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  • 1
    Electronic Resource
    Electronic Resource
    An example of seismic occurrence modelling by a several-state random process (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 108 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A statistical model of the microearthquake occurrence in the Messina area, assuming periodic transitions among several Generalized Poisson states, is proposed. Four states are defined, of different duration, cluster mean rate and earthquake interdependence level. Their sequence is cyclically repeated with annual period. The findings of this work can be seen as a generalization of the approach of Bender (1984) who considered transition phenomena of the seismic temporal pattern among distinct states of the Simple Poisson type. Further, the investigation aims at identifying possible factors leading to the observed periodic changes in the earthquake statistical parameters and to the main ‘deviations’ of experimental data from the model. The rainfall and regional tectonic stress patterns appear to be reasonable candidates for explaining the microearthquake periodicity and the most relevant anomaly of the observed seismic temporal pattern with respect to the model, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb00855.x
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  • 2
    Electronic Resource
    Electronic Resource
    Multifractal analysis of the spatial distribution of earthquakes in southern Italy (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 125 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We evaluate the complete spectrum of the generalized fractal dimension of the spatial pattern of microearthquakes in Southern Italy, revealing a multifractal distribution structure. Our analysis is focused on the dependence of the multifractal distribution on the size of the selected area and the kind of seismicity in the area. As the size of the window varies, we observe that the capacity, information and correlation dimensions vary significantly, while both d∞ and d−infin; remain unchanged within their errors limits. We interpret this result in terms of the observation that our data are mainly clustered around a linear fault (the Sisifo fault). When we restrict the selected windows around the fault, clustering around a line (the fault) is highlighted. The capacity dimension changes from about 1.8 to about 1.4 and the correlation dimension decreases because we observe in detail the clustering of the seismicity along the fault, which approximates the maximum intense clustering of the whole data set. Although our results are strongly influenced by the fact that the data are dominated by the epicentres located on the fault, we can conclude that multifractal analysis can be a very useful tool to discriminate the seismicity linked to a particular fault in a given area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb06033.x
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  • 3
    Electronic Resource
    Electronic Resource
    The December 5th, 1456 Central Italy Earthquake: A Discussion of a Possible Reshaping of Intensity Distribution by Vectorial Modelling (1999)
    Springer
    Pure and applied geophysics 155 (1999), S. 131-148 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Central Italy, macroseismic intensity distribution, epicentre, attenuation directions, felt area.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —A study of the intensity distribution of the earthquake of December 5th 1456, which affected a large area of central and southern Italy was carried out, verifying, through a recently proposed methodology, the two hypotheses assumed by different authors for one single seismic event and three distinct and close ones. This methodology is based on a vectorial modelling of the macroseismic intensity distribution which aims at determining the epicentre and the principal (minimum and maximum) attenuation directions.¶The study was structured, considering each of the two assumed hypotheses, in a set of tests obtained for the macroseismic field and the intensity map, by analysing different configurations of the observed intensity distribution.¶The results obtained are in agreement with the hypothesis of the time coexistence of three distinct seismic events, for which the calculated epicentres and the principal attenuation directions are compatible with the observed intensity distribution and with the tectonic trend of the Apennine region, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050258
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of attenuation models in seismic hazard evaluation for the North-Eastern Sicily area (1993)
    Springer
    Natural hazards 8 (1993), S. 97-107 
    Details
    ISSN: 1573-0840
    Keywords: attenuation model ; seismic hazard ; Sicily area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract From the influence already revealed by attenuation models on the values of expected intensity for North-Eastern Sicily, the necessity arises to quantify the ‘weight’ of these models and of their respective coefficients on the projection of intensity. A first evaluation is presented in this paper using the Sponheuer, Blake, and Grandori models. A comparison of the expected intensity maps allows a first critical estimate, showing the greater adaptability of the Grandori model to describe the attenuation of intensity for the investigated area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605435
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  • 5
    Electronic Resource
    Electronic Resource
    Frequency dependence of site amplification factor in the Messina Strait area (1993)
    Springer
    Pure and applied geophysics 140 (1993), S. 415-426 
    Details
    ISSN: 1420-9136
    Keywords: Site ; frequency ; ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The spectral ratio method is used here for evaluating the frequency dependence of a site amplification factor in the Messina Strait area. All stations exhibit the same features of spectral ratios evidencing two peaks at about 10 Hz and 16 Hz. We relate this observation to the same geological structures. In fact, all the stations (except the referenced one) are situated over pleistocenic sediments with a similar grain size. This causes the disappearing of any site effect when the average spectrum is used as a reference. MES station, situated in the city of Messina, presents a clear site effect at a different frequency (6 Hz) which cannot be related to any geological structure because no substantial difference is observed between the sediments on which this station is situated and the sediments on which the other stations are situated. MT1 station exhibits a spectral peak at about 2 Hz which can be explained with oscillations of a little sedimentary basin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876963
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  • 6
    Electronic Resource
    Electronic Resource
    Procedure of reduction of travel-time curves ofP andS waves at the focal surface (1993)
    Springer
    Pure and applied geophysics 140 (1993), S. 641-653 
    Details
    ISSN: 1420-9136
    Keywords: Seismic waves ; travel time ; hypocentral surface ; southern Tyrrhenian ; Japanese islands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A method for the calculation of seismic waves velocities at focal depth is here proposed. A stratified earth model with spherical symmetry and the analytical relationship between the epicentral distance and the travel times of seismic waves are used. This method, applied to the southern Tyrrhenian region and to the Japanese islands, allows to reduce the observed travel times to the focal depth independently of a particular velocity model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876581
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  • 7
    Electronic Resource
    Electronic Resource
    The Grandori model: Anisotropic formulation and its application in the plotting of seismic hazard maps (1994)
    Springer
    Pure and applied geophysics 142 (1994), S. 347-364 
    Details
    ISSN: 1420-9136
    Keywords: Attenuation model ; anisotropy ; seismic hazard ; Calabro-Sicilian area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The seismic hazard for the Calabro-Sicilian area is evaluated using an anisotropic formulation of the Grandori attenuation law. For each macroseismic field two main directions are identified: minimum and maximum attenuation of the macroseismic intensity. The results of the investigation show that the anisotropic formulation improves the compatibility level of the model (with respect to the isotropic one) with the intensities observed and produces probabilistic expected intensities which compare favourably with the values of seismic history in the investigated area when the zonation defined by the Messina University research group was used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879309
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  • 8
    Electronic Resource
    Electronic Resource
    On macroseismic attenuation parameters in the comparison of theoretical seismic hazard maps for Southern Calabria and Eastern Sicily (Southern Italy) (1995)
    Springer
    Natural hazards 11 (1995), S. 259-282 
    Details
    ISSN: 1573-0840
    Keywords: Attenuation ; seismogenic zonations ; seismic hazard maps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract For two different zonations of the Calabro-Sicilian region the macroseismic intensity attenuation parameters are computed using the Grandori model. Some modifications to this relation are proposed here in order to allow its applicability also to those cases in which the data set available for each source zone does not present three successive epicentral intensity levels (I 0) as required for its application. Maps of theoretical distribution of maximum expected intensities were plotted for both zonations adopted, in order to test the reliability, also using other attenuation models. The results of the analysis show how the proposed modifications to the Grandori relation allow the macroseismic intensity attenuation modelling even in cases in which only one intensity level is available. Finally, the comparison of theoretical maximum expected intensity distribution maps, computed for different attenuation models and seismogenic zonations, shows that the maps plotted using the Grandori model and the zonation adopted by G.N.D.T. (Gruppo Nazionale Difesa dai Terremoti - C.N.R. Italy) are more reliable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613410
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  • 9
    Electronic Resource
    Electronic Resource
    On an anisotropic attenuation law of the macroseismic intensity (1995)
    Springer
    Natural hazards 11 (1995), S. 203-221 
    Details
    ISSN: 1573-0840
    Keywords: macroseismic fields ; anisotropy ; intensity attenuation ; anisotropic attenuation law
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract An anisotropic attenuation law of the macroseismic intensity has been deduced, congruent with an anisotropic modelling of macroseismic fields. The results, obtained by analysing a set of earthquakes in Eastern Sicily and Southern Calabria, show a greater adaptability to the observed data as compared with those deduced using isotropic attenuation laws modified to take the anisotropy into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613407
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  • 10
    Electronic Resource
    Electronic Resource
    Anisotropic characterization of macroseismic fields (1995)
    Springer
    Natural hazards 11 (1995), S. 223-245 
    Details
    ISSN: 1573-0840
    Keywords: anisotropy ; macroseismic fields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A methodology for the anisotropic characterization of macroseismic fields is proposed, in order to evaluate seismic hazard, based on the real geometry of the isoseismals of the field. The proposed methodology, independent of the macroseismic intensity attenuation law, allows both for a single field and for several fields in the same source zone, the determination of minimum and maximum attenuation values and of the relative directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613408
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