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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:36 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Source, propagation and site effects: impact on mapping strong ground motion in Bucharest area
Authors:
M. Radulian1, I. Kuznetsov2, G.F. Panza3
Affiliation:
1 National Institute for Earth Physics, P.O. Box MG-2, 077125, Bucharest, ROMANIA
2 International Institute of Earthquake Prediction Theory and Mathematical Geophysics , Academy of Sciences of Russia, Warshavskoye, 79, Moscow, RUSSIA
3 Department of Earth Sciences – University of Trieste and The Abdus Salam International Center for Theoretical Physics – SAND Group, ITALY
E-mail
Keywords:
Vrancea earthquakes,mapping strong motion, Bucharest,
Abstract:
Achievements in the framework of the NATO SfP project 972266 focused on the impact of Vrancea earthquakes on the security of Bucharest urban area are presented. The problem of Bucharest city security to Vrancea earthquakes is discussed in terms of numerical modelling of seismic motion and intermediate term earthquake prediction. A hybrid numerical scheme developed by Fäh et al. (1990; 1993) for frequencies up to 1 Hz is applied for the realistic modelling of the seismic ground motion in Bucharest. The method combines the modal summation for the 1D bedrock model and the finite differences for the 2D local structure model. All the factors controlling the ground motion at the site are considered: source, propagation and site effects, respectively. The input data includes the recent records provided by the digital accelerometer network developed within the Romanian-German CRC461 cooperation programme and CALIXTO’99, VRANCEA’99, VRANCEA2001 experiments. The numerical simulation proves to be a powerful tool in mapping the strong ground motion for realistic structures, reproducing acceptably from engineering point of view the observations. A new model of the Vrancea earthquake scaling is obtained and implications for the determination of the seismic motion parameters are analyzed. The role of the focal mechanism and attenuation properties upon the amplitude and spectral content of the ground motion are outlined. CN algorithm is applied for predicting Vrancea earthquakes. Finally, implications for the disaster management strategy are discussed.
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