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Título: Imaging the Absorbing Feeding and Eruptive Pathways of Deception Island, Antarctica
Autor(es): Guardo, Roberto Antonino
De Siena, Luca
Prudencio, Janire
Ventura, Guido
Fecha de publicación: 29-sep-2022
Editorial: Geophysical Research Letters
Citación: Guardo, R., De Siena, L., Prudencio, J., & Ventura, G. (2022). Imaging the absorbing feeding and eruptive pathways of Deception Island, Antarctica. Geophysical Research Letters; 49 (19); e2022GL099540. https://doi. org/10.1029/2022GL099540
Revista: Geophysical Research Letters. AGU Advancing Earth and Space Science
Descripción: Plain Language Summary Deception Island is the gateway for tourists to Antarctica and a laboratory to understand ice-capped volcanoes and their eruptions. While the Island has been the target of many geophysical studies, no clear tomographic model shows how deep eruptive pathways of its last eruptions have reached the surface in the 1960s and 1970s. This is a recurrent topic in volcano geophysics: dikes and fluid migrations develop across structures considered too small to be detected by tomographic techniques. This paper demonstrates that seismic absorption has sufficient sensitivity to temperature and fluid content to detect these pathways. Once integrated within a Geographical Information System with all the information we have on the volcano, the models resolve the feeding systems of these eruptions, from a tectonically deformed deep magma chamber to shallow cold dyke intrusions and fluid migrations still feeding the volcano today. The correlation between seismic absorption, temperature, and fluid content offers a new tool for detecting and monitoring shallow volcanic hazards.
Abstract: Abstract Deception Island is one of the most active and best-documented volcanoes in Antarctica. Since its last eruption in 1970, several geophysical surveys have targeted reconstructing its magmatic systems. However, geophysics fails to reconstruct the pathways magma and fluids follow from depth to erupt at the surface. Here, novel data selection strategies and multi-frequency absorption inversions have been framed in a Geographical Information System, using all available geological (vents and faults distribution), geochemical and geophysical knowledge of the volcano. The result is the detection of these eruptive pathways. The model offers the first image of the magma and associated fluids pathways feed the 1967, 1969, and 1970 eruptions. Results suggest that future ascending paths might lead to active research bases and zones of planned helicopter rescue. The connection between seismic absorption, temperature, and fluid content makes it a promising attribute for detecting and monitoring eruptions at active calderas.
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ISSN: 1944-8007
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Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899

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