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  • Response spectra
  • Seismic hazard
  • 2015-2019  (20)
  • 1
    Publication Date: 2020-12-23
    Description: Although human behavior is the crucial factor in the degree of vulnerability and the likelihood of disasters taking place, preparedness and prevention programs are not mandatory in all countries around the world. Within the framework of UPStrat-MAFA (Urban disaster Prevention Strategies using MAcroseismic FAults), we have defined the disaster prevention strategies based on education management information and actions taken in Iceland, Portugal, Spain, and Italy. A detailed comparative study shows that compulsory school in these four participating countries is greatly unprepared with regard to hazard education, and these results are in line with worldwide studies. Moreover, when hazards are addressed, this is not done at an early age, which results in a missed chance to intervene in the noncognitive side of awareness, which decreases at later ages. To comply with the urge to take actions towards training and education at an early age, we used hands-on tools and learn-by-playing approaches in an informal learning environment. To reach the older population, the audio- visual media appears to be the best and lowest cost alternative to promote risk perception, awareness and education.
    Description: Published
    Description: 77-80
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: restricted
    Keywords: Disaster prevention ; Education ; Seismic hazard ; Information strategies ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 2
    Publication Date: 2021-03-01
    Description: Natural disasters, such as earthquakes and volcanic eruptions, have strong effects on the socioeconomic well-being of countries and their people. The consequences of these events can lead to complex cascades of related incidents, and in more serious contexts they can threaten our basic survivability. The problem of the seismic risk is a well-known issue at Etna due to the high-intensities volcano-tectonic earthquakes that frequently damage the very populated flanks of the volcano. In the framework of the european UPStrat-MAFA project, seismic hazard was performed following the probabilistic approach (PSHA) based on historical macroseismic data, by using the SASHA code [D’Amico and Albarello, 2008]. This approach uses intensity site observations to compute the seismic history for each investigated locality; the results, are expressed in terms of maximum intensity expected in a given exposure time, for exceedance probability thresholds. The seismic site histories were reconstructed from the database of macroseismic observation related to the historical catalogue of Mt. Etna from 1832 to 2013 [CMTE, 2014], implemented by “spot” observations as far back as 1600 [Azzaro and Castelli, 2014]. To improve the completeness of the site seismic histories, the dataset of the observed intensities was integrated with ‘virtual’ values, calculated according to attenuation laws. The attenuation model applied is based on Bayesian statistics performed on the Etna dataset [Rotondi et al., 2013], and provides the probabilistic distribution of the intensity at a given site. The hazard maps, calculated using a grid spaced 1 km, shows that for short exposure times (10 and 30 years, Figure 1a), volcano-tectonic earthquakes are the main source of shaking for the area. In particular localities in the eastern flank of the volcano have very high probabilities to suffer damage at least of VII degree in the next 30 years. Moreover, the de-aggregation analysis between magnitude vs seismic source demonstrates that S. Tecla fault (STF in Figure 1b) is one of the structures that mostly contribute to the hazard.
    Description: Published
    Description: Nicolosi, Italy
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: open
    Keywords: Seismic hazard ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Extended abstract
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  • 3
    Publication Date: 2021-03-31
    Description: On 21 August 1962 an earthquake sequence set off near the city of Benevento, in Italy's southern Apennines. Three earthquakes, the largest having Mw 6.1, struck virtually the same area in less than 40 min (at 18:09, 18:19 and 18:44 UTC, respectively). Several historical earthquakes hit this region, and its seismic hazard is accordingly among the highest countrywide. Although poorly understood in the past, the seismotectonics of this region can be revealed by the 1962 sequence, being the only significant earthquake in the area forwhichmodern seismograms are available. We determine location, magnitude, and nodal planes of the first event (18:09 UTC) of the sequence. The focal mechanismexhibits dominant strike-slip rupture along a north-dipping, E-W striking plane or along a west-dipping, N-S striking plane. Either of these solutions is significantly different fromthe kinematics of the typical large earthquakes occurring along the crest of the Southern Apennines, such as the 23 November 1980 Irpinia earthquake (Mw 6.9), caused by predominant normal faulting along NW-SE-striking planes. The epicentre of the 21 August 1962, 18:09 event is located immediately east of the chain axis, near one of the three north-dipping, E-W striking oblique-slip sources thought to have caused one of the three main events of the December1456 sequence (Io XIMCS), the most destructive events in the southern Apennines known to date. Wemaintain that the 21August 1962, 18:09 earthquake occurred along the E-Wstriking fault systemresponsible for the southernmost event of the 1456 sequence and for two smaller but instrumentally documented events that occurred on 6May 1971 (Mw 5.0) and 27 September 2012(Mw 4.6), further suggesting that normal faulting is not the dominant tectonic style in this portion of the Italian peninsula.
    Description: Published
    Description: 375-384
    Description: 2T. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: 1962 Irpinia earthquake ; Multiple earthquake ; Focal mechanism ; Strike-slip faulting ; Active tectonics ; Seismic hazard ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2021-05-12
    Description: In the framework of the UPStrat-MAFA project, a seismic hazard assessment has been undertaken in the volcanic region of Mt. Etna as a first step in studies aimed at evaluating the risk on an urban scale. The analysis has been carried out with the SASHA code which uses macroseismic data in order to calculate, starting from the site seismic history, the maximum intensity value expected in a given site with a probability of exceedance of 10 % (Iref), for a fixed exposure time. Depending on the aims of the project, hazard is estimated for local volcano-tectonic seismicity and short exposure times (10 and 30 years), without taking into account the contribution of ‘‘regional’’ events characterized by much longer recurrence times. Results from tasks A, B and D of the project have produced an updated macroseismic dataset, better performing attenuation models and new tools for SASHA, respectively. The maps obtained indicate that the eastern flank of Etna, the most urbanized sector of the volcano, is characterized by a high level of hazard with Iref values up to degree VIII EMS, and even IX EMS locally. The disaggregated data analysis allows recognizing the ‘‘design earthquake’’ and the seismogenic fault which most contribute to the hazard at a site-scale. The latter analysis is the starting point to select the scenario earthquake to be used in the analyses of tasks C and F of the project dealing with, respectively, synthetic ground motion simulations and the evaluation of the Disruption Index.
    Description: Published
    Description: 1813–1825
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: JCR Journal
    Description: reserved
    Keywords: Volcano-tectonic earthquakes ; Macroseismic intensity ; Seismic history ; Attenuation models ; Exceedance probability ; Seismic hazard ; Mt. Etna ; 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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  • 5
    Publication Date: 2017-04-04
    Description: Earthquakes are, by far, the most relevant source of hazard for the densely urbanised areas of Mt. Etna region. Local communities living in the eastern and southern flanks of the volcano continuously suffer social and economic losses due to the very high occurrence of damaging earthquakes, which produce intensities up to degree X EMS despite of low energy (M 〈 5.0). Seismic hazard in the Mt. Etna region is controlled by two distinct types of earthquakes, namely regional and local events, which have different magnitudes and frequencies (Azzaro et al., 2008). In particular, hazard deriving from local volcano-tectonic events can be relevant if short exposure times (30 years) are considered, since the reference intensity (Iref) calculated at the exceeding probability of 10% reaches, in some localities, the IX degree (Azzaro et al., 2008; Azzaro et al., 2013). In the framework of the UPStrat-MAFA project, the seismic hazard was performed following the probabilistic approach (PSHA) based on historical macroseismic data, by using the SASHA code (D'Amico and Albarello, 2008; Albarello and D’Amico, 2013) which has been implemented in the project itself. This approach uses intensity site observations to compute the seismic history for each investigated locality; results are obtained in terms of maximum expected intensity with an exceedance probability ≥ 10% for a given exposure time. In this study we produced PSHA maps referred to local volcano-tectonic seismicity.
    Description: Published
    Description: Istanbul, Turkey
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: open
    Keywords: Seismic hazard ; Mt. Etna volcano ; 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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  • 6
    Publication Date: 2017-04-04
    Description: The Project SIGMA (Sistema Integrato di sensori in ambiente cloud per la Gestione Multirischio Avanzata) arises from the fields of Information and Communications Technologies (ICT) and advanced applications for the control, monitoring and management of high-risk processes of natural and social origin. SIGMA is a multilevel architecture whose main aim is the acquisition, integration and processing of heterogeneous data from different sources (seismic, volcanic, meteorologic, hydric, pluvial, car traffic, marine traffic, and so on) to manage and elaborate risk mitigation strategies which are important for the emergency management planning. Within the several experimental activities included in the project, there is the designing and realization of a prototype of application platform specialized to provide the operating procedures and software to the public administrations and the industrial companies, for constantly monitoring both the anthropic and natural phenomena in Sicily. In this framework, of course, the seismic risk analysis plays a very important role since Sicily is one of the Italian regions with high seismic risk. Seismic risk assessment may be approached in two different ways: i) as average seismic risk of the buildings and facilities in question during the period considered, combining the vulnerability of different building types and the seismic hazard for the site, which are then expressed in terms of the effects of the events derived from an earthquake catalogue that exceed a specified threshold during a given period; ii) as estimated damage of the buildings and the critical facilities using a scenario input described in terms of the source parameters of the hypocenter as location, magnitude, and so on. Here we deal with the hazard calculation through the code CRISIS (Ordaz, Aguilar and Arboleda) and with the code PROSCEN (PRObabilistic SCENario, [Rotondi and Zonno, 2010]) to obtain earthquake scenario to be used in the latter approach. Indeed, an earthquake scenario is a planning tool that helps decision makers to visualize the specific impact of an earthquake based on the scientific knowledge. An earthquake scenario creates a picture that the members of community can recognize and, at the same time, improves the communication between the scientific, emergency management and policy communities to seismic risk reduction.
    Description: Published
    Description: Nicolosi, Italy
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: open
    Keywords: Seismic hazard ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Extended abstract
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  • 7
    Publication Date: 2017-04-04
    Description: Risk perception is a fundamental element in the definition and the adoption of preventive counter-measures. In order to develop effective information and risk communication strategies, the perception of risks and the influencing factors should be known. This paper presents preliminary results of a survey on seismic risk perception in Italy. The research design combines a psychometric and a cultural theoretic approach. More than 5,000 on-line tests have been compiled from January 23rd till July 25th, 2013. The data collected show that in Italy seismic risk perception is strongly underestimated; 86 on 100 Italian citizens, living in the most dangerous zone (namely Zone 1), do not have a correct perception of seismic hazard. From these observations we deem that extremely urgent measures are required in Italy to reach an effective way to communicate seismic risk"This study has benefited from funding provided by the Italian Presidenza del Consiglio dei Ministri - Dipartimento di Protezione Civile (DPC). This paper does not necessarily represent DPC official opinion and policies".
    Description: Published
    Description: 69-75
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: open
    Keywords: Risk perception ; Seismic hazard ; Hazard communication ; Seismic risk ; 05. General::05.03. Educational, History of Science, Public Issues::05.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 8
    Publication Date: 2017-04-04
    Description: This review addresses long-term (tens of years) seismic ground-motion forecasting (seismic hazard assessment) in the presence of alternative computational models (the so-called epistemic uncertainty affecting hazard estimates). We review the different approaches that have been proposed to manage epistemic uncertainty in the context of probabilistic seismic hazard assessment (PSHA). Ex-ante procedures (based on the combination of expert judgments about inherent characteristics of the PSHA model) and expost approaches (based on empirical comparison of model outcomes and observations) should not be considered as mutually exclusive alternatives but can be combined in a coherent Bayesian view. Therefore, we propose a procedure that allows a better exploitation of available PSHA models to obtain comprehensive estimates, which account for both epistemic and aleatory uncertainty. We also discuss the respective roles of empirical ex-post scoring and testing of alternative models concurring in the development of comprehensive hazard maps. In order to show how the proposed procedure may work, we also present a tentative application to the Italian area. In particular, four PSHA models are evaluated ex-post against macroseismic effects actually observed in a large set of Italian municipalities during the time span 1957–2006. This analysis shows that, when the whole Italian area is considered, all the models provide estimates that do not agree with the observations. However, two of them provide results that are compatible with observations, when a subregion of Italy (Apulia Region) is considered. By focusing on this area, we computed a comprehensive hazard curve for a single locality in order to show the feasibility of the proposed procedure.
    Description: Published
    Description: 269–293
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: JCR Journal
    Description: restricted
    Keywords: Seismic hazard ; PSHA ; Testing ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk ; 05. General::05.01. Computational geophysics::05.01.04. Statistical analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
    Publication Date: 2018-03-30
    Description: 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.
    Description: Published
    Description: Blenheim (New Zealand)
    Description: 1SR. TERREMOTI - Servizi e ricerca per la Società
    Keywords: Italy ; Seismic hazard ; Building code
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 10
    Publication Date: 2019-03-26
    Description: The probabilistic assessment of the seismic hazard (PSHA) at an individual site is a standard practice, but an ergodic assumption is commonly made: the ground-motion uncertainty computed by a Ground Motion Prediction Equation (GMPE) from a global dataset is assumed to be the same as the variability at a single site. In this paper, the ergodic assumption is relaxed by means of a residual analysis, accounting for the impacts on both the median and aleatory standard deviation of a GMPE. The aleatory variability is separated from the systematic source, path and site effects using a strong motion data set from Northern Italy with multiple recordings at each site and multiple earthquakes within small regions. A local model, specifically tailored for the area, is used as the reference GMPE, which predicts the geometric mean of horizontal response spectral accelerations in the period range 0.04-4s. The spatial covariance of such repeatable effects is modeled, in order to generate spatially correlated fields of path, source and site corrections and their associated variabilities. The results can be used to prepare fully non-ergodic hazard maps of parameters of engineering interest.
    Description: Unpublished
    Description: Thessaloniki
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Keywords: GMPEs ; Northern Italy ; Seismic hazard ; Non-ergodic PSHA ; spatial correlation
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 11
    Publication Date: 2017-10-11
    Description: Stochastic models provide quantitative evaluations about the occurrence of earthquakes. A basic component of this type of models are the uncertainties in defining main features of an intrinsically random process. Even if, at a very basic level, any attempting to distinguish between types of uncertainty is questionable, an usual way to deal with this topic is to separate epistemic uncertainty, due to lack of knowledge, from aleatory variability, due to randomness. In the present study this problem is addressed in the narrow context of short-term modeling of earthquakes and, specifically, of ETAS modeling. By mean of an application of a specific version of the ETAS model to seismicity of Central Italy, recently struck by a sequence with a main event of Mw6.5, the aleatory and epistemic (parametric) uncertainty are separated and quantified. The main result of the paper is that the parametric uncertainty of the ETAS-type model, adopted here, is much lower than the aleatory variability in the process. This result points out two main aspects: an analyst has good chances to set the ETAS-type models, but he may retrospectively describe and forecast the earthquake occurrences with still limited precision and accuracy.
    Description: Civil Protection Department
    Description: Published
    Description: 11812
    Description: 5T. Modelli di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: Seismic hazard ; Statistical seismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 12
    Publication Date: 2017-08-02
    Description: 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.
    Description: Published
    Description: Santiago Chile
    Description: 5T. Modelli di pericolosità sismica e da maremoto
    Keywords: Seismic hazard ; Italy ; Building code
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 13
    Publication Date: 2018-02-15
    Description: The recent Amatrice strong event (Mw6.0) occurred on August 24, 2016 in Central Apennines (Italy) in a seismic gap zone, motivated us to study and provide better understanding of the seismic hazard assessment in the macro area defined as “Central Italy”. The area affected by the sequence is placed between the Mw6.0 1997 Colfiorito sequence to the north (Umbria-Marche region) the Campotosto area hit by the 2009 L’Aquila sequence Mw6.3 (Abruzzo region) to the south. The Amatrice earthquake occurred while there was an ongoing effort to update the 2004 seismic hazard map (MPS04) for the Italian territory, requested in 2015 by the Italian Civil Protection Agency to the Center for Seismic Hazard (CPS) of the Istituto Nazionale di Geofisica e Vulcanologia INGV. Therefore, in this study we brought to our attention new earthquake source data and recently developed ground-motion prediction equations (GMPEs). Our aim was to validate whether the seismic hazard assessment in this area has changed with respect to 2004, year in which the MPS04 map was released. In order to understand the impact of the recent earthquakes on the seismic hazard assessment in central Italy we compared the annual seismic rates calculated using a smoothed seismicity approach over two different periods; the Parametric Catalog of the Historical Italian earthquakes (CPTI15) from 1871 to 2003 and the historical and instrumental catalogs from 1871 up to 31 August 2016. Results are presented also in terms of peak ground acceleration (PGA), using the recent ground-motion prediction equations (GMPEs) at Amatrice, interested by the 2016 sequence.
    Description: Published
    Description: 5T. Modelli di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: Amatrice earthquake ; Seismic hazard ; 04.06. Seismology ; 05.08. Risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 14
    Publication Date: 2020-02-24
    Description: The results of a detailed seismic microzonation study performed at Canazei (Trentino—Northern Italy) are here presented. We investigated the local seismic response of this small village using a Level 3 seismic microzonation, the most accurate according to the Italian Code of Seismic Microzonation. This method consists of gradual steps of knowledge to consider different aspects of the amplification phenomena. A multidisciplinary approach has been performed, including a local geological study, geophysical investigations, geotechnical characterization of lithologies and numerical analyses. The obtained elastic response spectra were compared to the spectra prescribed by the Italian Building Code. Our results show the geologic and geophysical subsoil heterogeneities, responsible for different local seismic responses in terms of acceleration spectra and amplification factors.
    Description: Published
    Description: 1085-1089
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: reserved
    Keywords: Seismic microzonation ; Response spectra ; Amplification factor ; Canazei ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 15
    Publication Date: 2020-05-27
    Description: We show and discuss the similarities among the 2016 Amatrice (Mw 6.0), 1997 Colfiorito-Sellano (Mw 6.0-5.6) and 2009 L’Aquila (Mw 6.3) earthquakes. They all occurred along the crest of the central Apennines and were caused by shallow dipping faults between 3 and 10 km depth, as shown by their characteristic InSAR signature. We contend that these earthquakes delineate a seismogenic style that is characteristic of this portion of the central Apennines, where the upward propagation of seismogenic faults is hindered by the presence of preexisting regional thrusts. This leads to an effective decoupling between the deeper seismogenic portion of the upper crust and its uppermost 3 km. The decoupling implies that active faults mapped at the surface do not connect with the seismogenic sources, and that their evolution may be controlled by passive readjustments to coseismic strains or even by purely gravitational motions. Seismic hazard analyses and estimates based on such faults should hence be considered with great caution as they may be all but representative of the true seismogenic potential.
    Description: The work was supported by the Project “Abruzzo” (code: RBAP10ZC8K_001; RBAP10ZC8K_003), funded by the Italian Ministry for Education, University and Research (MIUR), and by the University of Trieste, program “Finanziamenti di Ateneo per progetti scientifici – FRA 2015”, P.I. Lorenzo Bonini.
    Description: Published
    Description: 2T. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Seismogenic source ; 24 August 2016 Amatrice earthquake ; SAR ; Shallow dipping fault ; Seismic hazard ; Central Italy ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 16
    Publication Date: 2017-04-04
    Description: In their lengthy comment on Stucchi et al. (2011), Mucciarelli and Albarello (2012) propose opinions on aspects of the study that have been discussed and reviewed in countless circumstances in Italy and internationally, from the very beginning (2003) to the end (2009) of our research.
    Description: Published
    Description: 2793-2794
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: JCR Journal
    Description: restricted
    Keywords: Seismic hazard ; Italy ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 17
    Publication Date: 2017-04-04
    Description: We developed an empirical procedure to evaluate the effect of the ground subsidence on the spatial and temporal seismic response of soils. The proposed method exploits the capabilities of the spaceborne SAR Interferometry technique to detect and map the ground subsidence with unprecedented spatial and tem- poral coverage. The information provided by satellites is combined with a-priori geological/geotechnical information to assess the soil compaction and the shortening of the soil vibration periods. The procedure was applied to estimate the shortening of the soil resonant period of Mexico City between 2005 and 2013. The results show that in approximately nine years the ground surface has subsided by approxi- mately 0.5–3.5 m and the soil resonant period has decreased by approximately 0.1–0.4 s. The obtained results, validated with field measurements, highlight the effectiveness of the proposed procedure for the continuous monitoring of the soil resonant periods. The estimated change in resonant period on Mexico City has a great impact on the response spectra used for design, it is then necessary to update the map of the soil resonant period in order to account for the change of dynamic properties of soils caused by subsidence
    Description: Published
    Description: 146-158
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: JCR Journal
    Description: restricted
    Keywords: Subsidence ; resonant period ; SAR ; GEP ; Seismic hazard ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 18
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    Istituto Nazionale di Oceanografia e di Geofisica Sperimentale-OGS
    Publication Date: 2017-04-04
    Description: Forecasting potentially damaging future earthquakes and eruptions is a basic (and expected) outcome of scientific research. Several kinds of forecast are presently performed by considering different combinations of geophysical, geological, historical information and the scientific debate focuses on feasibility of each kind of methodology and reliabilty of the relevant results.
    Description: Published
    Description: 1-5
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: JCR Journal
    Description: restricted
    Keywords: Seismic hazard ; earthquake forecasting ; early warning ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 19
    Publication Date: 2023-11-16
    Description: The paper presents the results of 5 case studies on complex site e ects selected within the project for the level 3 seismic microzonation of several municipalities of Central Italy dam- aged by the 2016 seismic sequence. The case studies are characterized by di erent geo- logical and morphological con gurations: 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- lled valleys. Peculiarities of the sites are constituted by the presence of weathered/jointed rock mass, fault zone, shear wave veloc- ity inversion, complex surface and buried morphologies. These factors make the de ni- tion of the subsoil model and the evaluation of the local response particularly complex and di cult to ascertain. For each site, after the discussion of the subsoil model, the results of site response numerical analyses are presented in terms of ampli cation 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.
    Description: Published
    Description: 5741–5777
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: JCR Journal
    Keywords: Seismic microzonation ; Ampli cation factors ; Response spectra ; Numerical analyses ; site response
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 20
    Publication Date: 2022-05-24
    Description: In this paper, we separate the residuals of ground motion prediction equations into different components, calculating the repeatable site-specific (dS2Ss), location-specific (dL2Lr) and path-specific (dP2Per) correction for the median model. In this way, we can reduce the total standard deviation (sigma) of the ground-motion model by Lanzano et al. (Bull Seismol Soc Am 106(1):73–92, 2016), removing these components and overcome the ergodic assumption. These repeatable terms are empirically estimated using a dataset composed by acceleration waveforms of Italian events mainly occurred in the Po plain and Eastern Alps (Northern Italy), in the time interval 1976–2015. The analysis is carried out on 2241 recordings, from 88 shallow earthquakes recorded by 168 sites. A local model, specifically tailored for Northern Italy, is used as the reference GMPE, which predicts the geometric mean of the horizontal peak ground accelerations and response spectral ordinates in the period range 0.04–4 s. Because most of the propagation paths sampled only once, the path-specific components and the resulting aleatory variability are also calculated from the spatial correlation of residuals, following the approach of Lin et al. (Bull Seismol Soc Am 101(5):2281–2295, 2011). We find a significant reduction of the overall ground motion variability to an extent comparable to what observed from previous studies on empirical and simulated datasets. The estimated median corrections and variance components can be used in probabilistic seismic hazard assessment for a single site and a single path in Northern Italy. As an example, we compute the hazard curves at some sites by means of three different approaches (ergodic, partially non-ergodic and full non-ergodic), in order to quantify the impact of relaxing the ergodic assumption.
    Description: Published
    Description: 4563–4583
    Description: 4T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: JCR Journal
    Keywords: GMPEs ; Northern Italy ; Seismic hazard ; Non-ergodic PSHA
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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