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  Gravity changes at Cumbre Vieja, La Palma (Canary Islands), associated with the 2021 eruption

G. Montesinos, F., Arnoso, J., Sainz-Maza, S., Gómez-Ortiz, D., Blanco-Montenegro, I., Benavent, M., Vélez, E., Sánchez, N., Martín-Crespo, T. (2023): Gravity changes at Cumbre Vieja, La Palma (Canary Islands), associated with the 2021 eruption, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1525

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018084 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018084_3
Genre: Conference Paper

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 Creators:
G. Montesinos, Fuensanta1, Author
Arnoso, Jose1, Author
Sainz-Maza, Sergio1, Author
Gómez-Ortiz, David1, Author
Blanco-Montenegro, Isabel1, Author
Benavent, Maite1, Author
Vélez, Emilio1, Author
Sánchez, Nieves1, Author
Martín-Crespo, Tomás1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The 2021 eruption at the Cumbre Vieja rift (La Palma, Canary Islands) lasted 85 days from September 19th to December 13th, becoming the longest historical eruption in this island. During this period, an elongated fissure eruption built a volcanic cone reaching 1,121 m a.s.l. Lava emerged from six major craters and up to nine minor vents with alternating activity, according to temporal variations in the eruptive process. We conducted several gravity surveys before, during and after this eruption that provided us with valuable spatial-temporal information to study this volcanic event. The obtained Bouguer anomaly map revealed a model of the shallow crustal structures before the eruption, which allowed to study the framework where the volcanic process developed. The analysis of the observed space-time gravity changes suggested a model of the magmatic feeding system, which draws the spatio-temporal path of magma ascent from the crust-mantle boundary to the surface. In addition, we also investigated the differences among the several gravity surveys to infer the possible mass changes that took place during the volcanic process. The interpretation of these gravity changes associated to the 2021 eruption at the Cumbre Vieja rift is supported by the analysis of the spatio-temporal distribution of the earthquake hypocenters preceding the eruption and the ground displacement calculated using GNSS data.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
 Publishing info: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1525
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -