caa a22 4500 475813375 CHVBK 20180406123803.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/s000240050002 doi (NATIONALLICENCE)springer-10.1007/s000240050002 About the Efficiency of Numerical 1-D and 2-D Modelling of Site Effects in Basin Structures [Elektronische Daten] [J. Riepl, J. Zahradník, V. Plicka, P.-Y. Bard] —In the present study we compare results obtained from experimental estimates of local site amplification effects with those from numerical modelling using four different techniques. We benefit from an extremely precise knowledge of the near-surface structure and experimental estimates of the local amplification factors which are determined from seismic weak-motion data recorded by a dense array across a sedimentary basin at a European test-site in Northern Greece. The possibilities and limitations of the different modelling techniques (a 1-D technique, and three 2-D techniques) to model the effects of local amplification effects are tested. Amplifications calculated by the numerical techniques are only qualitatively compared with observed data from experimental studies in the time domain and directly in the frequency domain.¶As a result we conclude that, in the case of a complex subsurface geometry, 1-D modelling underestimates the amplification patterns in terms of absolute amplification level, and cannot correctly account for resonant frequencies, at least for modes higher than the fundamental mode. If a more realistic incident wave field than just a plane wave is taken into account, 2-D modelling reveals the fundamental frequency and shows adequate amplifications not only at the fundamental frequency but also at higher frequencies. The general trend of the amplifications at the lowest frequencies is well determined by the 2-D numerical modelling, and can therefore supply information for seismic risk analysis. Birkhäuser Verlag Basel,, 2000 Key Words: Site effects, seismic hazard analysis, numerical 1-D and 2-D modelling, reflectivity method, Aki-Larner method, finite difference modelling nationallicence Riepl J. On leave from IPSN-DPRE-SERGD-BERSSIN, BP 6, 92265 Fontenay-aux-Roses Cedex, France., FR aut Zahradník J. Dept. of Geophysics, Charles University, V Holešovickách 2, 180000 Praha 8, Czech Republic., CZ aut Plicka V. Dept. of Geophysics, Charles University, V Holešovickách 2, 180000 Praha 8, Czech Republic., CZ aut Bard P.-Y LGIT-IRIGM, BP 53 X, 38041 Grenoble Cedex, France., FR aut https://doi.org/10.1007/s000240050002 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s000240050002 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Riepl J. On leave from IPSN-DPRE-SERGD-BERSSIN, BP 6, 92265 Fontenay-aux-Roses Cedex, France., FR aut NATIONALLICENCE 700 1- Zahradník J. Dept. of Geophysics, Charles University, V Holešovickách 2, 180000 Praha 8, Czech Republic., CZ aut NATIONALLICENCE 700 1- Plicka V. Dept. of Geophysics, Charles University, V Holešovickách 2, 180000 Praha 8, Czech Republic., CZ aut NATIONALLICENCE 700 1- Bard P.-Y LGIT-IRIGM, BP 53 X, 38041 Grenoble Cedex, France., FR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer