Contributors: Laboratoire Magmas et Volcans (LMV); Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC); Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA); Helmholtz Centre for Ocean Research Kiel (GEOMAR); International Ocean Discovery Program, Texas A&M University, College Station; Institute of Geophysics, University of Hamburg; Department of Geology and Geoenvironment, National and Kapodistrian University of Athens; School of Geography, Geology and the Environment, Keele University; Institut für Geo- und Umweltnaturwissenschaften, Mineralogie - Petrologie; School of Geology, Aristotle University of Thessaloniki; Department of Earth and Planetary Science UC Berkeley (EPS); University of California Berkeley (UC Berkeley); University of California (UC)-University of California (UC); Department of Earth and Planetary Sciences, University of Tennessee, Knoxville; Japan Agency for Marine-Earth Science and Technology (JAMSTEC); Institute for Geophysics, University of Texas, J.J. Pickle Research Campus; College of Earth Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA.; Institut de Physique du Globe de Paris (IPG Paris); Faculty of International Resource Sciences, Akita University; School of Ocean Sciences, China University of Geosciences; School of Natural Sciences/CODES, University of Tasmania; Geology Department, Western Washington University, Bellingham; School of Geosciences, University of South Florida, Florida, Tampa, USA; University of South Florida Tampa (USF); Columbia University, Lamont-Doherty Earth Observatory, Palisades; Graduate School of Science and Technology, Kobe University; Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR); TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS); Department of Geology, Kent State University; Department of Earth and Planetary Sciences, University of California Santa Cruz; Solid Earth Research Group, National Centre for Earth Science Studies, Thiruvananthapuram, Kerala; Geophysical Institute, University of Alaska Fairbank; Key Laboratory of Submarine Geoscience and Prospecting Techniques, Ocean University of China; School of Geography, Earth and Environmental Sciences, University of Plymouth, PL4 8AA Plymouth, United Kingdom; Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, Heraklion; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; ANR-10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010); ANR-16-IDEX-0001,CAP 20-25,CAP 20-25(2016)
نبذة مختصرة : co-auteur étranger ; International audience ; Large explosive volcanic eruptions from island arcs pour pyroclastic currents into marine basins, impacting ecosystems and generating tsunamis that threaten coastal communities and infrastructures. Risk assessments require robust records of such highly hazardous events, which is challenging as most of the products lie buried under the sea. Here we report the discovery by IODP Expedition 398 of a giant rhyolitic pumice deposit emplaced 520 ± 10 ky ago at water depths of 200 to 1000 m during a high-intensity, shallow submarine eruption of ancestral Santorini Volcano. Pyroclastic currents discharged into the sea transformed into turbidity currents and slurries, forming a >89 ± 8 km 3 volcaniclastic megaturbidite up to 150 m thick in the surrounding marine basins, while breaching of the sea surface by the eruption column laid down veneers of ignimbrite on three islands. The eruption is one of the largest recorded on the South Aegean Volcanic Arc, and highlights the hazards from submarine explosive eruptions.
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