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Strombolian fingerprint unveiled from multiresolution analysis of geophysical observations during the 2021 eruption at Cumbre Vieja, La Palma, Canary Islands

Authors

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

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

Blanco-Montenegro,  Isabel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

Vélez,  Emilio J.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

Sainz-Maza,  Sergio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Del Barrio,  Carolina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Arnoso, J., Riccardi, U., Blanco-Montenegro, I., Montesinos, F. G., Benavent, M., Vélez, E. J., Sánchez, N., Sainz-Maza, S., Del Barrio, C. (2023): Strombolian fingerprint unveiled from multiresolution analysis of geophysical observations during the 2021 eruption at Cumbre Vieja, La Palma, Canary Islands, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3003


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018880
Abstract
Geodetic and geophysical observations are widely used to understand magmatic processes during volcanic eruptions, e.g. to asses magma ascent, accumulated magma volumes, dike distributions or small-scale pressure cycles preceding lava outflow. The last volcanic eruption in La Palma (Canary Islands, Spain) occurred at the western flank of Cumbre Vieja ridge and lasted 85 days, from September to December 2021. The eruption was a basaltic fissure type, dominated by strombolian activity with episodes of phreatomagmatic pulses. The volcanic eruption alternated lava fountains and periods of increasing frequency of strombolian explosions, forming a new edifice of about 200 m from its base around the main vent of the eruptive fissure. We deployed three magnetic and three dual-axis tiltmeter stations in La Palma during the 2021 eruptive process, at different distances from the emission centre. All equipment was operating in continuous mode and allowed us to gather 1-minute logging data. Also, we used the residual gravity signal from one spring-gravimeter situated in the vicinity of the eruptive centre. We present the results of the application of the Lomb–Scargle periodogram, cross wavelet transform and wavelet coherence to the geophysical time series. We develop a multiresolution wavelet analysis by splitting signals into suitable sets of different frequency ranges, in order to decompose the variability of the data into physically meaningful and interpretable parts. Our data revealed periodic geomagnetic, tilt and gravity signals with different amplitudes associated to explosive cycles that maybe related to magma bubbling during the strombolian phases of the eruption.