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  1. Article ; Online: Hydrogeochemical temporal variations related to the recent volcanic eruption at the Cumbre Vieja Volcano, La Palma, Canary Islands

    Cecilia Amonte / Gladys V. Melián / María Asensio-Ramos / Nemesio M. Pérez / Eleazar Padrón / Pedro A. Hernández / L. D’Auria

    Frontiers in Earth Science, Vol

    2022  Volume 10

    Abstract: From October 2017, as a response to the occurrence of several seismic swarms on La Palma (Canary Islands, Spain), we strengthened the volcano monitoring of the Cumbre Vieja system by carrying out periodic hydrogeochemical sampling at different points of ... ...

    Abstract From October 2017, as a response to the occurrence of several seismic swarms on La Palma (Canary Islands, Spain), we strengthened the volcano monitoring of the Cumbre Vieja system by carrying out periodic hydrogeochemical sampling at different points of interest. Two galleries—Peña Horeb (PH) and Trasvase Oeste (TO)—and one well—Las Salinas (LS)—were selected with this objective. Significant temporal variations in the pH, EC, ion content (HCO3−, F−, Cl−, Br−, SO42-, Na+, Ca2+, and Mg2+), partial pressure of carbon dioxide (pCO2), and isotopic signature of dissolved CO2 (δ13C-CO2) were observed throughout the study period. These changes were observed in both chemical and isotopic compositions and were related to the interaction between deep volcanic fluids and groundwaters. They coincided with the occurrence of different seismic swarms, leading to the final Tajogaite volcano eruption, which occurred in Cumbre Vieja from 19 September to 13 December 2021. This work highlights the usefulness of monitoring the chemical and isotopic composition of the groundwaters related to active volcanic systems as they can provide important information about the magmatic gas input in the aquifers.
    Keywords Cumbre Vieja eruption ; groundwater ; hydrogeochemistry ; La Palma ; Tajogaite volcano ; volcanic surveillance ; Science ; Q
    Subject code 550
    Language English
    Publishing date 2022-10-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Volcanic monitoring of the 2021 La Palma eruption using long-period magnetotelluric data

    P. Piña-Varas / J. Ledo / P. Queralt / D. Martínez van Dorth / A. Marcuello / I. Cabrera-Pérez / L. D’Auria / A. Martí

    Scientific Reports, Vol 13, Iss 1, Pp 1-

    2023  Volume 10

    Abstract: Abstract Between September and December 2021, the first subaerial volcanic eruption in the Canary Islands in 50 years took place on the island of La Palma. Since November 2021, we have been conducting a long-period magnetotelluric (MT) monitoring ... ...

    Abstract Abstract Between September and December 2021, the first subaerial volcanic eruption in the Canary Islands in 50 years took place on the island of La Palma. Since November 2021, we have been conducting a long-period magnetotelluric (MT) monitoring experiment at a site located 2.4 km east of the volcanic cone. Having continuously recorded data since then, the obtained dataset shows significant changes in resistivity over the fourteen months following the eruption: more than ± 20% in apparent resistivity and ± 2 degrees in phase. These temporal variations in electrical resistivity, recorded continuously using long-period MT during both the syn- and post-eruptive stages, have not been reported to date, making this dataset unique. Four estimated impedances have been selected as representatives of the major temporal changes observed and inverted to generate new 3-D resistivity models. The results provide novel key information on the spatiotemporal evolution of the subsoil's electrical resistivity, enabling the characterization of a set of structures acting as preferred magmatic fluid pathways. Therefore, our study highlights the strong potential of MT as a volcanic monitoring tool and provides new insights about the evolution of the fluid pathways during the post-eruptive stage. These findings enhance our understanding of the magmatic system and may contribute to volcanic hazard mitigation in the future.
    Keywords Medicine ; R ; Science ; Q
    Subject code 550
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Denoising of magnetotelluric signals by polarization analysis in the discrete wavelet domain

    Carbonari, R / L. D'Auria / R. Di Maio / Z. Petrillo

    Computers and Geosciences. 2017 Mar., v. 100

    2017  

    Abstract: Magnetotellurics (MT) is one of the prominent geophysical methods for underground deep exploration and, thus, appropriate for applications to petroleum and geothermal research. However, it is not completely reliable when applied in areas characterized by ...

    Abstract Magnetotellurics (MT) is one of the prominent geophysical methods for underground deep exploration and, thus, appropriate for applications to petroleum and geothermal research. However, it is not completely reliable when applied in areas characterized by intense urbanization, as the presence of cultural noise may significantly affect the MT impedance tensor estimates and, consequently, the apparent resistivity values that describe the electrical behaviour of the investigated buried structures. The development of denoising techniques of MT data is thus one of the main objectives to make magnetotellurics reliably even in urban or industrialized environments. In this work we propose an algorithm for filtering of MT data affected by temporally localized noise. It exploits the discrete wavelet transform (DWT) that, thanks to the possibility to operates in both time and frequency domain, allows to detect transient components of the MT signal, likely due to disturbances of anthropic nature. The implemented filter relies on the estimate of the ellipticity of the polarized MT wave. The application of the filter to synthetic and field MT data has proven its ability in detecting and removing cultural noise, thus providing apparent resistivity curves more smoothed than those obtained by using raw signals.
    Keywords algorithms ; geophysics ; impedance ; industrialization ; petroleum ; urbanization ; wavelet
    Language English
    Dates of publication 2017-03
    Size p. 135-141.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0098-3004
    DOI 10.1016/j.cageo.2016.12.011
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Clues on the origin of post-2000 earthquakes at Campi Flegrei caldera (Italy)

    G. Chiodini / J. Selva / E. Del Pezzo / D. Marsan / L. De Siena / L. D’Auria / F. Bianco / S. Caliro / P. De Martino / P. Ricciolino / Z. Petrillo

    Scientific Reports, Vol 7, Iss 1, Pp 1-

    2017  Volume 10

    Abstract: Abstract The inter-arrival times of the post 2000 seismicity at Campi Flegrei caldera are statistically distributed into different populations. The low inter-arrival times population represents swarm events, while the high inter-arrival times population ... ...

    Abstract Abstract The inter-arrival times of the post 2000 seismicity at Campi Flegrei caldera are statistically distributed into different populations. The low inter-arrival times population represents swarm events, while the high inter-arrival times population marks background seismicity. Here, we show that the background seismicity is increasing at the same rate of (1) the ground uplift and (2) the concentration of the fumarolic gas specie more sensitive to temperature. The seismic temporal increase is strongly correlated with the results of recent simulations, modelling injection of magmatic fluids in the Campi Flegrei hydrothermal system. These concurrent variations point to a unique process of temperature-pressure increase of the hydrothermal system controlling geophysical and geochemical signals at the caldera. Our results thus show that the occurrence of background seismicity is an excellent parameter to monitor the current unrest of the caldera.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2017-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Integrated tomographic methods for seismic imaging and monitoring of volcanic caldera structures and geothermal areas

    O. Amoroso / G. Festa / P. P. Bruno / L. D'Auria / G. De Landro / V. Di Fiore / S. Gammaldi / S. Maraio / M. Pilz / P. Roux / G. Russo / V. Serlenga / M. Serra / H. Woith / A. Zollo

    Journal of Applied Geophysics

    2018  

    Publishing country de
    Document type Article ; Online
    DOI 10.1016/j.jappgeo.2017.11.012
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: The Campi Flegrei Blind Test

    E. Priolo / L. Lovisa / A. Zollo / G. Böhm / L. D'Auria / S. Gautier / F. Gentile / P. Klin / D. Latorre / A. Michelini / T. Vanorio / J. Virieux

    International Journal of Geophysics, Vol

    Evaluating the Imaging Capability of Local Earthquake Tomography in a Volcanic Area

    2012  Volume 2012

    Keywords Geophysics. Cosmic physics ; QC801-809 ; Physics ; QC1-999 ; Science ; Q ; DOAJ:Geophysics and Geomagnetism ; DOAJ:Earth and Environmental Sciences
    Language English
    Publishing date 2012-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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