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  • 1
    Electronic Resource
    Electronic Resource
    Some aspects of seismic hazard assessment when comparing different approaches (1993)
    Springer
    Natural hazards 7 (1993), S. 133-153 
    Details
    ISSN: 1573-0840
    Keywords: Probabilistic seismic hazard assessment ; northeastern Italy ; attenuation relations ; source geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The Cornell and Gumbel approaches to probabilistic seismic hazard assessment have been applied in northeastern Italy to test the influence of various input parameters. Problems related to earthquake source geometry, seismicity descriptors, and attenuation of two ground-motion parameters of engineering interest (peak ground acceleration and macroseismic intensity) have been analyzed. The results seem to be very sensitive to this last variable (attenuation), while different methodologies can lead to very similar evaluations, if properly applied. Properly applied means that all the input parameters are prepared to satisfy the conditions of the chosen approach. In addition, the seismotectonic knowledge of the study region conditions the choice of approach to be applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00680427
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some aspects of seismic hazard assessment when comparing different approaches (1994)
    Springer
    Natural hazards 9 (1994), S. 273-273 
    Details
    ISSN: 1573-0840
    Keywords: Probabilistic seismic hazard assessment ; northeastern Italy ; attenuation relations ; source geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The Cornell and Gumbel approaches to probabilistic seismic hazard assessment have been applied in northeastern Italy to test the influence of various input parameters. Problems related to earthquake source geometry, seismicity descriptors, and attenuation of two ground-motion parameters of engineering interest (peak ground acceleration and macroseismic intensity) have been analyzed. The results seem to be very sensitive to this last variable (attenuation), while different methodologies can lead to very similar evaluations, if properly applied. Properly applied means that all the input parameters are prepared to satisfy the conditions of the chosen approach. In addition, the seismotectonic knowledge of the study region conditions the choice of approach to be applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662603
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Inferences on the main volcano-tectonic structures at Mt. Etna (Sicily) from a probabilistic seismological approach (1998)
    Springer
    Journal of seismology 2 (1998), S. 105-116 
    Details
    ISSN: 1573-157X
    Keywords: earthquake locations ; energy density ; hypocentral probability ; Mt. Etna ; volcanic structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We analysed earthquakes at Mt. Etna for the period 1983–1991 using a method that weights uncertainties in hypocentral location. Three-dimensional distributions of ‘hypocentral probability’ and ‘energy density’ were studied, and two first-order volcano-tectonic structures identified. The first, on the northern and western sides, is roughly NE–SW oriented, and strongly marks the northernmost limit of earthquake occurrences in the volcano region; the second, NNW–SSE trending, affects the south-eastern flank of the volcano, and is evidence for an almost aseismic uprise of magma along it. Both structures fit well with the geodynamic framework of eastern Sicily. On the contrary, there is no evidence for a main magma chamber, as postulated in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008096020808
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  • 4
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    Fault-Based Earthquake Rupture Forecast in Central Italy: Remarks after the L'Aquila Mw 6.3 Event (2011)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2011-02-01
    Description: In 2006 we published an earthquake hazard model called LASSCI (LAyered Seismogenic Source model in central Italy). In October 2008 we began to update the model for use in 5- and 10-year forecasts. The LASSCI-2006 model is supported by good fault-based definitions of seismogenic sources and simple physically motivated models of earthquake occurrence; the LASSCI-2009 model has been improved by revision of the error propagation assumptions and increased accuracy of the earthquake probabilities. The 6 April 2009 earthquake that struck L'Aquila occurred on the model fault having the highest probability of occurrence in the 2009 revised LASSCI forecast: it is therefore consistent with our model assumptions. Furthermore, peak ground accelerations were in reasonable agreement with the values having 90% probability of not being exceeded in 50 yr. In the revised 2009 model, the aggregate probability of having a maximum-sized event in the next 5 yr on at least one of the neighboring sources (less than 25 km distance away) decreases in L'Aquila from 10% to 7% after the earthquake occurrence, but still remains a maximum there along the central Apennines. The LASSCI models 2006 and 2009, featuring characteristic fault sources and time dependence, seem to be suitable for guidance in reconstruction and seismic retrofit in the central Appenines.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 5
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    Microseismic Portrait of the Montello Thrust (Southeastern Alps, Italy) from a Dense High‐Quality Seismic Network (2019)
    Seismological Society of America
    Details
    Publication Date: 2019-05-29
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
    Published by Seismological Society of America
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  • 6
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    Foreword (2009)
    Springer
    Details
    Publication Date: 2009-12-12
    Print ISSN: 1383-4649
    Electronic ISSN: 1573-157X
    Topics: Geosciences , Physics
    Published by Springer
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  • 7
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    Inferences on the main volcano-tectonic structures at Mt. Etna (Sicily) from a probabilistic seismological approach (1998)
    Springer
    Details
    Publication Date: 1998-01-01
    Description: We analysed earthquakes at Mt. Etna for the period 1983-1991 using a method that weights uncertainties in hypocentral location. Three-dimensional distributions of 'hypocentral probability' and 'energy density' were studied, and two first-order volcano-tectonic structures identified. The first, on the northern and western sides, is roughly NE-SW oriented, and strongly marks the northernmost limit of earthquake occurrences in the volcano region; the second, NNW-SSE trending, affects the south-eastern flank of the volcano, and is evidence for an almost aseismic uprise of magma along it. Both structures fit well with the geodynamic framework of eastern Sicily. On the contrary, there is no evidence for a main magma chamber, as postulated in the literature.
    Print ISSN: 1383-4649
    Electronic ISSN: 1573-157X
    Topics: Geosciences , Physics
    Published by Springer
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  • 8
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    When probabilistic seismic hazard climbs volcanoes: the Mt Etna case, Italy. Part I: model components for sources parametrization (2017)
    Copernicus
    Details
    Publication Date: 2017-04-05
    Description: The volcanic region of Mt Etna (Sicily, Italy) represents a perfect lab for testing innovative approaches to seismic hazard assessment, given the availability of a long record of historical and recent observations of seismic and tectonic phenomena, the high quality of various geophysical monitorings and especially because the very fast geodynamics clearly demonstrate some seismotectonic processes. We present here the model components and the procedures adopted for defining seismic sources to be used in a new generation of Probabilistic Seismic Hazard Assessment (PSHA) whose first results and maps are presented in a companion paper, Peruzza et al. (2017). The sources include, in a picture of increasing complexity, area seismic zones, individual faults and gridded point sources that are obtained by integrating geological field data with long and short earthquake datasets (the historical macroseismic catalogue that covers about three centuries, and a high-quality instrumental locations database for the last decades). The analysis of the frequency-magnitude distribution identifies two main fault systems within the volcanic complex featuring different seismic rates that are controlled essentially by volcano-tectonic processes. We discuss the variability of the mean occurrence times of major earthquakes along the main Etnean faults by using an historical approach and a purely geologic method. We derive a magnitude-size scaling relationship specific for this volcanic area, which was has been implemented into a recently developed software tool – FiSH, Pace et al. (2015) – which we use to calculate the characteristic magnitudes and the related mean recurrence times expected for each fault. Results suggest that for Mt Etna area, the traditional assumptions of uniform and Poissonian seismicity can be relaxed; a time-dependent fault-based modelling, joined with a 3D imaging of volcano-tectonic sources depicted by the recent instrumental seismicity, can be therefore implemented in PSHA maps. They can be relevant for the retrofitting of the existing building stock, and for driving risk reduction interventions. These analyses do not account regional M 〉 6 seismogenic sources which dominate the hazard at long exposure times (≥ 50 yrs).
    Electronic ISSN: 2195-9269
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 9
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    When probabilistic seismic hazard climbs volcanoes: the Mt Etna case, Italy – Part 2: computational implementation and first results (2017)
    Copernicus
    Details
    Publication Date: 2017-04-05
    Description: This paper describes the model implementation and presents results of a probabilistic seismic hazard assessment (PSHA) for the Mt Etna volcanic region in Sicily, Italy considering local volcano-tectonic earthquakes. Working in a volcanic region presents new challenges not typically faced in more standard PSHA, which are most broadly due to the nature of the local volcano-tectonic earthquakes, the cone shape of the volcano, and the attenuation properties of seismic waves in the volcanic region. These have been accounted for through the development of a seismic source model that integrates data from different disciplines (historical and instrumental earthquake datasets, tectonic fault data, etc. presented in a companion paper Part I, Azzaro et al., 2017), and by the development and software implementation of original tools for the computation, such as a new ground-motion prediction equation and magnitude-scaling relationship specifically derived for this volcanic area, and the capability to account for the surficial topography in the hazard calculation, which influences source-to-site distances. Hazard calculations have been carried out using two widely used PSHA software packages (CRISIS, Ordaz et al., 2013; the OpenQuake-engine, Pagani et al., 2014). Results are referred to short to mid-term exposure times (10 % probability of exceedance in 5 and 30 years, Poisson and time-dependent) and spectral amplitudes of engineering interest. A preliminary exploration of the impact of site-specific response is also presented for the most densely inhabited region, and the variability in expected ground motion is finally commented. These results do not account for the M 〉 6 regional seismogenic sources that dominate the PSHA at long return periods, but present a different viewpoint that we believe is also relevant for retrofitting of the existing buildings, and for driving impending interventions of risk reduction.
    Electronic ISSN: 2195-9269
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 10
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    When probabilistic seismic hazard climbs volcanoes: the Mt. Etna case, Italy – Part 1: Model components for sources parameterization (2017)
    Copernicus
    Details
    Publication Date: 2017-11-22
    Description: The volcanic region of Mt. Etna (Sicily, Italy) represents a perfect lab for testing innovative approaches to seismic hazard assessment. This is largely due to the long record of historical and recent observations of seismic and tectonic phenomena, the high quality of various geophysical monitoring and particularly the rapid geodynamics clearly demonstrate some seismotectonic processes. We present here the model components and the procedures adopted for defining seismic sources to be used in a new generation of probabilistic seismic hazard assessment (PSHA), the first results and maps of which are presented in a companion paper, Peruzza et al. (2017). The sources include, with increasing complexity, seismic zones, individual faults and gridded point sources that are obtained by integrating geological field data with long and short earthquake datasets (the historical macroseismic catalogue, which covers about 3 centuries, and a high-quality instrumental location database for the last decades). The analysis of the frequency–magnitude distribution identifies two main fault systems within the volcanic complex featuring different seismic rates that are controlled essentially by volcano-tectonic processes. We discuss the variability of the mean occurrence times of major earthquakes along the main Etnean faults by using an historical approach and a purely geologic method. We derive a magnitude–size scaling relationship specifically for this volcanic area, which has been implemented into a recently developed software tool – FiSH (Pace et al., 2016) – that we use to calculate the characteristic magnitudes and the related mean recurrence times expected for each fault. Results suggest that for the Mt. Etna area, the traditional assumptions of uniform and Poissonian seismicity can be relaxed; a time-dependent fault-based modeling, joined with a 3-D imaging of volcano-tectonic sources depicted by the recent instrumental seismicity, can therefore be implemented in PSHA maps. They can be relevant for the retrofitting of the existing building stock and for driving risk reduction interventions. These analyses do not account for regional M  〉  6 seismogenic sources which dominate the hazard over long return times (≥ 500 years).
    Print ISSN: 1561-8633
    Electronic ISSN: 1684-9981
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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