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  • 1
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    Seismic hazard assessment in terms of macroseismic intensity for the Italian area (2010)
    Details
    Publication Date: 2017-04-04
    Description: A seismic hazard map, in terms of macro seismic intensity with 10% probability of exceedance in 50 years, is proposed for the Italian territory. The input elements used to evaluate the seismic hazard are: the seismogenic zoning ZS9 (Meletti et al., 2007), the earthquake catalogue CPTI04 (Gruppo di lavoro CPTI04, 2004) and intensity attenuation relationships. The first two elements and the historical and statistical completeness of the catalogue are those used in the national seismic hazard map for Italy MPS04 (Gruppo di Lavoro MPS, 2004). Two intensity attenuation models are used: 1) one national relationship obtained with a new approach by Pasolini et al. (2006) and a relationship for the Etna volcanic zone proposed by Azzaro et al. (2006) 2) a set of regional relationships derived from a previous cubic model (Berardi et al., 1993) which is recalibrated in the present study using the macro seismic intensity database DBMI04 (Stucchi et al., 2007), which was used for compiling CPTI04. The computer code adopted to evaluate the seismic hazard, with the elements cited above, is SeisRisk III (Bender and Perkins, 1987), which has been modified within this study to incorporate the aleatory variability of the ground motion (macroseismic intensity). A logic-tree framework allowed to explore some possible alternatives of epistemic character. The seismic hazard map obtained in terms of intensity was subsequently transformed into PGA by means of a linear relation between intensity and PGA, in order to compare it with the recently national seismic hazard map MPS04.
    Description: Istituto Nazionale di Geofisica e Vulcanologia, sezione di Milano-Pavia
    Description: Published
    Description: open
    Keywords: probabulistic seismic hazard assessment ; intensity attenuation ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 2
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    Pericolosità sismica, normativa e zone sismiche nell'Aquilano (2010)
    Details
    Publication Date: 2012-02-03
    Description: Published
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: open
    Keywords: Pericolosità sismica ; Abruzzo ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: web product
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  • 3
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    Seismic Hazard Assessment (2003–2009) for the Italian Building Code (2012)
    Seismological Society of America
    Details
    Publication Date: 2017-04-04
    Description: This paper describes the probabilistic assessment of seismic hazard (PSHA) of Italy in view of the building codes from 2003 to 2009. A code was issued in 2003 as Prime Minister Ordinance, requiring that a PSHA for updating the seismic zoning would be performed in one year, in terms of horizontal peak ground acceleration (PGA) with 10% probability of exceedance in 50 years, on hard ground. For the first time in Italy a working group, established by Istituto Nazionale di Geofisica e Vulcanologia (INGV), adopted a logic-tree approach to model the epistemic uncertainty in: the completeness of the earthquake catalog, the assessment of the seismicity rates and Mmax, and the ground motion prediction equations. The seismic hazard has been computed over a grid of more than 16,000 points for the median value (50th percentile), 84th and 16th percentiles of the 16 branches of the logic tree. Using the same input model, PGA values and spectral accelerations for 10 spectral periods were computed for 9 different probabilities of exceedance in 50 years. This wealth of data made it possible to base the design spectra of a new building code on point hazard data instead of being related to just four zones. The 2009, Mw 6.3 L’Aquila earthquake has led many to attempt to test the reliability of this study. In this paper we analyze suggestions coming from that event and conclude that significant changes to the design spectra are not be recommended based just on evidence from the L’Aquila earthquake.
    Description: Published
    Description: 1885–1911
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: JCR Journal
    Description: restricted
    Keywords: seismic hazard ; italy ; building code ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Seismic hazard in the Po Plain and the 2012 Emilia earthquakes (2012)
    Details
    Publication Date: 2017-04-04
    Description: The Emilia earthquakes of May 20, 2012 (ML 5.9, INGV; MW 6.11, http://www.bo.ingv.it/RCMT/) and May 29, 2012 (ML 5.8, INGV; MW 5.96, http://www.bo.ingv.it/RCMT/) struck an area that in the national reference seismic hazard model [MPS04; http://zonesismiche.mi.ingv.it, and Stucchi et al. 2011] is characterized by expected horizontal peak ground acceleration (PGA) with a 10% probability of exceedance in 50 years that ranges between 0.10 g and 0.15 g (Figure 1), which is a medium level of seismic hazard in Italy. The strong impact of the earthquakes on a region that is not included among the most hazardous areas of Italy, and the ground motion data recorded by accelerometric networks, have given the impression to the population and the media that the current seismic hazard map is not correct, and thus needs to be updated. Since the MPS04 seismic hazard model was adopted by the current Italian building code [Norme Tecniche per le Costruzioni 2008, hereafter termed NTC08; http://www.cslp. it/cslp/] as the basis to define seismic action (the design spectra), any modification to the seismic hazard model would also affect the building code. The aim of this paper is to briefly present the data that support the seismic hazard model in the area, and to perform some comparisons between recorded ground motion with seismic hazard estimates and design spectra. All of the comparisons presented in this study are for the horizontal components only, as the Italian hazard model did not perform any estimates for the vertical component.
    Description: Published
    Description: 623-629
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: JCR Journal
    Description: open
    Keywords: 2012 Emilia earthquakes ; Seismic hazard ; Ground-motion recordings ; Design code spectra ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    I terremoti del maggio 2012 e la pericolosità sismica dell’area: che cosa è stato sottostimato? (2013)
    IUSS Press
    Details
    Publication Date: 2017-04-04
    Description: Analogamente al caso del terremoto di L’Aquila 2009, immediatamente dopo il terremoto dello scorso maggio 2012 in Emilia, stampa, funzionari pubblici e ricercatori dichiararono che la pericolosità sismica della zona danneggiata, e probabilmente anche il rischio sismico, sono stati sottostimati dalla valutazione probabilistica della pericolosità sismica (PSHA) di riferimento per il territorio Italiano e, di conseguenza, dalle norme tecniche basate su quella valutazione. Una delle principali problematiche emerse è legata al fatto che i valori di PGA registrati vicino a Mirandola erano superiori a quelli “previsti” dalla valutazione di pericolosità sismica. Questo articolo evidenzia alcune delle critiche, mostrando come nei sopraccitati confronti non si considerano le differenze fra le condizioni locali delle stazioni di registrazione e quelle con cui la PSHA è stata calcolata. In aggiunta, l’articolo ricorda che il confronto dei parametri di un singolo evento con la predizione probabilistica di tali parametri ha scarso significato. La causa principale del danno deve essere ricercata nel fatto che le norme di progetto per le costruzioni non sono state implementate nell’area danneggiata prima del 2003 e, per alcuni aspetti, neanche dopo. Perciò quello che è stato realmente sottostimato, non in ambito scientifico, è la necessità di ridurre il rischio sismico.
    Description: Published
    Description: 63-73
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: N/A or not JCR
    Description: restricted
    Keywords: Pericolosità sismica ; Emilia 2012 ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    The SHARE European Earthquake Catalogue (SHEEC) 1000-1899 (2012)
    Springer Science+Business Media B.V.
    Details
    Publication Date: 2022-09-08
    Description: In the frame of the European Commission project “Seismic Hazard Harmonization in Europe” (SHARE), aiming at harmonizing seismic hazard at a European scale, the compilation of a homogeneous, European parametric earthquake catalogue was planned. The goal was to be achieved by considering the most updated historical dataset and assessing homogenous magnitudes, with support from several institutions. This paper describes the SHARE European Earthquake Catalogue (SHEEC), which covers the time-window 1000-1899. It strongly relies on the experience of the European Commission project “Network of Research Infrastructures for European Seismology” (NERIES), a module of which was dedicated to create the European “Archive of Historical Earthquake Data” (AHEAD) and to establish methodologies to homogenously derive earthquake parameters from macroseismic data. AHEAD has supplied the final earthquake list, obtained after sorting duplications out and eliminating many fake events, and the most updated historical dataset. Macroseismic data points (MDPs) provided by AHEAD have been processed with updated, repeatable procedures, regionally calibrated against a set of recent, instrumental earthquakes, to obtain earthquake parameters. From the same data, a set of epicentral intensity-to-magnitude relations has been derived, with the aim of providing another set of homogeneous Mw estimates. Then, a strategy focussed on maximizing the homogeneity of the final epicentral location and Mw, has been adopted. Special care has been devoted also to supply location and Mw uncertainty. The paper focuses on the procedure adopted for the compilation of SHEEC and briefly comments on the achieved results.
    Description: EC-Research Framework programme FP7, Seismic Hazard Harmonization in Europe, Grant Agreement No. 226769
    Description: Published
    Description: 523-544
    Description: 5.1. TTC - Banche dati e metodi macrosismici
    Description: JCR Journal
    Description: open
    Keywords: earthquake catalogue ; Europe ; earthquake parameters ; magnitude ; parameters uncertainty ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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