NDLI: Estimation of topographical effects at Narni ridge (Central Italy): comparisons between experimental results and numerical modelling

Content Provider	Springer Nature Link
Author	Lovati, S. Bakavoli, M. K. H. Massa, M. Ferretti, G. Pacor, F. Paolucci, R. Haghshenas, E. Kamalian, M.
Copyright Year	2011
Abstract	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 7 at 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 4 and 5 Hz 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.
Starting Page	1987
Ending Page	2005
Page Count	19
File Format	PDF
ISSN	1570761X
Journal	Bulletin of Earthquake Engineering
Volume Number	9
Issue Number	6
e-ISSN	15731456
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-10-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Topographical effects Spectral analyses Direction analyses Vertical amplification Numerical modelling Geophysics/Geodesy Hydrogeology Civil Engineering Structural Geology Environmental Engineering/Biotechnology Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geophysics Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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