1887

Abstract

Summary

The contribution of local site effects to seismic hazard is significant in cities located on thick stack of loose Quaternary layers of sediments such as Bucharest City. Here, strong-motion recordings of major intermediatedepth Vrancea earthquakes in 1986 and 1990, as well as the disastrous effects of previous major earthquakes (in 1940 or 1977) proved the necessity and importance of microzonation maps not only for new building design, but also for a great part of Bucharest old buildings stock, which is in a critical need for urgent retrofitting. Some studies emphasized the conclusion that mean shear-wave velocities (Vs) corresponding to the main 7 geological layers in the Bucharest underground: i) are important and must be known until deeper depth of 100- 150 m, making Vs-30 an insufficient and obsolete proxy for the explanation of spectral acceleration peaks at surface (Bala et al., 2014); ii) in surface the values of Vs may vary considerably across the city in just a few hundreds of meters.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.202149BGS50
2021-10-10
2024-04-28
Loading full text...

Full text loading...

References

  1. Aldea, A., Yamanaka, H., Negulescu, C., Kashima, T., Radoi, R., Kazama, H., Calarasu, E.
    [2006] Extensive seismic instrumentation and geophysical investigation for site-response studies in Bucharest, Romania, Proceedings of the Third International Symposium on the Effects of Surface geology on Seismic Motion, Grenoble France, 30 Aug. – 1 Sept. 2006, paper 69.
    [Google Scholar]
  2. Bălă, A., Raileanu, V., Zihan, I., Ciugudean, V., Grecu, B.
    [2006] Physical and dynamic properties of the shallow sedimentary rocks in the Bucharest Metropolitan Area. Rom. Rep. in Physics, Vol. 58, no. 2: 221–250.
    [Google Scholar]
  3. Bălă, A., Hannich, D., Ritter, J.R.R., Ciugudean-Toma, V.
    [2011] Geological and Geophysical Model of the Quaternary Layers based on in situ measurements in Bucharest, Romania, Romanian Reports in Physics, 63(1): 250–274.
    [Google Scholar]
  4. Bălă, A.
    , [2014], Quantitative modelling of seismic site amplification in an earthquake-endangered capital city: Bucharest, Romania, Natural Hazards, 72, 1429–1445.
    [Google Scholar]
  5. Ciugudean - Toma, V. and Stefanescu, I.
    [2006] Engineering geology of the Bucharest city area, Romania, paper no. 235, IAEG -2006, Engineering Geology for tomorrow ‘s cities.
    [Google Scholar]
  6. Hannich, D. and Orlowsky, D.
    [2014] Shear-wave velcocities of the Quaternary layers, determined by Multy-Offset Seismic profiling (MOVSP) in Bucharest, Romania, Romanian Reports in Physics, 66, 4, 1207–1225.
    [Google Scholar]
  7. Hannich, D., Huber, G., Ehret, D., Hoetzl, H., Balan, S., Bala, A., Bretotean, M., Ciugudean, V.
    , [2006], SCPTU Techniques Used for shallow geologic/hydrogeologic Site Characterization in Bucharest, Romania. 3-rd International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, France, 30 Aug. - 1 Sept. 2006, paper 71.
    [Google Scholar]
  8. Liteanu, G
    [1952] Geology of the city of Bucharest, Technical Studies, Series E, Hydrogeology, No.1.
    [Google Scholar]
  9. Lungu, D., Aldea, A., Moldoveanu, T., Ciugudean, V., Stefănica, M.
    [1999] Near-surface geology and dynamic properties of soil in Bucharest, in F.Wenzel et al. (eds.) Vrancea Earthquakes: Tectonics Hazard and Risk Mitigation, 137–148.
    [Google Scholar]
  10. Mărmureanu, Gh., Cioflan, C.O., Mărmureanu, A.
    [2010] Cercetări privind hazardul seismic local (microzonare ) a zonei metropolitan București, Ed. Tehnopress, Iași, ISBN: 978-973-702-809-9.
    [Google Scholar]
  11. Romanian Code for the seismic design for buildings - P100-1/2013.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202149BGS50
Loading
/content/papers/10.3997/2214-4609.202149BGS50
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error