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  • 1
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    Il Monitoraggio dei Vulcani Campani - Primo semestre 2019 (2021)
    Details
    Publication Date: 2021-05-12
    Description: L'Istituto Nazionale di Geofisica e Vulcanologia (INGV) è componente del Servizio Nazionale di Protezione Civile, ex articolo 6 della legge 24 febbraio 1992 n. 225 ed è Centro di Competenza per i fenomeni sismici, vulcanici e i maremoti per il Dipartimento della Protezione Civile Nazionale (DPC). L’Osservatorio Vesuviano, Sezione di Napoli dell’INGV, ha nei suoi compiti il monitoraggio e la sorveglianza H24/7 delle aree vulcaniche attive campane (Vesuvio, Campi Flegrei e Ischia). Tali attività sono disciplinate dall’Accordo-Quadro (AQ) sottoscritto tra il DPC e l’INGV per il decennio 2012-2021 e sono dettagliate negli Allegati A e B del suddetto AQ. Il presente Rapporto sul Monitoraggio dei Vulcani Campani rappresenta l’attività svolta dall’Osservatorio Vesuviano e dalle altre Sezioni INGV impegnate nel monitoraggio dell’area vulcanica campana nel primo semestre 2019.
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Unpublished
    Description: 4V. Processi pre-eruttivi
    Description: 6SR VULCANI – Servizi e ricerca per la società
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Keywords: Campi Flegrei ; Vesuvio ; Ischia ; Volcano Monitoring ; 04.06. Seismology ; 04.03. Geodesy ; 04.08. Volcanology ; 05.04. Instrumentation and techniques of general interest
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 2
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    Dynamical characterization of the shallow hydrothermal system at Ischia (2019)
    Details
    Publication Date: 2019-10-15
    Description: We have analysed the wavefield of the background seismic noise at Ischia Island (Italy), recorded between 2017 and 2018. The Independent Component Analysis highlighted two persistent independent signals, with dominant frequency peak around 1 Hz and 3–4 Hz, respectively. The first signal is the most energetic and persistent. Its polarization shows preferential directions properties, with a shallow propagation that seems to be controlled by the tectonic-volcanic structures and the morphology of the Island. Moreover it is well correlated at all the stations in Casamicciola town. The second signal evidences similar polarization properties, but it is strongly affected by cultural noise and does not show any correlation. We interpret the 1-Hz wave-packets as the signature of the shallow hydrothermal system. Following a conceptual model of self-sustained musical instruments, the shallow hydrothermal system of Ischia can be seen as a solid structure constituted by a network of channels, continuously excited by the circulating hydrothermal fluids. In this framework the 1-Hz seismic signal and the eventual higher modes would be produced by persistent self-sustained oscillations.
    Description: Published
    Description: Vienna
    Description: 4V. Processi pre-eruttivi
    Keywords: Ischia ; ICA ; hydrothermal tremor
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Abstract
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  • 3
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    Characterization of the seismic dynamical state of Ischia Volcanic Island (Italy) through the ICA and the polarization analysis applied to background seismic noise. (2019)
    Details
    Publication Date: 2019-10-11
    Description: We have investigated the seismic dynamical state of Ischia volcanic Island before and after the August 21, 2017 earthquake, by applying classical and innovative techniques to the background seismic noise. First, we searched for the presence of independent signal sources by performing the Independent Component Analysis (ICA). Over 60 days of recordings, from 26 August to 25 October 2017, the application of ICA algorithm successful separated two stable components: IC1, the most energetic and persistent, picked at ~1 Hz; and IC2, concentrated in 3-4 Hz band. The root mean square (RMS) of continuous recordings during three months of the years 2016 and 2017, was estimated in order to investigate coherence properties of the background seismic signal before and after the August 2017 earthquake, for both raw and filtered data in the frequency ranges corresponding to the two ICs. The results show no variations in the patterns. The polarization properties of the same dataset were obtained by applying the covariance matrix method. The polarization parameters were estimated by filtering the signals in the 1-2 and 3-4 Hz frequency bands. The time evolution of the mean values of the polarization pattern does not show any variation during the analysed time intervals. The statistical properties of the polarization pattern were further investigated by analysing the rose plots of the azimuth of the polarization vector. All the obtained results were interpreted taking into account the existing literature on volcanological, morphological, structural and geochemical studies. IC1 seems conditioned by tectonic and volcanic structures and by the Island morphology. It could be associated with the persistent activity of the hydrothermal system. The signal amplitude of IC2 clearly shows 24h periodicities, likely related to anthropogenic activities.
    Description: Published
    Description: Naples
    Description: 4V. Processi pre-eruttivi
    Keywords: Ischia ; ICA
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 4
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    Il Monitoraggio dei Vulcani Campani - Secondo semestre 2019 (2021)
    Details
    Publication Date: 2021-09-06
    Description: L'Istituto Nazionale di Geofisica e Vulcanologia (INGV) è componente del Servizio Nazionale di Protezione Civile, ex articolo 6 della legge 24 febbraio 1992 n. 225 ed è Centro di Competenza per i fenomeni sismici, vulcanici e i maremoti per il Dipartimento della Protezione Civile Nazionale (DPC). L’Osservatorio Vesuviano, Sezione di Napoli dell’INGV, ha nei suoi compiti il monitoraggio e la sorveglianza H24/7 delle aree vulcaniche attive campane (Vesuvio, Campi Flegrei e Ischia). Tali attività sono disciplinate dall’Accordo-Quadro (AQ) sottoscritto tra il DPC e l’INGV per il decennio 2012-2021 e sono dettagliate negli Allegati A e B del suddetto AQ. Il presente Rapporto sul Monitoraggio dei Vulcani Campani rappresenta l’attività svolta dall’Osservatorio Vesuviano e dalle altre Sezioni INGV impegnate nel monitoraggio dell’area vulcanica campana nel secondo semestre 2019.
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Unpublished
    Description: 4V. Processi pre-eruttivi
    Description: 6SR VULCANI – Servizi e ricerca per la società
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Description: 2IT. Laboratori analitici e sperimentali
    Description: 4IT. Banche dati
    Keywords: Campi Flegrei ; Vesuvio ; Ischia ; Volcano Monitoring ; 04.06. Seismology ; 04.03. Geodesy ; 04.08. Volcanology ; 05.04. Instrumentation and techniques of general interest
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
    Location Call Number Expected Availability
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