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  • 1
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    A seismic source zone model for the seismic hazard assessment of the Italian territory (2008)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: We designed a new seismic source model for Italy to be used as an input for country-wide probabilistic seismic hazard assessment (PSHA) in the frame of the compilation of a new national reference map. We started off by reviewing existing models available for Italy and for other European countries, then discussed the main open issues in the current practice of seismogenic zoning. The new model, termed ZS9, is largely based on data collected in the past 10 years, including historical earthquakes and instrumental seismicity, active faults and their seismogenic potential, and seismotectonic evidence from recent earthquakes. This information allowed us to propose new interpretations for poorly understood areas where the new data are in conflict with assumptions made in designing the previous and widely used model ZS4. ZS9 is made out of 36 zones where earthquakes with Mw 〉= 5 are expected. It also assumes that earthquakes with Mw up to 5 may occur anywhere outside the seismogenic zones, although the associated probability is rather low. Special care was taken to ensure that each zone sampled a large enough number of earthquakes so that we could compute reliable earthquake production rates. Although it was drawn following criteria that are standard practice in PSHA, ZS9 is also innovative in that every zone is characterised also by its mean seismogenic depth (the depth of the crustal volume that will presumably release future earthquakes) and predominant focal mechanism (their most likely rupture mechanism). These properties were determined using instrumental data, and only in a limited number of cases we resorted to geologic constraints and expert judgment to cope with lack of data or conflicting indications. These attributes allow ZS9 to be used with more accurate regionalized depth-dependent attenuation relations, and are ultimately expected to increase significantly the reliability of seismic hazard estimates.
    Description: Published
    Description: 85-108
    Description: 3.2. Tettonica attiva
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: JCR Journal
    Description: reserved
    Keywords: Seismotectonics ; Seismic source zone model ; Seismic hazard ; Italy ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk ; 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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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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  • 3
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    Valutazione standard (10%, 475 anni) di amax (16mo, 50mo e 84mo percentile) per le isole rimaste escluse nella fase di redazione di MPS04. Progetto INV-DPC, Deliverable D1 (2007)
    Details
    Publication Date: 2017-04-04
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Published
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: open
    Keywords: Seismic hazard ; Italy ; 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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  • 4
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    Suggerimenti per l’adeguamento delle azioni sismiche di progetto delle norme. Progetto INGV-DPC S1, Deliverable D21 (2007)
    Details
    Publication Date: 2017-04-04
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Published
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: open
    Keywords: Seismic hazard ; Seismic Risk ; Building code ; Italy ; 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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  • 5
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    Preliminary study on the impact of the introduction of an updated seismic hazard model for Italy (2007)
    Taylor & Francis
    Details
    Publication Date: 2017-04-04
    Description: A new hazard model for Italy has recently been proposed; hazard maps have been produced for various return periods, allowing the values of peak ground acceleration (PGA) and spectral accelerations for response periods up to 2 s to be interpolated for each of the 8,101 Italian municipalities. The new model allows for a more refined definition of the hazard in each municipality as compared to the current use of a fixed spectral shape anchored to upper bound 475-year PGA values and scaling factors for different return periods. The aim of this work is to investigate, in a preliminary fashion, the implications that the adoption of the new return-period dependent hazard maps would have on design and assessment of structures. To this end, the seismic performance of reinforced concrete frames of varying height is evaluated assuming they were located in each of the 8,101 municipalities in Italy and the results obtained with the current and the new hazard model are compared. The new model is shown to result in lower seismic risk in the majority of the municipalities.
    Description: Published
    Description: 89-118
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: JCR Journal
    Description: reserved
    Keywords: Seismic hazard ; Response Spectra ; Vulnerability assessment ; Risk assessment ; Reinforced concrete buildings ; Italy ; 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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    Mappe di pericolosità sismica in termini di intensità macrosismica utilizzando lo stesso impianto metodologico di MPS04. Progetto INGV-DPC S1, Deliverable D7. (2007)
    Details
    Publication Date: 2017-04-04
    Description: A seismic hazard map, with 10% probability of exceedance in 50 years in terms of macroseismic intensity, is proposed for the Italian territory. The input elements used to evaluate the seismic hazard are: the seismogenic zoning ZS9, the earthquake catalogue CPTI04, the historical and statistical completeness. These elements are those used in MPS04 (Gruppo di Lavoro MPS, 2004). Two new intensity attenuation models were used: 1) a set of regional relationships derived from a previous cubic model (Berardi et al., 1993) which has been recalibrated (Gómez Capera, 2006); 2) a relationship obtained with a new approach (Pasolini et al., 2006). The intensity attenuation models were obtained using the macroseismic intensity database, which was used for compiling CPTI04. The computer code adopted to evaluate the seismic hazard, with the elements cited above, is SeisRisk III, which has been modified to be used with macroseismic intensity data, i.e. allowing to consider the normal distribution of the residuals. A logic tree approach has been used to explore some possible alternatives of epistemic character.
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Published
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: open
    Keywords: seismic hazard ; macroseismic data ; intensity attenuation ; Italy ; 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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  • 7
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    Gli effetti dell’introduzione della nuova mappa di pericolosità sulla valutazione del rischio sismico in Italia. (2007)
    Details
    Publication Date: 2017-04-04
    Description: L’introduzione di una versione aggiornata della mappa di pericolosità sismica, definita per diversi periodi di ritorno e per svariati valori di ordinate spettrali, porta inevitabilmente a dei cambiamenti sul livello di rischio sismico del costruito italiano. Poiché la relazione tra domanda e capacità non è lineare per tutto il range di periodi di vibrazione strutturale, è necessario valutare il cambiamento del livello di rischio sismico calcolando esplicitamente la vulnerabilità sismica di strutture esistenti con diversi periodi di vibrazione, per diversi stati limite e considerando sia la nuova che la precedente definizione di pericolosità. Nel presente lavoro è stato eseguito un primo studio degli effetti che l’introduzione di mappe aggiornate della pericolosità sismica potrebbe avere sulla valutazione dei livelli di rischio sismico nel territorio italiano. Le caratteristiche generali del costruito sono state ricavate dai dati del 14° Censimento Generale della Popolazione e delle Abitazioni (ISTAT 2001), mentre una procedura probabilistica di valutazione sismica per edifici esistenti a scala urbana è stata impiegata per stimare la capacità. Sono stati considerati tutti i tre stati limite prescritti dall’Ordinanza (danno lieve, danno severo, collasso) in corrispondenza dei rispettivi valori di domanda, così come il cambiamento delle forme spettrali in funzione della localizzazione e del periodo di ritorno. I risultati dimostrano che la nuova mappa di pericolosità sismica porta a dei livelli di rischio sismico più realistici e meno allarmanti, rendendo leggermente meno gravoso, anche se non privo di problematiche, il panorama attuale di rischio in Italia.
    Description: Published
    Description: Pisa, Italy
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: open
    Keywords: Seismic hazard ; seismic risk ; Spectral ordinates ; Vulnerability ; Italy ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 8
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    The Estimation of Earthquake Parameters in Europe by Using Macroseismic Data: Testing the MEEP Program (2008)
    Details
    Publication Date: 2017-04-04
    Description: In the frame of the NA-4 module of the European project NERIES, a specific task is devoted to the determination of earthquakes parameters from macroseismic data. On this regard, a new methodology, implemented in the program MEEP, has been developed by Musson et al. (see relevant presentation in this session). Here we present and discuss some tests performed by using the MEEP program in order to contribute to the setting up of the code and to validate the methodology itself. To this purpose, a set of earthquakes occurred in different regions of Europe and with different ranges of magnitude have been selected. In particular, the main aspects investigated here are: •reliability of estimates of epicentre location, magnitude and hypocentral depth compared with instrumental determinations; •comparison with epicentral parameters derived by using other methods based on macroseismic data; •sensitivity of the methodology to number and geographic distribution of available intensity data points (IDPs); •sensitivity to the calibration parameters requested by the program. Results of this analysis suggested some modifications of the program
    Description: Published
    Description: Hersonissos, Creta island, Greece
    Description: 5.1. TTC - Banche dati e metodi macrosismici
    Description: open
    Keywords: earthquake parameters ; macroseismic ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Abstract
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  • 9
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    Application of the Bakun Wentworth's Method for the Macroseismic Estimation of Parameters of Italian Earthquakes (2008)
    Details
    Publication Date: 2017-04-04
    Description: The methodology proposed by Bakun and Wentworth (1997, Estimating earthquake location and magnitude from seismic intensity data, Bull. Seism. Soc. Am., 87, 1502-1521; hereinafter B&W) and calibrated with Italian data by Gomez Capera AA, D’Amico V, Meletti C (2008, Calibrating the Bakun-Wentworth’s method for the macroseismic estimation of earthquake parameters in Italy, this conference) was applied to the recently released macroseismic database of Italian earthquakes (DBMI07; http://emidius.mi.ingv.it/DBMI07). The database contains about 83000 intensity data points for 1430 earthquakes. In the time-interval 1900-2006, for the greater part of the earthquakes the instrumental determination (epicentral coordinates and magnitude) is available. Thus, the Bakun and Wentworth method (B&W) was applied to a large set of Italian earthquakes and the results compared with those obtained adopting the Boxer approach (Gasperini, P., Bernardini, F., Valensise, G., Boschi, E.,1999, Defining seismogenic sources from historical earthquake felt reports, Bull. Seismol. Soc. Am. 89, 94-110); epicentral determinations by both methods were then compared with the instrumental parameters.
    Description: Published
    Description: Hersonissos, Creta island, Greece
    Description: 5.1. TTC - Banche dati e metodi macrosismici
    Description: open
    Keywords: earthquake parameters ; macroseismic ; magnitude from macroseismic data ; Bakun and Wentworth method ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Abstract
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  • 10
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    La pericolosità sismica in Italia e nell’area dello stretto di Messina (2008)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: Le stime probabilistiche della pericolosità sismica sono alla base di qualsiasi politica di prevenzione dei danni da terremoto, sia perché utilizzate per definire le aree prioritarie per interventi di riduzione del rischio sismico, sia perché su di esse si basa la normativa tecnica per le costruzioni. Eppure, nonostante la loro importanza, non esiste una procedura standard universalmente riconosciuta per definire con precisione la pericolosità sismica di un’area.
    Description: Published
    Description: Reggio Calabria, Italy
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: open
    Keywords: Seismic hazard ; Italy ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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