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Martinelli, Francesco
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Martinelli, Francesco
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francesco.martinelli@ingv.it
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staff
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16245619900
22 results
Now showing 1 - 10 of 22
- PublicationOpen AccessThe 2016 Italian seismic hazard model(2017-01-09)
; ; ; ; ; ; ; ; ; ; ;MPS16 Working Group; ; ; ; ; ; ; ; ; The Italian reference seismic hazard model was released in 2004, but it has been adopted for the definition of seismic zones in 2006 and for building code only in 2009. At the beginning of 2015 the Seismic Hazard Center (CPS) of INGV was commissioned to coordinate the national scientific community with the aim of elaborating a new reference seismic hazard model, mainly finalized to the update of seismic code. The CPS designed a roadmap to release within 2 years a significantly renewed model, with regard both to the updated input elements and to the strategies to follow, in order to obtain a shared and largely accepted PSHA. The main requirements of the model were discussed in meetings with the experts on earthquake engineering. A public call was opened according to a transparent procedure; we received 24 proposals from many national institutions. The activities were organized in 6 tasks: project coordination, input data, seismicity models, ground motion prediction equations, computation and rendering, validation. In the first phase, the working groups of each task worked separately; in the second phase of the project they collaborated to release a final model. During the project, many scientific aspects were carefully considered, as in many other seismic hazard projects: the use of a declustered catalogue versus a non declustered one, the adoption of the logic-tree approach instead of an ensemble modeling, the definition of objective strategies to assign the weight to each single model, and so on.321 561 - PublicationOpen AccessAccess to the Volcano Dynamics Computational Centre at INGV Pisa: Virtual Access(2021)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Horizon 2020 Project ID: 731070 Duration: From 2018-02-01 to 2021-11-30 Funded under: H2020-EU.1.4.1.2. – Integrating and opening existing national and regional research infrastructures of European interest EUROVOLC is Coordinated by the Icelandic Meteorological Office. Project Coordinator: Dr. Kristín S. Vogfjörd.93 39 - PublicationRestrictedA WebGIS Application for Rendering Seismic Hazard Data in Italy(2008-01)
; ; ;Martinelli, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; In 2004, on behalf of the Department of Civil Protection (DPC—Dipartimento della Protezione Civile), the Istituto Nazionale di Geofisica e Vulcanologia (INGV) released a new Italian seismic hazard map. The entire scientific process was public and transparent: an international panel of experts conducted a peer review while the work was in progress, and all the input data, the final output, and the technical documentation was published. The details of the entire process are available on a dedicated Web site (http://zonesismiche.mi.ingv.it). Following the publication of the reference map, the DPC financed the S1 project to produce a set of additional elaborations that would better describe the Italian seismic hazard. This resulted in a set of maps expressed in terms of PGA and Sa (spectral accelerations), both evaluated for different probabilities of exceedance. Finally, the overall information, more than a “set of maps,” can be considered the realization of what can be defined as a complete seismic hazard model. One of the aims of the S1 project is the dissemination of the data through the Web (http://esse1.mi.ingv.it). To evaluate the state of the art in disseminating this type of data we conducted an overview of the Web sites of earthquake-prone countries,and in several cases we experienced difficulties and slowness in finding seismic hazard information for a specific area. Our goal was to provide a tool with a combined high level of interactivity and ease of use. Recognizing the need for a Web application that would enable users to intuitively and interactively locate the area of interest and show pertinent data in various formats, we decided to develop a dedicated Web interface.289 61 - PublicationOpen AccessProbabilistic seismic hazard assessment in the high-risk area of south-eastern Sicily (Italy)(2012)
; ; ; ;D'Amico, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Martinelli, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; ; A probabilistic seismic hazard analysis (PSHA) was carried out for the SE sector of Sicily, an area characterized by highest levels of seismic hazard in Italy and high exposure, both in terms of cultural heritage and of critical industrial facilities. Compared to the Italian reference PSH map (MPS04), this study is based on most updated information about regional seismic sources and ground-motion attenuation. Epistemic uncertainties associated with the input elements of the computational model were taken into account following a logic-tree approach. Special care was devoted to define the regional source zones model by considering four alternative models, which share the zones defining the boundary conditions of the study area but differ in the seismotectonic characterization of SE Sicily. Seismic hazard was assessed in terms of PGA, PGV, acceleration and displacement elastic response spectra on rock for four return periods (30, 50, 475, 975 years). A disaggregation analysis was then performed for some sites of interest. Results confirm the very high hazard of the area, with expected values of PGA (at 10% probability of exceedance in 50 years) slightly higher than the reference MPS04 map. Strong differences emerge instead between the acceleration response spectra of this study and the reference ones, for the longest return periods.577 323 - ProductOpen AccessCrisis for Web(2010)
; ; ;Martinelli, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; 168 137 - PublicationOpen AccessThe new Italian seismic hazard model(2017-11)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; In 2015, the Seismic Hazard Centre (CPS) of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) was commissioned to engage and coordinate the national community with the aim of elaborating a new reference seismic hazard model, which is expected to be released in mid 2018. CPS outlined a roadmap to describe the main features of this complex endeavour, including the different scientific tasks, milestones and timelines. The scientific tasks focus their work on i) improving the quality and the accuracy of the input data (e.g. historical seismic catalogue, seismotectonic zonation, etc.); ii) building new earthquake rate models based on these new input data, iii) selecting the most proper ground motion prediction equations, iv) testing the overall seismic hazard model as well as each component; v) combining the results of the statistical testing phase and the outcome of an expert's elicitation session to assign a weight to each component of the final seismic hazard model. The new seismic hazard model is based on an innovative coherent probabilistic framework, which allows a proper description of the aleatory variability and epistemic uncertainty, and the validation of the seismic hazard model. Here, we describe the progresses made up to now, the comparison between the new and the official national model, and finally we discuss the scientific aspects that have the most significant impact on the new picture of PSHA in Italy.276 311 - PublicationOpen AccessHomogeneous determination of maximum magnitude(2010-11-30)
; ; ; ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;D'Amico, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Martinelli, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; ; This deliverable represents the result of the activities performed by a working group at INGV. The main object of the Task 3.5 is defined in the Description of Work. This task will produce a homogeneous assessment (possibly multiple models) of the distribution of the expected Maximum Magnitude for earthquakes expected in various tectonic provinces of Europe, to serve as input for the computation and validation of seismic hazard. This goal will be achieved by combining input from earthquake catalogues, regional strain rates, knowledge of active faults and seismogenic zones, as well as the definition of the seismic source zones. As stated above, the maximum magnitude (Mmax) has to be derived by the combination of several products of the Work Package 3. The deadline of the other deliverables is contemporary or subsequent to the scheduled release of the Mmax map; this means that at the moment it is not possible to provide a final map, but only to describe the preliminary work and the delineated approach for getting the final version of the deliverable. In fact the determination of Mmax has to be based on an earthquake catalog and on a seismic source zones (SSZs) model. At the 18-months deadline (the deadline for Deliverable 3.3) the catalog is not yet released in a proper way for the aim of this task and the seismic source zones model is available in a preliminary release. According to the temporal alignment of the deliverables, the SHARE Management Committee decided in the 4th teleconference meeting that an outline of the methods to be used in the PSHA including a review of state-of-the-art Mmax determination practices shall be presented including preliminary examples. This first version is presented here. With both, the final earthquake catalog and source zones models available (D3.1, D3.2 and D3.4), a final version will be released.319 382 - PublicationRestrictedCRISIS2008: A Flexible Tool to Perform Probabilistic Seismic Hazard Assessment(2013-05)
; ; ; ; ;Ordaz, M. ;Martinelli, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;D'Amico, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;; ; In the frame of the Italian research project INGV-DPC S2 (http://nuovoprogettoesse2.stru.polimi.it/), funded by the Dipartimento della Protezione Civile (DPC; National Civil Protection Department) within the agreement 2007-2009, a tool for probabilistic seismic hazard assessment (PSHA) was developed. The main goal of the project was to provide a flexible computational tool for PSHA; the requirements considered essential for the success of the project included: • ability to handle both stationary and non-stationary earthquake time-occurrence models; • ability to use ground-motion prediction models that are not parametric equations but probabilistic "footprints" of the intensities generated by earthquakes of known magnitude and focal characteristics. Usually, these footprints are results of ground motion simulations. Some commonly used programs (e.g., FRISK, by McGuire, 1978; SEISRISK III, by Bender and Perkins, 1987) and more recent and state-of-the-art tools (e.g. OpenSHA, by Field et al., 2003, http://www.opensha.org; OpenQuake, http://openquake.org) for PSHA were analyzed. It was decided to focus on CRISIS2007, which was already a mature and well known application (e.g., Kalyan Kumar and Dodagoudar, 2011; Teraphan et al., 2011; D’Amico et al., 2012; see also http://ecapra.org/CRISIS-2007), but also suitable for additional development and evolution since its source code is freely available on request. The computational tool resulted in an extensive redesign and renovation of the previous CRISIS2007 version. CRISIS is a computer program for PSHA, originally developed in the late 1980's using Fortran as programming language (Ordaz, 1991). In this format, still without a graphical user interface (GUI), it was distributed as part of SEISAN tools (Ottemöller et al., 2011). Ten years later, a GUI was constructed, generating what was called CRISIS99 (Ordaz, 1999). In this version, all the graphic features were written in Visual Basic, but the computation engine remained a Fortran dynamic link library. The reason for the use of mixed-language programming was that computations in Visual Basic were extremely slow. Around 2007 the program was upgraded, in view of the advantages offered by the object-oriented technologies. An object-oriented programming language was required and the natural choice was Visual Basic.Net. In the new version (called CRISIS2007), both the GUI and the computation engine were written in the same language. Finally, in the frame of the mentioned S2 project, starting from 2008, the program was split into two logical layers: core (CRISIS Core Library) and presentation (CRISIS2008). In addition, a new presentation layer was developed for accessing the same functionalities via Web (CRISISWeb). It is worth noting that CRISIS has been mainly written by people that are, at the same time, PSHA practitioners. Therefore, the development loop has been relatively short, and most of the modifications and improvements have been made to satisfy the needs of the developers themselves.1153 150 - PublicationOpen AccessL’applicazione web AutoRate per ildeclustering, la stima di completezzadi un catalogo e di tassi di sismicitàDuring the process for assessing seismic hazard there are some recurring operations which can be automated, which are about analysing the input data elements. The recurring operations are based on standard procedures and well known algorithms, and are performed a number of times in the range of tens, or even hundreds. It is therefore important to guarantee the correctness of the elaborations, and to reduce the human intervention which is always a potential source of errors. Specifically, we identified the following operations to be automated: the declustering of a catalog, the estimate of the catalogue completeness, the estimation of seismicity rates of source areas according to the Gutenberg-Richter distribution (G-R; [Gutenberg & Richter, 1944]). To perform the above operations, we developed a web application, AutoRate. The application allows to use databases (including geographical databases) shared between the users, to have the code always updated and available to all the users, to use shared dedicated resources to perform the elaborations removing the load on personal computers. The application offers the users to choose different approaches for each operation; additionally, it is explicitly designed to host new approaches. The output format of each type of operation is independent from the selected algorithm. Each output format is designed to allow a rapid and simple comparison and to be immediately usable as input for the computation of the seismic hazard.
519 95 - PublicationOpen AccessVirtualEffects un'allplicazione web per il calcolo di risentimenti dei terremoti(2010)
; ; ;Martinelli, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Scopo di questa applicazione web è quello di calcolare l’intensità virtuale di un sito sulla base di un epicentro e una funzione di attenuazione e, quando possibile, confrontarla con il dato osservato. E’ uno strumento pensato inizialmente ad esclusivo uso interno dell’Unità Funzionale in cui è stata sviluppata (UF2 della Sezione di Milano-Pavia), con la finalità di avere sempre in linea dati aggiornati (anche durante la compilazione di un nuovo catalogo parametrico dei terremoti), relazioni di attenuazione aggiornate, e demandando l’aggiornamento dei dati online ad un unico amministratore dell’applicazione. Per questo motivo in questa fase dello sviluppo, l’applicazione è pensata per l’utilizzo da parte di un utente esperto. Nel caso in cui si decidesse di aprire il sito a utenti generici inesperti, in una seconda fase si prenderanno in considerazione le esigenze e caratteristiche particolari di questo tipo di utenza (per esempio abilitando solo alcune funzioni o integrando le descrizioni del funzionamento delle diverse opzioni). Con questo testo si intende fornire all’utente esperto una descrizione sull’architettura del sistema, sul suo funzionamento, sul tipo di input e di output; eventuali feedback potranno consentire il miglioramento dell’applicazione.173 90
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