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Conference Paper

Crater evolution and late complex tensile fracturing during the 2021 eruption at Cumbre Vieja, La Palma

Authors
/persons/resource/twalter

Walter,  Thomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Edgar,  Zorn
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Munoz Villacreses,  Valeria
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

/persons/resource/alinash

Shevchenko,  Alina V.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
1.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Gonzalez,  Pablo G.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sansosti,  Eugenio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Plank,  Simon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Reale,  Diego
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Walter, T., Edgar, Z., Munoz Villacreses, V., Shevchenko, A. V., Gonzalez, P. G., Sansosti, E., Plank, S., Reale, D. (2023): Crater evolution and late complex tensile fracturing during the 2021 eruption at Cumbre Vieja, La Palma, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0244


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016249
Abstract
Volcanic eruptions are often preceded by episodes of inflation and emplacement of magma along tensile fractures, forming dikes or sills. Here, we present evidence for crater alignments and for a complex tensile fracture dissecting part of the eruption cone, during the very late stages of the Cumbre Vieja eruption. We use satellite radar amplitude image observations, together with photogrammetrically processed drone and time-lapse camera data, to determine scale and complexities associated with the late fracturing event. In a rapid response task force we acquired in-situ data, which we complement by the use of analog models to show that formation of the tensile fractures are strongly influenced by topography, diverging at topographic highs and converging at topographic lows. The observations at the late eruption phase and from our models are of importance for understanding tensile fracture sets at the already pronounced volcano topography of La Palma, and allow speculation of a shallow topographic driver responsible for a localized dike propagation.