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Acta Geodaetica et Geophysica Hungarica

, Volume 45, Issue 3, pp 372–387 | Cite as

Deterministic seismic hazard assessment of the inner town of Budapest

  • K. GribovszkiEmail author
  • F. Schulek-Tóth
  • P. Varga
Article
  • 34 Downloads

Abstract

Deterministic seismic hazard computations were performed along four different profiles across the downtown of Budapest. Synthetic seismograms were computed by the so called “hybrid technique”. By applying the hybrid technique it is possible to take into account the focal source, the path and the site effect together. Four independent computations have been performed using the same seismic source but different profiles. The parameters of the seismic source were adopted from the parameters of the well-known 1956 Dunaharaszti earthquake. The focal mechanism and the homogeneous and heterogeneous parts of the profiles are known from geophysical and geological data of the investigated area.

As the results of the computations PGA (peak ground acceleration) grid maps of the downtown of Budapest for the three different components came into existence. Furthermore spectral acceleration (response spectra, SA) and RSR charts of the synthetic seismograms for the four different profiles were created. The PGA grid maps show that the maximal PGA values are situated at the eastern (Pest) part of the downtown, and their values are 50–200 cm/s2.

For the downtown of Budapest a special seismic risk map have been prepared. This special seismic risk map were created on the basis of the difference between the maximal amplitude frequencies of SA of synthetic seismograms and the building’s eigenfrequencies at every 0.1 km2 of the downtown. In order to determine the building’s eigenfrequencies microseismic noise measurement were performed at 6 different buildings in the downtown. The special seismic risk map shows that the buildings situated at the hilly western section of the downtown have higher seismic risk than the ones at the flat eastern part.

Keywords

deterministic seismic hazard computation Geographical Information System (GIS) hybrid technique seismic microzonation seismic risk 

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Copyright information

© Akadémiai Kiadó 2010

Authors and Affiliations

  1. 1.Geodetic DepartmentGeodetic and Geophysical Research Institute of the Hungarian Academy of SciencesSopronHungary
  2. 2.Generali Providencia Insurance Company IncorporatedBudapestHungary
  3. 3.Seismological DepartmentGeodetic and Geophysical Research Institute of the Hungarian Academy of SciencesBudapestHungary

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