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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:41 |
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Conference: Bucharest University Faculty of Physics 2005 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Applicability of Deterministic Methods in Seismic Site Effects Modeling
Authors:
C.O.Cioflan 1, M.Radulian 1, C.Ciucu 2 , B.F.Apostol 1
Affiliation:
1 – National Institute for Earth Physics, Bucharest, Romania
2 – Faculty of Physics, University of Bucharest
E-mail
Keywords:
site effects , deterministic modelling, synthetic seismograms
Abstract:
The up-to-date information related to local geological structure in the Bucharest urban area has been integrated in complex analyses of the seismic ground motion simulation using deterministic procedures. The data recorded for the Vrancea intermediate-depth large earthquakes are supplemented with synthetic computations all over the city area. The hybrid method with a double-couple seismic source approximation and a relatively simple regional and local structure models allows a satisfactory reproducing of the strong motion records in the frequency domain (0.05-1)Hz . The new geological information and a deterministic analytical method which combine the modal summation technique, applied to model the seismic wave propagation between the seismic source and the studied sites, with the mode coupling approach used to model the seismic wave propagation through the local sedimentary structure of the target site, allows to extend the modelling to higher frequencies of earthquake engineering interest. The results of these studies (synthetic time histories of the ground motion parameters, absolute and relative response spectra etc) for the last 3 Vrancea strong events (August31,1986 Mw=7.1; May30,1990 Mw=6.9 and October27,2004 Mw=6.0) can complete the strong motion database used for the microzonation purposes. Implications and integration of the deterministic results into the urban planning and disaster management strategies are also discussed.
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