Seismic Site Effect Modelling Based on In Situ Borehole Measurements in Bucharest, Romania

  • Andrei Bala
  • S. Florin Balan
  • Joachim Ritter
  • Dieter Hannich
Conference paper

DOI: 10.1007/978-90-481-2697-2_8

Part of the book series NATO Science for Peace and Security Series C: Environmental Security (NAPSC)
Cite this paper as:
Bala A., Balan S.F., Ritter J., Hannich D. (2009) Seismic Site Effect Modelling Based on In Situ Borehole Measurements in Bucharest, Romania. In: Schanz T., Iankov R. (eds) Coupled Site and Soil-Structure Interaction Effects with Application to Seismic Risk Mitigation. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht

Within the NATO Science for Peace Project 981882 “Site-effect analyses for the earthquake-endangered metropolis Bucharest, Romania” we determined a complete and homogeneous dataset of seismic, soil-mechanic and elasto-dynamic parameters. Ten 50 m deep boreholes were drilled in the metropolitan area of Bucharest in order to recover cores for dynamic tests and to measure vertical seismic profiles. These are used for an updated microzonation map related to earthquake wave amplification. The boreholes are placed near former or existing seismic station sites to allow a direct comparison and calibration of the borehole data with actual seismological measurements. A database is assembled which contains P- and S-wave velocity, density, geotechnical parameters measured at rock samples and geological characteristics for each sedimentary layer. Using SHAKE2000 we compute spectral acceleration response and transfer functions obtained from the in situ measurements. The acceleration response spectra correspond to the shear-wave amplifications excited in the sedimentary layers from 50 m depth (maximum depth) up to the surface. We present the acceleration response results from four sites.

Keywords

seismic site effects in situ measurements equivalent linear modelling 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Andrei Bala
    • 1
  • S. Florin Balan
    • 1
  • Joachim Ritter
    • 2
  • Dieter Hannich
    • 2
  1. 1.National Institute for Earth PhysicsBucharest-MagureleRomania
  2. 2.Universität Karlsruhe (TH)Germany