Tephra sedimentation and grainsize associated with pulsatory activity: the 2021 Tajogaite eruption of Cumbre Vieja (La Palma, Canary Islands, Spain)

Article Article scientifique Article Tephra sedimentation and grainsize associated with pulsatory activity: the 2021 Tajogaite eruption of Cumbre Vieja (La Palma, Canary Islands, Spain) eng 2023-05-11 2023-05-11 author Bonadonna Costanza 0000-0002-2368-2193 636612 Services communs du département des sciences de la terre (DETCO) author Pistolesi Marco author Dominguez Lucia 751781 Services communs du département des sciences de la terre (DETCO) author Freret-Lorgeril Valentin 918379 author Rossi Eduardo 790593 author Fries Allan Alexis 873997 Services communs du département des sciences de la terre (DETCO) author Biasse Sébastien 0000-0002-1919-9473 583087 Services communs de l'Institut des sciences de l'environnement (ISECO) author Voloschina Marija author Lemus Jonathan 872952 Services communs du département des sciences de la terre (DETCO) author Romero Jorge E. author Zanon Vittorio author Pastore Camille Naomi 965717 Services communs du département des sciences de la terre (DETCO) author Reyes Hardy Maria-Paz 0000-0001-8456-7546 945821 Services communs du département des sciences de la terre (DETCO) author Di Maio Luigia Sara 944255 Services communs du département des sciences de la terre (DETCO) author Gabellini Pietro author Martin-Lorenzo Alba author Rodriguez Fatima author Perez Nemesio M. 1166073 10.3389/feart.2023.1166073 2296-6463 https://www.frontiersin.org/articles/10.3389/feart.2023.1166073/full <p>Long-lasting eruptions are of complex characterization and are typically associated with challenging risk assessment and crisis management due to the usual occurrence of multiple interacting hazards evolving at different temporal and spatial scales (e.g., lava, tephra, and gas). The 2021 Tajogaite eruption of Cumbre Vieja (La Palma) demonstrated how even hybrid events that are mostly effusive can be associated with widespread and impacting tephra deposits as a result of a complex interplay among gas flux, conduit geometry, and magma feeding rate. In this novel study, direct observations, syn-eruptive and post-eruptive sampling, and statistical analysis of pulsatory activity have been combined to provide new insights into eruption dynamics. They show how rapid gas segregation and high magma ascent rate modulated the gas flux at multiple vents, resulting in short-time fluctuations among the different explosive styles (ash-poor gas puffing, Strombolian, violent Strombolian, and lava fountaining) and unsteady tephra ground accumulation. Various size-selective sedimentation processes were also observed, including particle aggregation and ash fingers, which have impacted the overall tephra dispersal. In fact, even though both local and total grainsize distributions of selected layers, units, and of the whole tephra blanket are unimodal with a low fine-ash content, grainsize analysis of 154 samples suggests no correlation of particles &lt;63 μm with distance from vents. Our analyses demonstrate the need to include a detailed characterization of all products of hybrid eruptions for a comprehensive interpretation of eruptive dynamics and to use multiple classification strategies that can capture eruptive styles at different temporal scales.</p> Dewey 550 Swiss National Science Foundation A new probabilistic framework for regional volcanic risk assessment including hazards interacting at multiple temporal and spatial scales 188757 CH Projects 42 Département des sciences de la Terre 154 false 667 Physical Volcanology and Geological Risk Frontiers in earth science 11 5484959a-8b8a-458e-94c5-6c94fa7eae55 Article (Published version) Public Bonadonna-etal-2023-LaPalma.pdf 6257176 application/pdf CC BY d350514af9bb910efc8d16c263ac3caa1e366caab57d9d145915099037891ff3 openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre

Title	Published in	Year	Views	Downloads

Tephra sedimentation and grainsize associated with pulsatory activity: the 2021 Tajogaite eruption of Cumbre Vieja (La Palma, Canary Islands, Spain)	Frontiers in earth science	2023	113	78
Physical Characterization of Long‐Lasting Hybrid Eruptions: the 2021 Tajogaite Eruption of Cumbre Vieja (La Palma, Canary Islands)	Journal of geophysical research. Solid earth	2022	300	183

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