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  • 1
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    Macroseismic intensity evaluation with the 〈〈Fuzzy Sets Logic〉〉 (2006)
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    Publication Date: 2019-11-04
    Description: The use of a macroseismic scale often requires subjective choices and judgments which may produce inhomogeneities and biases in the resulting intensities. To get over this problem it would be necessary to formalize the decision process leading to the estimation of the macroseismic intensity but, on historical records, this is often hindered by the poorness and incompleteness of the aLailable information and by the intrinsical ambiguity of the common language. Moreover. all the intensity scales have always been created and updated to be used 〈〈in the field. on contemporary earthquakes and then it may happen tkdt even detailed historical descriptions often do not correspond to the descriptive frameworks of any grade. I11 order to face these problems. we propose in this work a computer method for the evaluation of the macroseismic intensity which makes use of the 〈〈Fuzzy Sets Logic〉〉T. his approach reproduces the taslts performed by the hurnan brain which. taking advantage of the tolerance of imprecision. is able to handle with information bearing only an approximate relation to the data. This allows to understand and make explicit some passes of the evaluation process that are unconsciously followed by the macroseismic exper
    Description: JCR Journal
    Description: open
    Keywords: macroseismic intensity ; fuzzy sets ; MCS scale ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 4775029 bytes
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  • 2
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    Reducing the subjectivity of intensity estimates: the Fuzzy Set approach (2006)
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    Publication Date: 2019-11-04
    Description: We describe a method for the encoding and the computer analysis of the macroseismic effects deduced from historical sources allowing the complete formalization of the process of seismic intensity assessment. It makes use of a multi-criteria decisions-support algorithm, based on the theory of the Fuzzy Sets. Analyzing the texts of the available sources for the 1919 Mugello (M S = 6.2) and 1920 Garfagnana (M S = 6.5) earthquakes, the observed effects are classified independently of any macroseismic scale. Each sentence reported on the sources is "decomposed" into five syntactic elementary components and represented by a set of alphanumeric codes for further processing by computer codes. This retains the maximum adherence to the original sources and avoids forced interpretations and losses of information due to the need to fit each observed effect to a description of the scale. Moreover, this scheme also allows to gather equivalent effects by reassigning them the same code, and using this new classification in further processing. This procedure could even be useful to define a new macroseismic scale on the basis of a statistical analysis of different effect occurrences.
    Description: JCR Journal
    Description: open
    Keywords: macroseismic intensity ; fuzzy sets ; Mugello ; Garfagnana ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 2973285 bytes
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  • 3
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    Deriving numerical estimates from descriptive information: the computation of earthquake parameters (2006)
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    Publication Date: 2019-11-04
    Description: We describe here how the origin time, the epicenter location, the epicentral intensity and the magnitude of the earthquakes included in the Catalogue of Strong Italian Earthquakes (CFTI3) have been determined from the documentary information available. As the literature lacks widely accepted formal definitions for these parameters in the case of macroseismic data, we developed ad hoc procedures that starting from generally shared qualitative statements give reasonable and stable results which can also be useful for statistical analysis. These procedures use all of the information available in the CFTI3 database as much as possible and make use of "robust" estimators in order to minimize the effects of anomalous data. The resulting parametric catalogue has been examined statistically for completeness showing that the great majority of the Italian earthquakes with moment magnitude larger that 5.5-6.0 of the last four centuries are correctly reported in CFTI3.
    Description: JCR Journal
    Description: open
    Keywords: macroseismic epicenter ; epicentral intensity ; macroseismic magnitude ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 8095887 bytes
    Format: application/pdf
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