DEVELOPMENT OF A 3-D TOPOGRAPHICAL BASIN STRUCTURE BASED ON SEISMIC AND GEOTECHNICAL DATA: CASE STUDY AT A HIGH SEISMICTY AREA OF GÖLYAKA, DÜZCE, TURKEY

Date

2018-06-21

Author

Yousefıbavıl, Karim
Koçkar, Mustafa Kerem
Akgün, Haluk

Metadata

Show full item record

Item Usage Stats

187
views

0
downloads

The near-fault situation and high seismicity of an area makes the determination of the bedrock geometry more complex, and in return, it makes this area much more critical and important for the studies of site response analysis in account of seismic hazard assessment. Without a good model of topography and basin structure, any powerful calculation method would be in lack of a well-developed basin response. The study has been conducted in the Gölyaka basin that uniquely falls within the bifurcated section of the North Anatolian Fault System. The surface rupture of the 1999 Earthquakes of Kocaeli (Mw=7.4) and Düzce (Mw=7.2) bound this tectonically formed basin, respectively. In the study area, a 3-D basin structure of the model has been developed based on the geophysical and geotechnical data along with the geology. In particular, combined active and passive surface wave methods along with the H/V microtremor measurements at 29 locations, the vertical electrical sounding at 14 locations, the geotechnical boring data at about 30 locations and one deep boring data have been used to develop the structure of the sediment basin. The high-resolution 1-D shear wave velocity profile has been obtained through surface wave methods by using active Multichannel Analysis of Surface Waves (MASW) and passive Microtremor Array Method (MAM), respectively. The Schlumberger Vertical electrical sounding (VES) method has been applied to evaluate the bedrock of the basin depth. Furthermore, the H/V measurements have been carried out to be correlated with the fundamental period of the deepest point of the constructed basin. Finally, geotechnical and deep boring data have also been used along with the basin geology to be cross-referenced with the 1-D Vs profile. The result of this comprehensive survey led to a well-developed 3-D geometry model of the Gölyaka basin. The 3-D basin geometry model has been developed from the seismic surface wave results and later correlated with the results of the VES, deep Gölyaka basin fundamental periods and geotechnical boring data. Based on the surface wave results and the 2-D velocity profiles obtained, a bedrock level with an average velocity of 1100 m/s was accepted as the bedrock depth limit in the region. The implemented deep and geotechnical boring data with seismic results suggested that Gölyaka basin is composed of about five to seven sedimentary layers. It was concluded that the thicknesses of the alluvial sediments within the Gölyaka basin were estimated to be about 200-350 m, with irregular basin geometry and heterogeneity due to over-step faulting near the basin boundary. Furthermore, this in return, has resulted in inclined layering and nonlinearity in the velocity profile. The constructed model can successfully be used for site effects characterization and response studies in the region.

Subject Keywords

Basin topography, H/V methods, VES, 3D-Vs basin geometry model, Gölyaka-Düzce

URI

http://www.16ecee.org/programme/conference_schedule
https://hdl.handle.net/11511/72347
http://papers.16ecee.org/files/16ECEE%20FullPaper%20Thessaloiki.pdf

Conference Name

16th European Conference on Earthquake Engineering (16ECEE) (18 - 21 Haziran 2018)

Collections

Unverified, Conference / Seminar

Suggestions

OpenMETU
Core

Evaluation of site effects based on the 1999 Kocaeli and Düzce earthquake events and seismic microzonation of Gölyaka, Düzce, Turkey YOUSEFI BAVIL, KARIM; Akgün, Haluk; Koçkar, Mustafa Kerem; Department of Geological Engineering (2022-2) The high seismicity study area situated in a near-fault region in Gölyaka, Düzce, makes the determination of the bedrock geometry more complex, and hence, it makes this area very challenging in terms of a site response study that would aid a seismic hazard assessment. This study developed a basin model to evaluate the site effects in the tectonically controlled and formed Plio-Quaternary fluvial sediments of the Gölyaka region that uniquely falls within the bifurcated near-field fault section of the North A...
3-D basin geometry model to determine the site effects based on geophysical and geotechnical data: Case study at near-field and high seismicity area of Gölyaka, Düzce, Turkey. Yousefibavil, Karim; Koçkar, Mustafa Kerem; Akgün, Haluk (2018-04-13) The near-field and high seismicity of the area makes the determination of the bedrock geometry more complex and pioneers the studies of site response analysis in account for a seismic hazard assessment. Without a good model of basin structure, any powerful calculation method would lack a well-developed basin response. The study has been conducted in the Gölyaka basin that uniquely falls within the bifurcated near-field section of the North Anatolian Fault System. The surface rupture of the 1999 Earthquakes ...
Assessment of seismic soil liquefaction triggering beneath building foundation systems Çetin, Kemal Önder; Jeremic, Boris (2012-12-01) Although there exist some consensus on seismic soil liquefaction assessment of free field level soil sites, estimating liquefaction triggering potential beneath foundations still stays as a controversial and difficult issue. Assessing liquefaction triggering potential under mat foundations requires the estimation of cyclic and static stresses and the state of the soil medium. As part of these studies, conventionally used normalized cyclic demand term, cyclic stress ratio, is to be estimated addressing the s...
An Investigation on the Use of Simulated Records in Derivation of Fragility Curves for RC Buildings in Duzce Kadaş, Koray; Karim Zadeh Naghshineh, Shaghayegh; Askan Gündoğan, Ayşegül; Erberik, Murat Altuğ; Yakut, Ahmet (2017-10-11) Probabilistic assessment of seismic damage for an individual building or a building stock in terms of fragility curves generally requires utilization of ground motion records either seismologically consistent with the probable hazard for the area studied or chosen arbitrarily without considering the seismological characteristics, but covering a range of intensity levels. In both alternatives, the analyst should select several records to be able to perform the probabilistic studies accurately. This condition...
An integrated seismic hazard framework for liquefaction triggering assessment of earthfill dams' foundation soils Ünsal Oral, Sevinç; Çetin, Kemal Önder; Department of Civil Engineering (2009) Within the confines of this study, seismic soil liquefaction triggering potential of a dam foundation is assessed within an integrated probabilistic seismic hazard assessment framework. More specifically, the scheme presented hereby directly integrates effective stress-based seismic soil liquefaction triggering assessment with seismic hazard analysis framework, supported by an illustrative case. The proposed methodology successively, i) processes the discrete stages of probabilistic seismic hazard workflow ...

Citation Formats

K. Yousefıbavıl, M. K. Koçkar, and H. Akgün, “DEVELOPMENT OF A 3-D TOPOGRAPHICAL BASIN STRUCTURE BASED ON SEISMIC AND GEOTECHNICAL DATA: CASE STUDY AT A HIGH SEISMICTY AREA OF GÖLYAKA, DÜZCE, TURKEY,” Thessaloniki, Greece, 2018, p. 1, Accessed: 00, 2021. [Online]. Available: http://www.16ecee.org/programme/conference_schedule.