Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item:

Authors: Lovati, S.*
Bakavoli, M.*
Massa, M.*
Ferretti, G.*
Pacor, F.*
Paolucci, R.*
Haghshenas, E.*
Kamalian, M.*
Title: Estimation of topographical effects at Narni ridge (Central Italy): comparisons between experimental results and numerical modelling
Title of journal: Bulletin Earthquake Engineering
Series/Report no.: /9 (2011)
Issue Date: Aug-2011
DOI: 10.1007/s10518-011-9315-x
Keywords: Topographical effects · Spectral analyses · Direction analyses · Vertical amplification · Numerical modelling
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 sourcesite paths. In general the experimental results show amplification factors for frequencies between 4 and 5Hz 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.
Appears in Collections:04.06.99. General or miscellaneous
Papers Published / Papers in press

Files in This Item:

File SizeFormatVisibility
Lovati_et_al_BEE.pdf6.71 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Share this record




Stumble it!



Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA