The unexpected Mayotte 2018–2020 seismic sequence: a reappraisal of the regional seismicity of the Comoros

The Mayotte seismic sequence that started on 10 May 2018, with a main shock of magnitude Mw 5.9 15, followed by major offshore volcanic activity, raises several questions seismo-volcanic hazards in the Comoros region. unexpected size and duration crisis is an opportunity to reassess distribution seismicity near Island, but also regionally. We present comprehensive catalogue region including Mozambique Channel, coast Madagascar, based partly previously published data unpublished from local catalogues for Madagascar. Our extends 1900 onward completeness 5.5 until 1980s decreasing only recently 4.5 after 2010. It comprises events Mlv ≥3.5 2018 October 2020 as still ongoing. Present knowledge seismicity, largely partial before 1980, makes 2018–2020 exceptional unprecedented event discuss time space within context south eastward propagation East African rift system towards