Anisotropic characterization of macroseismic fields

Teramo, A.; Stillitani, E.; Bottari, Antonio

doi:10.1007/bf00613408

Cited by 17 publications

(12 citation statements)

References 5 publications

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“…An analytical procedure has been applied to this vectorial modelling which allows the determination of the centre C of the S y system by a formula proposed recently (TERAMO et al, 1993(TERAMO et al, , 1995a(TERAMO et al, ,b, 1996:…”

Section: The Methodological Approachmentioning

confidence: 99%

“…The aim of this paper is an attempt to interpret and reshape the macroseismic study proposed by MELETTI et al (1988) by analysing the consistency of the epicentre and the principal attenuation directions, analytically determined by a vectorial modelling proposed recently (TERAMO et al, 1993(TERAMO et al, , 1995a, with respect to the observed intensity distribution and the tectonic trend of the analysed region. Such a vectorial modelling, applied both to the macroseismic fields and to the intensity maps, consists of the transformation of the intensity distribution in a set of bound vectors whose centre and resultant individualise, respectively, the epicentre and the direction of the macroseismic intensity attenuation of the analysed event (TERAMO et al,1996).…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, given that for the zones in which the superposition of some isoseismal areas of the macroseismic fields proposed by MELETTI et al (1988) is noticed, it is impossible to associate the observed intensity points with their respective fields, a new modelling of intensity distribution is adopted. Applying to such a modelling the above-mentioned vectorial modelling, it has been possible to carry out a verification of the consistency with the observed intensity of the epicentre and the attenuation directions, both taking into account or ignoring some points of the intensity map which are not compatible with an anisotropic attenuation model of intensity (TERAMO et al, 1993(TERAMO et al, , 1995a, and approximating the real observed intensity points to the immediately higher or lower intensity levels. This allows for the discussion of a possible reshaping of the intensity distribution into three distinct seismic events according to the hypotheses of MELETTI et al (1988).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The December 5th, 1456 Central Italy Earthquake: A Discussion of a Possible Reshaping of Intensity Distribution by Vectorial Modelling

Teramo

Stillitani

Bottari

et al. 1999

Pure and Applied Geophysics

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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.

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Section: The Methodological Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The December 5th, 1456 Central Italy Earthquake: A Discussion of a Possible Reshaping of Intensity Distribution by Vectorial Modelling

Teramo

Stillitani

Bottari

et al. 1999

Pure and Applied Geophysics

Self Cite

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“…The reliability of these approximation procedures and, consequently, of each macroseismic plane has been evaluated testing the consistency of the epicenter and the principal attenuation directions, determined by a suitable vectorial modelling (TERAMO et al, 1993(TERAMO et al, , 1995a(TERAMO et al, , 1996BOTTARI et al, 1995;TERMINI et al, 1995) that involve all intensity levels, respectively with the barycenter of the areolas of the macroseismic planes to which the maximum intensity level is associated and the tectonic trend of the seismogenic zones to which the events are referable.…”

Section: The Usual Proceduresmentioning

confidence: 99%

On the Observed Intensity Filtering in the Anisotropic Distribution Modelling of Macroseismic Intensity

Termini

Teramo

Tuvè

et al. 2005

Pure appl. geophys.

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The anisotropic modelling of intensity distribution, affected by the construction of macroseismic planes, allows an analysis of the influence of each point of observed intensity on the analytical determination of epicenter and of the principal attenuation directions. Such a procedure is a vital aid in the cases in which the observed intensity points, that, for location or joined intensity level, are not consistent with an anisotropic model of intensity attenuation. A suitable filtering on intensity levels associated with the points of the intensity map, for a better modelling of observed intensity distribution, is proposed with the aim of a better seismic hazard evaluation.

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“…Let us assume therefore a proportionality for the X function, with the moment of inertia of the generic isoseismal area (Teramo et al, 1993;1995), or of the homonymous areolas, with respect to a coordinate system with origin in their baricentre Gi. The vi vectors, applied in Gi, will have modules proportional to the X maximum (minimum) value, that is, they will coincide with the maximum (minimum) central moments of inertia and will have the directions of the correspondent central axes of inertia.…”

Section: Vectorial Modelling Of Intensity Distributionmentioning

confidence: 99%

The determination of the epicentre by a vectorial modelling of macroseismic intensity distribution

et al. 1996

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A vectorial modelling of observed macroseismic intensity aimed at the analytical determination of the epicentre is proposed here. The methodology is based on the determination of a plane system of vectors which characterises the macroseismic intensity distribution. The epicentre of each seismic event considered is determined as the centre of this vector system by an analytical expression which is independent from all possible directions of seismic energy propagation. The analysis of the intensity distribution is carried out by a new model called a macroseismic plane, different from the one known as macroseismic field, formed by a set of small areas built around the observed intensity points; hence its name.With the proposed methodology, some earthquakes in southern Italy and eastern Sicily are analysed calculating their epicentres, also for distributions of observed intensity which are particularly complex.

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Anisotropic characterization of macroseismic fields

Cited by 17 publications

References 5 publications

The December 5th, 1456 Central Italy Earthquake: A Discussion of a Possible Reshaping of Intensity Distribution by Vectorial Modelling

The December 5th, 1456 Central Italy Earthquake: A Discussion of a Possible Reshaping of Intensity Distribution by Vectorial Modelling

On the Observed Intensity Filtering in the Anisotropic Distribution Modelling of Macroseismic Intensity

The determination of the epicentre by a vectorial modelling of macroseismic intensity distribution

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