Imaging the Absorbing Feeding and Eruptive Pathways of Deception Island, Antarctica

• Autores: Guardo, Roberto Antonino; De Siena, Luca; Prudencio, Janire; Ventura, Guido
• Año de publicación: 2022
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas y Naturales; Ingeniería, Ciencia y Tecnología; DECEPTION ISLAND; SEISMIC ABSORPTION; GEOGRAPHICAL INFORMATION SYSTEM; VISUALIZATION; Ciencias Exactas y Naturales; Ingeniería, Ciencia y Tecnología
• Institución: Universidad Nacional de Río Negro

Fil: Guardo, Roberto Antonino. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Rio Negro; Argentina
Fil: De Siena, Luca. Johannes Gutenberg University, TeMaS Terrestrial Magmatic Systems Research Area, Mainz, Germany
Fil: Prudencio, Janire. Universidad de Granada, Departamento de Física Teórica y del Cosmos, Granada, Spain
Fil: Ventura, Guido. Instituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma, Roma, Italia
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 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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