map of the north of the Cubuk basin considering site classes was assessed based on the average shear wave velocity (Vs(30)) results in IBC 2006 and the shear wave velocity data and thickness of the surface layer based on the Vs values in the TSC.

Subject Keywords

Active and passive surface wave methods (MASW and MAM), Seismic site characterization, Average shear wave velocity (Vs(30)), Seismic zonation, Cubuk, Ankara

URI

https://hdl.handle.net/11511/32987

Journal

ENGINEERING GEOLOGY

DOI

https://doi.org/10.1016/j.enggeo.2012.09.002

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Evaluation of Site Characterizations and Site Effects of the Ankara Basin Turkey Koçkar, Mustafa Kerem; Akgün, Haluk (2007-06-28) The purpose of this study is to assess the in-situ site characteristics and to perform seismic hazard studies of the Upper Pliocene to Pleistocene fluvial and Quaternary alluvial and terrace deposits located towards the west of Ankara. Based on a general engineering geological, geotechnical and seismic characterization of the site, site classification systems were assigned for seismic hazard evaluations. Then, short-period noise recordings of the microtremor measurements at the ground surface have been used...
Fault-based probabilistic seismic hazard assessment of the eastern Makran subduction and the Chaman transform fault, Pakistan: Emphasis on the source characterization of megathrust Shah, Syed Tanvir; Özacar, Atilla Arda; Gülerce, Zeynep (Elsevier BV, 2021-01-01) Seismic source characterization (SSC) for probabilistic seismic hazard assessment (PSHA) in regions characterized by subduction megathrust involves a considerable ambiguity. Lack of detailed geologic, seismic, and geodetic data increases the uncertainties. The enigma is enhanced in regions where thin-skinned accretionary prism faults are part of active deformation. In this study, a planar SSC model for seismically active eastern Makran subduction zone, its associated accretionary prism faults and Chaman tra...
Ground-motion characterization for the probabilistic seismic hazard assessment in Turkey AKKAR, DEDE SİNAN; Kale, Ozkan; Yakut, Ahmet; Ceken, Ulubey (2018-08-01) This study describes the methodology implemented to establish the ground-motion logic-tree for national probabilistic seismic hazard map of Turkey for shallow active crustal regions. The presented procedure provides quantitative information to guide the hazard experts while establishing the logic tree to capture the epistemic uncertainty in ground-motion characterization. It uses non-data-driven and data-driven testing methods to identify and rank candidate ground-motion prediction equations (GMPEs) under a...
Thermal Anomaly and Alteration Mineral Mapping in İzmir Dikili Region by using ASTER and Investigation of the Geothermal Potential of the Region Cambazoğlu, Selim; Yal, Gözde Pınar; Eker, Arif Mert; Koçkar, Mustafa Kerem; Osman, Şen; Akgün, Haluk (null; 2014-03-14) This study encompasses the detection, mapping and validation of hydrothermal alteration types and minerals, surface temperature anomaly mapping utilizing remote sensing methods in order to assess the geothermal potential of the Dikili region. The study area covers Bergama, Dikili, Çandarlı and Altınova districts located at the northern part of İzmir Province where fumaroles and numerous thermal water outflows with temperatures between 63°C and 89°C are present. The study area is located at the northern part...
Effect of watershed partitioning on hydrologic parameters and estimation of hydrograph of an ungauged basin: a case study in Gokirmak and Kocanaz, Turkey Kocyigit, Musteyde Baduna; Akay, Huseyin; Yanmaz, Ali Melih (Springer Science and Business Media LLC, 2017-08-01) The main goal of this study is to investigate the effect of the size of the subbasins of a watershed on the hydrologic parameters and their spatial variability in an estimation of the hydrologic parameters and hydrograph of a neighbouring ungauged basin. In this paper, Hydrologic Engineering Center-Hydrologic Modelling System (HEC-HMS), a semi-distributed hydrologic model, is used to calibrate and cross-validate two flood events occurred in 1998 and then validate four other flood events occurred in 1991, 19...

Citation Formats

A. M. Eker, H. Akgün, and M. K. Kockar, “Local site characterization and seismic zonation study by utilizing active and passive surface wave methods: A case study for the northern side of Ankara, Turkey,” ENGINEERING GEOLOGY, pp. 64–81, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32987.