Ground deformation monitoring of the eruption offshore Mayotte

In May 2018, the Mayotte island, located in the Indian Ocean, was affected by an unprecedented seismic crisis, followed by anomalous on-land surface displacements in July 2018. Cumulatively from July 1, 2018 to December 31, 2021, the horizontal displacements were approximately 21 to 25 cm eastward, and subsidence was approximately 10 to 19 cm. The study of data recorded by the on-land GNSS network, and their modeling coupled with data from ocean bottom pressure gauges, allowed us to propose a magmatic origin of the seismic crisis with the deflation of a deep source east of Mayotte, that was confirmed in May 2019 by the discovery of a submarine eruption, 50 km offshore of Mayotte ([Feuillet et al., 2021]). Despite a non-optimal network geometry and receivers located far from the source, the GNSS data allowed following the deep dynamics of magma transfer, via the volume flow monitoring, throughout the eruption

5 years of rainfall, discharge and suspended sediment concentration monitoring in three headwater catchments on volcanic soils in Mayotte Island (Indian Ocean)

Mayotte is located in the Mozambique Channel between Madagascar and Mozambique in the Indian Ocean, and is part of the Comoros archipelago. A hydro-sedimentary observatory was installed on three coastal catchment representative of the morphology, geology and land use observed on the island of Mayotte: the Mtsamboro catchment (19 ha), the Dzoumogné catchment (343 ha) and the Salim Be catchment (534 ha). For each watershed, the monitoring is composed of a hydrological and sedimentary station at the outlet and two climatic stations, located upstream and downstream of the basin. Rainfall, discharge and suspended sediment concentration data were recorded between November 2015 and August 2020 at 2-minute time steps. The data is available with a time step of one hour, one day and one month

Characteristics and health of homeless families: the ENFAMS survey in the Paris region, France 2013

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