RT Conference Proceedings
T1 Gravity changes at Cumbre Vieja, La Palma (Canary Islands), associated with the 2021 eruption
A1 González Montesinos, Fuensanta
A1 Arnoso Sampedro, José
A1 Sainz-Maza Aparicio, Sergio
A1 Gómez-Ortiz, D.
A1 Blanco- Montenegro, I.
A1 Benavent Merchán, María Teresa
A1 Vélez, E.
A1 Sánchez, N.
A1 Martín-Crespo, T.
AB 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.
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/119658
UL https://hdl.handle.net/20.500.14352/119658
LA eng
NO 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). Cite as https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018084
NO Ministerio de Ciencia e Innovación
DS Docta Complutense
RD 12 may 2025