Lemoine A, Bertil D, Roulle A, Briole P, 2019. Zinke J, Reijmer J J G, Thomassin B A, 2003. The volcano-tectonic crisis of 2018 east of Mayotte, Comoros islands. (2020). 2013. According to REVOSIMA, the presence of multiple new lava flows would suggest multiple effusion points. Two contemporaneous magma series on Mayotte Island, Comores Archipelago, Indian Ocean. Several pumice layers found in cores on the barrier reef-lagoon complex indicate that volcanism likely occurred less than 7,000 years ago (Zinke et al., 2003). New activity since May 2018 consists of dominantly seismic events and lava effusion. Since 10 May 2018, hundreds of earthquakes have been recorded in Mayotte, including the strongest tremor ever recorded in the Comoros area. Based on this ground deformation data Lemoine et al. (2019) determined that the eruptive phase began fifty days after the initial seismic events occurred, on 3 July 2018.Between 2 and 18 May 2019, an oceanographic campaign (MAYOBS 1) discovered a new submarine eruption site 50 km E from the island of Mayotte (figure 2). The MAYOBS 4 (19 July 2019-4 August 2019) and SHOM (20-21 August 2019) missions revealed a new lava flow formed between 31 July and 20 August to the NW of the eruptive site with a volume of 0.08 km3 and covering 3.25 km2.During the MAYOBS 4 campaign in late July 2019, scientists dredged the NE flank of the cone for samples and took photographs of the newly erupted lava (figure 5).

The director of IPGP, Marc Chaussidon, stated in an interview with Science Magazine that multibeam sonar waves were used to determine the elevation (800 m) and diameter (5 km) of the new submarine cone (figure 3). Preprint submitted to EarthArXiv, 28 February 2019. https://doi.org/10.31223/osf.io/d46xj.The Global Volcanism Program has no synonyms or subfeatures listed for Mayotte.Mayotte, located in the Mozambique Channel between the northern tip of Madagascar and the eastern coast of Africa, consists two main volcanic islands, Grande Terre and Petite Terre, and roughly twenty islets within a barrier-reef lagoon complex (Zinke et al., 2005; Pelleter et al., 2014). Spath A, Le Roex A P, Duncan R A, 1996. They were entrusted, in the context of inter-ministerial meetings, with the task of making concrete proposals for priority action to be carried out both in research and monitoring over the short, medium and long term in order to better understand the phenomena that are occurring and to provide those responsible for public safety with the scientific knowledge necessary for crisis preparedness and management.REVOSIMA publishes bi-monthly reports to monitor the seismic-volcanic activity in Mayotte.These actions are essential for preventing disasters and protecting populations. Seismicity continued to increase during 13-15 May 2018, with the strongest recorded event for the Comoros area occurring on 15 May at 1848 and two more events on 20-21 May (figure 1). A new submarine volcano was formed off the island of Mayotte in the Indian Ocean in 2018. The "MAYOBS3" and "MAYOBS4" campaigns mapped the volcanic ridge between the active volcano (about 50 km from the island) and the seismic zone (about 15 km from the island). The MAYOBS 4 (19 July 2019-4 August 2019) and SHOM (20-21 August 2019) missions revealed a new lava flow formed between 31 July and 20 August to the NW of the eruptive site with a volume of 0.08 km3 and covering 3.25 km2.During the MAYOBS 4 campaign in late July 2019, scientists dredged the NE flank of the cone for samples and took photographs of the newly erupted lava (figure 5). Based on this ground deformation data Lemoine et al. Though seismicity and deformation continued, the most recent observation of new lava flows occurred during the MAYOBS 4 and SHOM campaigns on 20 August 2019, as reported in REVOSIMA bulletins.Lemoine A, Bertil D, Roulle A, Briole P, 2019. In addition, this multibeam sonar image showed fluid plumes within the water column rising from the center and flanks of the structure. Melilite-bearing lavas in Mayotte (France): An insight into the mantle source below the Comores. A new underwater volcano has been discovered. Volcanic eruption and earthquakes in Mayotte: surveillance entrusted to REVOSIMA 09.30.2019 Since May 2018, Mayotte has suffered many earthquakes. New activity since May 2018 consists of dominantly seismic events and lava effusion. The primary source of information for this report through February 2020 comes from semi-monthly reports from the Réseau de Surveillance Volcanologique et Sismologique de Mayotte (REVOSIMA), a cooperative program between the Institut de Physique du Globe de Paris (IPGP), the Bureau de Recherches Géologiques et Minières (BRGM), and the Observatoire Volcanologique du Piton de la Fournaise (OVPF-IPGP); Lemoine et al.

Since May 2018, Mayotte has suffered many earthquakes. When samples were brought up to the surface, they exploded due to the large amount of gas and rapid decompression.During April-May 2019 the rate of ground deformation slowed. In addition, this multibeam sonar image showed fluid plumes within the water column rising from the center and flanks of the structure. Jointly operated by the IPGP with BRGM and its regional office in Mayotte, REVOSIMA is based on a close scientific and technical partnership with Ifremer, CNRS, BRGM, IPGS and RENASS, IRD, IGN, ENS, the University of Reunion Island, the University of Clermont Auvergne, CNES, Météo France, and SHOM.The institutes involved in REVOSIMA are working together to organise the scientific and operational response to the seismic-volcanic crisis off Mayotte. Between 2 and 18 May 2019, an oceanographic campaign (MAYOBS 1) discovered a new submarine eruption site 50 km E from the island of Mayotte (figure 2). Mayotte is a volcanic island in the Comoros archipelago between the eastern coast of Africa and the northern tip of Madagascar. Deflation was also observed up to 90 km E of Mayotte in late October 2019 and consistently between August 2019 and February 2020.

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