Combined seismic methods for 3D modeling of quarternary deposits: Application to Skopje sedimentary basin

Scientific paper - Original scientific paper

• Author: Irena Gjorgjeska
• Author: Vlatko Sheshov
• Author: Kemal Edip
• Author: Julijana Bojadjieva
• Author's institution: University of Zagreb; Faculty of Civil Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract (english)

The large number of catastrophic earthquakes that have occurred worldwide and their
consequences point out the fact that the seismo-geological structure of the terrain represents
an amplitude-frequency modifier of the seismic effect. The unconsolidated sediments lying upon
the bedrock as well as the variations of the bedrock topography may increase the amplification
potential of the seismic effects depending on their physical properties and thickness. From this
aspect, there arises the need for obtaining as realistic as possible insight into the structure of the
terrain, i.e., definition of the geometry of the sedimentary basins. Particular attention in this study
was paid to definition of thickness variation of alluvial unconsolidated deposits that constitute
the Skopje sedimentary basin, reaching a depth of down to 200 m, as well as the topography of
the Neogene sediments present in the terrain base. For that purpose, preliminary 3D geological
modelling was done by interpolation of a number of boreholes made in the urban area of Skopje
city. Geophysical surveys were performed by application of active and passive seismic methods
as are seismic refraction, seismic reflection, Multichannel Analysis of Surface Waves (MASW),
Refraction Microtremor (REMI) and Horizontal-to-Vertical Spectral Ratio (HVSR) for the purpose
of defining the variation of the shear-wave velocity Vs through different lithological layers as
well as upgrading and improving the accuracy of the 3D model. Of particular importance for this
survey was the implementation of fast, economical and efficient procedure by using the combined
seismic methods approach, which enabled seismo-geological modeling to different scales as well
as comparative analysis of the results and verification of their accuracy

• Keywords (english): combined seismic methods, quaternary deposits, 3D model
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Unknown
• Publication version: Published version
• Publication title: 1st Croatian Conference on Earthquake Engineering 1CroCEE
• Numbering: pp. 299-306
• p-ISSN: 3043-8071
• DOI: https://doi.org/10.5592/CO/1CroCEE.2021.168
• URN:NBN: urn:nbn:hr:237:538581
• Publication: 2021-03
• Conference: Title: st Croatian Conference on Earthquake Engineering; Location: Zagreb, Croatia; Start date: 2021-03-22; End date: 2021-03-24; Assembly type: Lecture
• Type of resource: Text
• Publisher: Sveučilište u Zagrebu Građevinski fakultet
• Access conditions: Open access
• Created on: 2024-08-30 09:26:10