Combining hydro-acoustic sources and bathymetric differences to track the vent evolution of the Mayotte eruption, Mozambique Channel

Type Article
Date 2022-10
Language English
Author(s) Saurel Jean-Marie1, Retailleau Lise1, 2, Deplus Christine1, Loubrieu Benoit3, Pierre Delphine3, Frangieh Michel1, Khelifi Nassim1, Bonnet Robin3, Ferrazzini Valérie1, 2, Bazin Sara4, Guyavarch Pierre3, Moulin MarylineORCID3
Affiliation(s) 1 : Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France
2 : Observatoire volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, La Plaine des Câfres, Réunion
3 : University Brest, CNRS, Ifremer, Plouzane, France
4 : University Brest, CNRS, Ifremer, Plouzane, France
Source Frontiers In Earth Science (2296-6463) (Frontiers Media SA), 2022-10 , Vol. 10 , P. 983051 (10p.)
DOI 10.3389/feart.2022.983051
Keyword(s) hydro-acoustic analysis, bathymetric analysis, multi-beam echo sounder, submarine eruption, Mayotte, lava flows, ocean bottom seismometer

The majority of Earth volcanism takes place in the deep ocean. Deep-sea volcanoes are particularly complicated to study due to their remoteness. Very different methods can be used and their combination can lead to crucial information about submarine volcanoes behavior. In Mayotte, Comoros archipelago, efforts have been made to study and monitor the deep volcanic activity (∼3000 m) currently occurring east of Mayotte through various methods and campaigns on land and at sea. In October 2020, a line of 10 Ocean Bottom Seismometers was deployed during 10 days, leading to a hand-picked catalog of more than a thousand of hydro-acoustic signals, which have been associated with reactions between hot lava and deep cold ocean waters. During the same period, repeated swath bathymetry surveys were performed over an active lava flow field. We compare the time evolution of the hydro-acoustic events locations and bathymetry differences observed between each survey. While bathymetric information gives absolute location of new lava flows, hydro-acoustic events give detailed relative time variations leading to short-term spatial evolution. Bathymetric information thus provides snapshots of the eruptive area evolution at specific times, when hydro-acoustic signals show its continuous evolution. By combining both complementary analyses we are able to clearly define the detailed evolution of the lava flows pattern in the short time period of 10 days. Applied to the data already acquired on Mayotte since 2019, this method could allow us to estimate more precisely the volcano effusion rate and its evolution, giving further insights on the feeding system.

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Saurel Jean-Marie, Retailleau Lise, Deplus Christine, Loubrieu Benoit, Pierre Delphine, Frangieh Michel, Khelifi Nassim, Bonnet Robin, Ferrazzini Valérie, Bazin Sara, Guyavarch Pierre, Moulin Maryline (2022). Combining hydro-acoustic sources and bathymetric differences to track the vent evolution of the Mayotte eruption, Mozambique Channel. Frontiers In Earth Science, 10, 983051 (10p.). Publisher's official version : , Open Access version :