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  • 1
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    New evidence of CO2 soil degassing anomalies on Piton de la Fournaise volcano and the link with volcano tectonic structures (2016)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Piton de la Fournaise (PdF) is recognised as one of the world’s most active volcanoes in terms of eruptive frequency and the substantial quantity of lava produced. Yet, with the sole exception of rather modest intracrateric fumarole activity, this seems to be in contrast with an apparent absence of any type of natural fluid emission during periods of quiescence. Measurement campaigns were undertaken during a long-lasting quiescent period (2012-2014) and just after a short lived summit eruption (June 2014) in order to identify potential degassing areas in relation to the main structural features of the volcano (ex. rift zones) with the aim of developing a broader understanding of the geometry of the plumbing and degassing system. In order to assess the possible existence of anomalous soil CO2 flux, 513 measurements were taken along transects roughly orthogonal to the known tectonic lineaments crossing PdF edifice. In addition, 53 samples of gas for C isotope analysis were taken at measurement points that showed a relatively high CO2 concentration in the soil. CO2 flux values range from 10 to 1300 g m-2 d-1 while 13C are between -26.6 to -8‰. The results of our investigation clearly indicate that there is a strong spatial correlation between the anomalous high values of diffusive soil emissions and the main rift zones cutting the PdF massif and, moreover, that generally high soil CO2 fluxes show a d13C signature clearly related to a magmatic origin.
    Description: INSU (CNRS) and La Réunion Préfecture (Projet pour la quantification de l’aléa volcanique à La Réunion)
    Description: Published
    Description: 4388–4404
    Description: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Description: JCR Journal
    Description: restricted
    Keywords: CO2 soil degassing anomalies at Piton de la Fournaise ; d13C magmatic signature ; Close link between anomalous CO2 degassing and the main seismotectonic structures ; 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    First results from pattern classification applied to seismic data recorded at Piton de la Fournaise (La Réunion) (2017)
    MISCELLANEA INGV
    Details
    Publication Date: 2017-04-04
    Description: Data mining tools were tested within the WP 5 - Task 5.1 “Characterization of the threatening phenomena from space and ground” of the European MEDiterrranean Supersite Volcanoes (MED­SUV) project to tackle various classification and pattern recognition problems. These methods were successfully exploited for the identification of impending volcanic activity at Mt. Etna (Italy). Benefiting from the positive experiences acquired, we explored the application of one of these tools to seismic data recorded at Piton de la Fournaise (La Réunion) volcano, which the WP 7 “Pilot Phase - Validation and transfer of project outcome” of MED-SUV identified as ideal test site for the validation of innovative concepts for early-warning purposes. Our case study analyzes the time span from 2014 to 2015, during which episodes of lava fountains and lava flows occurred at the Dolomieu Crater. Their duration ranged from a few hours to about two months. For this application, we processed two years of continuous seismic data, providing a specific tuning of the software. We present our preliminary results considering the frequency content of the background seismic radiation at the broadband 3C station RVL, which was located close to the base of the Dolomieu cone and to the eruptive centers. Results of pattern classification applied to seismic data recorded during eruptive episodes at Mt. Etna are also presented for comparison.
    Description: Published
    Description: Rome (Italy)
    Description: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Description: open
    Keywords: Pattern classification ; seismic data ; Piton de la Fournaise ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 3
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    Eruptive pattern classification on Mount Etna (Sicily) and Piton de la Fournaise (La Réunion) (2017)
    Geophysical Research Abstracts
    Details
    Publication Date: 2017-04-04
    Description: In the framework of the European MEDiterrranean Supersite Volcanoes (MEDSUV) project, Mt. Etna (Italy) and Piton de la Fournaise (La Réunion) were chosen as “European Supersite Demonstrator” and test site, respectively, to promote the transfer and implementation of efficient tools for the identification of impending volcanic activity. Both are “open-conduit volcanoes”, forming ideal sites for the test and validation of innovative concepts, which can contribute to minimize volcanic hazard. OneoftheaimsoftheMED-SUVprojectwasthedevelopmentofsoftwareformachinelearningapplicabletodata processing for early-warning purposes. Near-real time classification of continuous seismic data stream has been carried out in the control room of INGV Osservatorio Etneo since 2010. Subsequently, automatic alert procedures were activated. In the light of the excellent results for the 24/7 surveillance of Etna, we examine the portability of tools developed in the framework of the project when applied to seismic data recorded at Piton de la Fournaise. In the present application to data recorded at Piton de la Fournaise, the classifier aims at highlighting changes in the frequency content of the background seismic signal heralding the activation of the volcanic source and the imminent eruption. We describe the preliminary results of this test on a set of data of nearly two years starting on January 2014. This period follows three years of inactivity and deflation of the volcano and marks a renewal of thevolcanoactivity withinflation,deep seismicity (-7kmbsl) andfive eruptions with fountains and lava flowsthat lasted from a few hours to more than two months. We discuss here the necessary tuning for the implementation of the software to the new dataset analyzed. We also propose a comparison with the results of pattern classification regarding recent eruptive activity at Etna.
    Description: Published
    Description: Vienna (Austria)
    Description: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Description: open
    Keywords: seismic signals ; Piton de la Fournaise ; Etna ; data processing ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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