Site response analyses for complex geological and morphological conditions: relevant case-histories from 3rd level seism
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Site response analyses for complex geological and morphological conditions: relevant case‑histories from 3rd level seismic microzonation in Central Italy A. Pagliaroli1 · F. Pergalani2 · A. Ciancimino3 · A. Chiaradonna4,5 · M. Compagnoni2 · F. de Silva4,5 · S. Foti3 · S. Giallini1,5 · G. Lanzo6 · F. Lombardi2 · L. Luzi7 · L. Macerola8 · M. Nocentini5 · A. Pizzi8 · M. Tallini8 · C. Teramo9 Received: 18 September 2018 / Accepted: 1 April 2019 © Springer Nature B.V. 2019
Abstract The paper presents the results of 5 case studies on complex site effects selected within the project for the level 3 seismic microzonation of several municipalities of Central Italy damaged by the 2016 seismic sequence. The case studies are characterized by different geological and morphological configurations: Monte San Martino is located along a hill slope, Montedinove and Arquata del Tronto villages are located at ridge top whereas Capitignano and Norcia lie in correspondence of sediment-filled valleys. Peculiarities of the sites are constituted by the presence of weathered/jointed rock mass, fault zone, shear wave velocity inversion, complex surface and buried morphologies. These factors make the definition of the subsoil model and the evaluation of the local response particularly complex and difficult to ascertain. For each site, after the discussion of the subsoil model, the results of site response numerical analyses are presented in terms of amplification factors and acceleration response spectra in selected points. The physical phenomena governing the site response have also been investigated at each site by comparing 1D and 2D numerical analyses. Implications are deduced for seismic microzonation studies in similar geological and morphological conditions. Keywords Seismic microzonation · Amplification factors · Response spectra · Numerical analyses · Complex geological and morphological conditions
1 Introduction Seismic Microzonation studies of level 3 (i.e., according to Working Group ICMS 2008 studies based on quantitative assessment of site effects by means of numerical analyses) were carried out for the reconstruction of several municipalities in Central Italy struck by the 2016 seismic events. The sequence started with the Mw 6.0 earthquake on August 24, 2016, followed by the Mw 5.9 on 26 October and the Mw 6.5 on 30 October * A. Pagliaroli [email protected] Extended author information available on the last page of the article
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Bulletin of Earthquake Engineering
Fig. 1 Selected sites presented in the paper and sketch of the corresponding geological/morphological configurations
events (Chiaraluce et al. 2017). The studies were executed by professionals (mainly geologists and geotechnical engineers) with the scientific supervision and support of the Center for Seismic Microzonation and its applications (CentroMS, https://www. centromicrozonazionesismica.it/en/) constituted by several university departments and research institutes. In particular, the CentroMS has taken care of s
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