Mt. Vesuvius: a macroseismic study of the earthquake of 9 October 1999

Cubellis, E.; Marturano, A.

doi:10.1016/s0377-0273(02)00301-3

Cited by 17 publications

(20 citation statements)

References 34 publications

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“…It is widely recognised that the distribution of intensity and the inferred attenuation coefficients are strongly influenced by the different mechanical properties of geological substrates and outcrops (Trifunac 1990;Lee and Manic 1994;Albarello and Mucciarello 2002;Cubellis and Marturano 2002;Silveira et al 2003;Mucciarelli et al 2000Mucciarelli et al , 2004Termini et al 2005). Moreover, based on macroseismic data, several studies have proposed seismic zoning of some cities, comparing data of historical and recent earthquakes with surface geology and active tectonic structures.…”

Section: Filtering the Amplification Effectsmentioning

confidence: 99%

“…A geological sketch (top left) of the area is shown (see Fig. 4 for legend) experienced for moderate earthquakes in Neapolitan volcanic area (Vesuvius and Campi Flegrei), as well as for Italian tectonic earthquakes, a difference in epicentral intensity of 1 MCS degree corresponds to a magnitude difference of *0.5 (Gruppo di Lavoro CPTI 1999;Cubellis and Marturano 2002). For the 1883 earthquake, this result could involve the lowering of the upper bound of the previous evaluated magnitude range.…”

Section: Filtering the Amplification Effectsmentioning

confidence: 99%

“…This may be associated to various factors such as the anomalous thermal state of the crust, the high fracturing of the medium, the reduction in potential seismogenetic volume and the action of concentrated local stress (Abe 1979;Yokoyama 2001;Cubellis and Marturano 2002;Zobin 2003;McNutt 2005;Azzaro et al 2006;Cubellis et al 2004Cubellis et al , 2007. At the same time, significant volcanic earthquakes of moderate magnitude may occur and produce serious damage.…”

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confidence: 99%

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The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

2009

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This article presents the results of a detailed study of the effects of the 1883 earthquake, which occurred at the island of Ischia (Gulf of Naples) and produced the total destruction of buildings in the epicentral area (Casamicciola town). Despite the moderate magnitude, this event was characterised by very high intensities (I max = XI degree MCS) mainly due to the shallow depth of the source. The study of the earthquake shows that the intensities, which decreased rapidly with distance, were affected by source directivity, according to the causative fault geometry and tectonic structures, while local amplification of damage was observed where soft soils outcrop. The attenuation of seismic intensity with distance was evaluated using the well-known relation of intensity versus epicentral distance (Blake's method). The diverse gradients of attenuation, observed in different directions, were ascribed to the various geological features of the shallow crust of the island. In order to evaluate the role of geology in the damage level, we computed different attenuation models for stiff and soft soils outcropping on the island. A systematic local amplification of about 1 MCS degree associated to the presence of reworked tuffs was obtained. This study also shows the influence of geological conditions on the evaluation of macroseismic data and supplies useful elements to derive a predictive map of potential site effects.

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Section: Filtering the Amplification Effectsmentioning

confidence: 99%

Section: Filtering the Amplification Effectsmentioning

confidence: 99%

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confidence: 99%

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The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

2009

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“…For Ischia Island only two shock (with I0≥VIII) that are appropriate for the analysis were found (table III), one reported in the DOM database (Monachesi and Stucchi, 1997) and the other one in SGA (2002), for a total of 37 intensity data. For Vesuvius, just one earthquake of I0=VI (Cubellis and Marturano, 2002) is available, with 48 macroseismic observations (fig. 5).…”

Section: And Onementioning

confidence: 99%

The attenuation of seismic intensity in the Etna region and comparison with other Italian volcanic districts

Azzaro

Barbano

D’Amico

et al. 2009

Annals of Geophysics

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A detailed analysis of the intensity attenuation in the Etna and other Italian volcanic districts, was performed using the most recent and complete intensity datasets. Attenuation laws were derived through empirical models fitting ∆I (the difference between epicentral I0 and site Ix intensities) average values versus hypocentral site distances by the least-square method. The huge amount of data available for the Etna area allowed us to elaborate bi-linear and logarithmic attenuation models, also taking source effects into account. Furthermore, the coefficients of the Grandori formulation have been re-calculated to verify the ones previously defined for seismic hazard purposes. Among the tested relationships, the logarithmic one is simple and fairly stable, so it was also adopted for the other volcanic Italian areas. The analysis showed different attenuation trends: on the one hand, Etna and Ischia show the highest decay of intensity (∆I=4) in the first 20 km; on the contrary, the Aeolian Islands and Albani Hills present a slight intensity attenuation (∆I=2) at 20 km from the hypocentre; finally, Vesuvius seems to have an intermediate behaviour between the two groups. The proposed regionalization gives a significantly better image of near-field damage in volcanic regions and is easily applicable to probabilistic seismic hazard analyses.

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“…Finally, they are published yearly in the form of a paper bulletin. In addition, there are other occasional experiments with questionnaires involving schools and students, for the reporting of their experiences of felt earthquakes, in the framework of educational activities (Postpischl et al, 1991;Cubellis and Marturano, 2002) -On the basis of American experience (see Wald et al, 1999;Atkinson and Wald, 2007; and references therein), over the last few years, trials with Internet polls have been run with the INGV (http://terremoto.rm.ingv.it/). As well as some debatable choices of the way of formalising the questionnaire and interpreting the answers, this method for the collection of data in Italy still suffers from the major variability in the distribution of Internet access throughout the country.…”

Section: Collection and Organisation Of The Datamentioning

confidence: 99%

Macroseismology: the lessons learnt from the 1997/98 Colfiorito seismic sequence

Camassi

Azzaro

Tertulliani

2009

Annals of Geophysics

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The seismic sequence of the Umbria-Marche Apennines was a dramatic moment for the population involved. At the same time, it provided a unique occasion for the Italian scientific community and for the national civil protection to assess their respective abilities in understanding and managing the event. Furthermore, macroseismology (including historical seismology) has knowingly tackled important methodological problems, such as the procedures for assigning macroseismic intensity, the use of the macroseismic scale, the impossibility of distinguishing the effects of earthquakes following closely in both space and time, within such a complex sequence. Starting from an analysis of the problems faced after the 1997/98 Umbria-Marche earthquakes, as during the following seismic crises over the last 10 years, we propose some considerations on the lessons we have learnt from that seismic sequence.

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Mt. Vesuvius: a macroseismic study of the earthquake of 9 October 1999

Cited by 17 publications

References 34 publications

The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

The attenuation of seismic intensity in the Etna region and comparison with other Italian volcanic districts

Macroseismology: the lessons learnt from the 1997/98 Colfiorito seismic sequence

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