caa a22 4500 445846755 CHVBK 20180317145401.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10518-011-9315-x doi (NATIONALLICENCE)springer-10.1007/s10518-011-9315-x Estimation of topographical effects at Narni ridge (Central Italy): comparisons between experimental results and numerical modelling [Elektronische Daten] [S. Lovati, M. Bakavoli, M. Massa, G. Ferretti, F. Pacor, R. Paolucci, E. Haghshenas, M. Kamalian] In the present work the seismic site response of Narni ridge (Central Italy) is evaluated by comparing experimental results and numerical simulations. The inhabited village of Narni is located in central Apennines at the top of a steep massive limestone ridge. From March to September 2009 the site was instrumented with 10 weak-motion stations, 3 of which located at the base of the ridge and 7at the top. The velocimetric network recorded 642 events of ML up to 5.3 and hypocentral distance up to about 100 km. The great amount of data are related to the April 2009 L'Aquila sequence. The site response was analyzed using both reference (standard spectral ratio, SSR) and non reference spectral techniques (horizontal to vertical spectral ratio, HVSR). Moreover directional analyses were performed in order to evaluate the influence of the ridge orientation with respect to the selected source-site paths. In general the experimental results show amplification factors for frequencies between 4and5Hz for almost all stations installed along the crest. The SSR technique provides amplification factors up to 4.5 in a direction perpendicular to the main elongation of the ridge. The results obtained from the data analyses were used as a target for bidimensional and tridimensional numerical simulations, performed using a hybrid finite-boundary element method and a boundary element method for 2D and 3D modelling, respectively. In general, the results obtained through numerical simulation fit well the experimental data in terms of range of amplified frequencies, but they underestimate by a factor of about 2 the observed amplifications. Springer Science+Business Media B.V., 2011 Topographical effects nationallicence Spectral analyses nationallicence Direction analyses nationallicence Vertical amplification nationallicence Numerical modelling nationallicence Lovati S. Istituto Nazionale di Geofisica e Vulcanologia, sezione Milano-Pavia, Milano, Italy aut Bakavoli M. International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran aut Massa M. Istituto Nazionale di Geofisica e Vulcanologia, sezione Milano-Pavia, Milano, Italy aut Ferretti G. Università degli studi di Genova, Dip.Te.Ris., sezione de Geofisica, Genova, Italy aut Pacor F. Istituto Nazionale di Geofisica e Vulcanologia, sezione Milano-Pavia, Milano, Italy aut Paolucci R. Dipartimento di Ingegneria Strutturale, Politecnico di Milano, Milano, Italy aut Haghshenas E. International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran aut Kamalian M. International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran aut Bulletin of Earthquake Engineering Springer Netherlands 9/6(2011-12-01), 1987-2005 1570-761X 9:6<1987 2011 9 10518 https://doi.org/10.1007/s10518-011-9315-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10518-011-9315-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lovati S. Istituto Nazionale di Geofisica e Vulcanologia, sezione Milano-Pavia, Milano, Italy aut NATIONALLICENCE 700 1- Bakavoli M. International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran aut NATIONALLICENCE 700 1- Massa M. Istituto Nazionale di Geofisica e Vulcanologia, sezione Milano-Pavia, Milano, Italy aut NATIONALLICENCE 700 1- Ferretti G. Università degli studi di Genova, Dip.Te.Ris., sezione de Geofisica, Genova, Italy aut NATIONALLICENCE 700 1- Pacor F. Istituto Nazionale di Geofisica e Vulcanologia, sezione Milano-Pavia, Milano, Italy aut NATIONALLICENCE 700 1- Paolucci R. Dipartimento di Ingegneria Strutturale, Politecnico di Milano, Milano, Italy aut NATIONALLICENCE 700 1- Haghshenas E. International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran aut NATIONALLICENCE 700 1- Kamalian M. International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran aut NATIONALLICENCE 773 0- Bulletin of Earthquake Engineering Springer Netherlands 9/6(2011-12-01), 1987-2005 1570-761X 9:6<1987 2011 9 10518 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer