Initial results from a hydroacoustic network to monitor submarine lava flows near Mayotte Island

Bazin, Sara; Royer, Jean‐Yves; Dubost, Flavie; Paquet, Fabien; Loubrieu, B.; Lavayssière, Aude; Deplus, Christine; Feuillet, Nathalie; Jacques, Éric; Rinnert, Emmanuel; Thinon, Isabelle; Lebas, Élodie; Pierre, Delphine; Retailleau, Lise; Sukhovich, Alexey; Bonnet, Robin; group, the REVOSIMA

doi:10.5802/crgeos.119

Cited by 4 publications

(8 citation statements)

References 44 publications

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“…Four autonomous hydrophones (AuHs) have been deployed approximately 50 km away from and surrounding the Fani Maoré volcano (FMV, Figure 1). These four AuHs form the MAHY hydroacoustic network used in this study and in Bazin et al [36]. The instruments continuously record the soundscape between 2 and 120 Hz and consist of a buoy containing the hydrophone sensor (HTI-90U) and a mooring line anchored to a disposable weight at the seafloor that can be released by an acoustic release (Figure 2).…”

Section: Hydrophone Deployments and Datamentioning

confidence: 99%

“…We mainly focused on impulsive events, using the same method as Bazin et al [36], but we also picked two other types of signals of interest: a few earthquakes and one landslide. We estimated the origin of earthquakes by picking the T-phase arrival times at their maximum amplitude in the spectrograms [25].…”

Section: Manual Picking and Location Of Eventsmentioning

confidence: 99%

“…However, all these observations could not reveal the precise chronology of the lava flows. Sounds of lava-water interactions were evidenced by ocean-bottom hydrophones [31] and by the MAHY hydrophone network [36] (Figure 1). Bazin et al [36] observed numerous impulsive events in the MAHY hydroacoustic data on 15 November 2020.…”

Section: Introductionmentioning

confidence: 99%

“…Sounds of lava-water interactions were evidenced by ocean-bottom hydrophones [31] and by the MAHY hydrophone network [36] (Figure 1). Bazin et al [36] observed numerous impulsive events in the MAHY hydroacoustic data on 15 November 2020. All were consistently located in a recent lava field, mapped by diachronic bathymetric surveys.…”

Section: Introductionmentioning

confidence: 99%

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Hydroacoustic Monitoring of Mayotte Submarine Volcano during Its Eruptive Phase

Lavayssière,

Bazin,

Royer

2024

Geosciences

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Submarine volcanoes are more challenging to monitor than subaerial volcanoes. Yet, the large eruption of the Hunga Tonga-Hunga Ha’apai volcano in the Tonga archipelago in 2022 was a reminder of their hazardous nature and hence demonstrated the need to study them. In October 2020, four autonomous hydrophones were moored in the sound fixing and ranging channel 50 km offshore Mayotte Island, in the North Mozambique Channel, to monitor the Fani Maoré 2018–2020 submarine eruption. Between their deployment and July 2022, this network of hydrophones, named MAHY, recorded sounds generated by the recent volcanic activity, along with earthquakes, submarine landslides, marine mammals calls, and marine traffic. Among the sounds generated by the volcanic activity, impulsive signals have been evidenced and interpreted as proxy for lava flow emplacements. The characteristics and the spatio-temporal evolution of these hydroacoustic signals allowed the estimation of effusion and flow rates, key parameters for volcano monitoring. These sounds are related to the non-explosive quenching of pillow lavas due to the rapid heat transfer between hot lava and cold seawater, with this process releasing an energy equivalent to an airgun source as used for active seismic exploration. Volcano observatories could hence use autonomous hydrophones in the water column to detect and monitor active submarine eruptions in the absence of regular on-site seafloor survey.

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Section: Hydrophone Deployments and Datamentioning

confidence: 99%

Section: Manual Picking and Location Of Eventsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydroacoustic Monitoring of Mayotte Submarine Volcano during Its Eruptive Phase

Lavayssière,

Bazin,

Royer

2024

Geosciences

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“…The conditions required for the genesis and eruption of phonolitic lavas such as those found in this new volcano are explored [Andújar et al, 2022]. Monitoring lavas flows with an hydroacoustic network seems a promising development for the study of the eruptive sequence [Bazin et al, 2022]. Onland gases emissions on Petite Terre offer a window on magmatic processes occurring at depth during volcanic unrest [Liuzzo et al, 2022].…”

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confidence: 99%

Special issue Comptes-Rendus Geoscience: The Mayotte seismo-volcanic crisis of 2018–2021 in the eastern Comoros archipelago (Mozambique channel)

Woerd¹,

Famin²,

Humler³

2023

Comptes Rendus. Géoscience

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Hydroacoustic Study of a Seismic Swarm in 2016–2017 near the Melville Transform Fault on the Southwest Indian Ridge

Ingale

Bazin

Olive

et al. 2023

Bulletin of the Seismological Society of America

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Hydroacoustic monitoring has become particularly efficient for studying the low-magnitude seismicity occurring at mid-ocean ridges. In 2016–2017, a seismic swarm occurred near the Melville transform fault of the ultraslow-spreading Southwest Indian Ridge in the Indian Ocean. It comprised 258 events in the land-based International Seismological Centre catalog, extending from June 2016 to March 2017. We examined this seismicity using hydroacoustic records from three to nine hydrophones moored in the southern Indian Ocean from the Hydroacoustic Observatory of Seismicity and Biodiversity in the Indian Ocean (OHASISBIO) temporary network and the International Monitoring System of the Comprehensive Nuclear-Test-Ban Treaty Organization. We detected 27,624 hydroacoustic events spanning 298 days (1 June 2016–25 March 2017) with lower localization and origin time errors. These include several energetic, short-duration impulsive events, which we interpret as due to lava–water interactions on the seafloor. The spatio-temporal distribution of all the detected events does not show clear tectonic mainshock–aftershock sequences and suggests a magmatic origin of the swarm with bursts of seismicity likely caused by dike emplacements.

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Initial results from a hydroacoustic network to monitor submarine lava flows near Mayotte Island

Abstract: Initial results from a hydroacoustic network to monitor submarine lava flows near Mayotte Island Premiers résultats d'un réseau hydroacoustique pour surveiller les coulées de lave sous-marines près de l'île de Mayotte

Cited by 4 publications

References 44 publications

Hydroacoustic Monitoring of Mayotte Submarine Volcano during Its Eruptive Phase

Hydroacoustic Monitoring of Mayotte Submarine Volcano during Its Eruptive Phase

Special issue Comptes-Rendus Geoscience: The Mayotte seismo-volcanic crisis of 2018–2021 in the eastern Comoros archipelago (Mozambique channel)

Hydroacoustic Study of a Seismic Swarm in 2016–2017 near the Melville Transform Fault on the Southwest Indian Ridge

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