Options
Nunziata, C.
Loading...
Preferred name
Nunziata, C.
Staff
former
3 results
Now showing 1 - 3 of 3
- PublicationOpen AccessMitigation of seismic hazard of a megacity: the case of Naples(1995-11)
; ; ; ;Nunziata, C.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy ;Fah, D.; Istituto di Geodesia e Geofisica, Università di Trieste, Italy ;Panza, G. F.; International Centre for Theoretical Physics, Trieste, Italy; ; The seismic ground motion of a test area in the eastern district of Naples was computed with a hybrid technique based on the rnode surnrnation and the finite difference methods. This technique allowed the realistic modelling of source and propagation effects, including local soil conditions. In the modelling, as seismic source we considered the 1980 Irpinia earthquake, a good example of strong shaking for the area of Naples, located about 90 km from the source. Along a profile through Naples, trencling N86°W, the subsoil is mainly formed by alluvial (ash, stratified sand and peat) and pyroclastic materials overlying a pyroclastic rock (yellow Neapolitan tuff) representing the Neapolitan bedrock. The detailed information available on the subsoil mechanical properties and its geometry warrants the application of the sophisticated hybrid technique. For SH waves, a comparison was made between a realistic 2-D seismic response and a standard I-D response, based on the vertical propagation of waves in a plane layered structure. As expected the sedimentary cover caused an increase in the signal's amplitudes and duration. If a thin uniform peat layer is present, the amplification effects are reduced, and the peak ground accelerations are similar to those observed for the bedrock model. This can be explained by the backscattering of wave energy at such a laqer. The discrepancies evidenced between the l -D and the 2-D seismic response suggest that serious caution must be taken in the formulation of seismic regulations. This is particularly true in the presence of the thin peat laqer where the misinatch between the l -D and the 2-D amplification functions is particularly evident in correspondence of the dominant peak and of the second significant peak.260 297 - PublicationRestrictedShear-Wave Velocity Models and Seismic Sources in Campanian volcanic areas:Vesuvio and Campi Flegrei(2006)
; ; ; ; ; ; ;Guidarelli, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Zille, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Sarao`, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Natale, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Nunziata, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Panza, G. F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ; ; ; Dobran, F.This chapter summarizes a comparative study of shear-wave velocity models and seismic sources in the Campanian volcanic areas of Vesuvius and Phlegraean Fields. These velocity models were obtained through the nonlinear inversion of surfacewave tomography data, using as a priori constraints the relevant information available in the literature. Local group velocity data were obtained by means of the frequency–time analysis for the time period between 0.3 and 2 s and were combined with the group velocity data for the time period between 10 and 35 s from the regional events located in the Italian peninsula and bordering areas and two station phase velocity data corresponding to the time period between 25 and 100 s. In order to invert Rayleigh wave dispersion curves, we applied the nonlinear inversion method called hedgehog and retrieved average models for the first 30–35km of the lithosphere, with the lower part of the upper mantle being kept fixed on the basis of existing regional models. A feature that is common to the two volcanic areas is a low shear velocity layer which is centered at the depth of about 10 km, while on the outside of the cone and along a path in the northeastern part of the Vesuvius area this layer is absent. This low velocity can be associated with the presence of partial melting and, therefore, may represent a quite diffused crustal magma reservoir which is fed by a deeper one that is regional in character and located in the uppermost mantle. The study of seismic source in terms of the moment tensor is suitable for an investigation of physical processes within a volcano; indeed, its components, double couple, compensated linear vector dipole, and volumetric, can be related to the movements of magma and fluids within the volcanic system. Although for many recent earthquake events the percentage of double couple component is high, our results also show the presence of significant non-double couple components in both volcanic areas.161 30 - PublicationOpen AccessAnalysis of tourism in Campania as a tool for the development of high-quality cultural services for sightseers: The “Reale Osservatorio Vesuviano” case history(2015)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The purpose of this work is to identify the guidelines for the development and diversification of the cultural touristic offer achievable at the Reale Osservatorio Vesuviano (ROV). Founded in 1841, it is the oldest volcano observatory in the world and it has always had the vocation for scientific-naturalistic and formative tourism. The present study investigates the connections between the sociology of tourism and the ROV’s sustainability and competitiveness as a tourist destination. Here it is performed a study of the tourist flow, based on the sociology of tourism and on the correct processing of data sets, distinguishing the ''statistical information on tourism" from "tourism statistics", as such a study is the basis of a proper market strategy in different sectors. Tourism remains, in fact, an important phenomenon in world economy: despite the economic crisis of recent years, international tourist arrivals show a positive development of the trend in all the major sub-areas into which the large international areas are traditionally divided. The principles for a future marketing plan were outlined after collecting all the relevant information. The plan was designed to enhance the overall touristic offer of the ROV, never ceasing to consider the integration of natural- scientific aspects and cultural events to be offered within the observatory itself.1008 53