Editing Mayotte (section)

=== Geology ===
{{main|Geology of Mayotte}}
[[File:2019-03-08-Mayotte-Bathymetry-EQs-Section.png|thumb|right|Topography of Mayotte]]
[[File:Dziani Dzaha in Volcanic Crater in Mayotte.jpg|thumb|[[Dziani lake]] is the result of an ancient [[volcano]] that went extinct approximately 500,000 years ago.]]

Mayotte is a primarily volcanic island rising steeply from the bed of the ocean to a height of {{convert|660|m|ft}} on Mont Bénara ([[OpenStreetMap]] gives this as {{Convert|661|m|ft}}).

Two volcanic centres are reported, a southern one (Pic Chongui, {{Convert|594|m|ft}}) with a breached crater to the NW, and a northern centre (Mont M'Tsapéré, {{Convert|572|m|ft}}) with a breached crater to the south-east. Mont Bénara is on the curving ridge between these two peaks, approximately at the contact point of the two structures. Volcanic activity started about 7.7&nbsp;million years ago in the south, ceasing about 2.7&nbsp;million years ago. In the north, activity started about 4.7&nbsp;million years ago and lasted until about 1.4&nbsp;million years ago. Both centres had several phases of activity.<ref name="Volcano Discovery">[https://www.volcanodiscovery.com/mayotte-island.html Volcano Discovery] {{Webarchive|url=https://web.archive.org/web/20190723071200/https://www.volcanodiscovery.com/mayotte-island.html |date=23 July 2019 }}.</ref> The most recent age reported for an ash band is 7000 year BP.<ref name="Zinke2003" />

==== Earthquake swarm ====
The [[November 11 2018 seismic event|November 11, 2018, seismic event]] occurred about {{Convert|15|mi|km}} off the coast of Mayotte. It was recorded by seismograms in many places, including [[Kenya]], Chile, New Zealand, Canada, and Hawaii located almost {{Convert|11000|mi|km}} away.<ref name=forbes/> The seismic waves lasted for more than 20 minutes, but despite this, no one felt it.<ref name=forbes>{{cite magazine|url=https://www.forbes.com/sites/trevornace/2018/12/03/strange-waves-rippled-across-earth-and-only-one-person-spotted-them/#20938576aaab |title=Strange Waves Rippled Across Earth And Only One Person Spotted Them |first=Trevor |last=Nace |access-date=2019-01-26|magazine=[[Forbes]] |date=2018-12-03}}</ref><ref name=bigthink>{{cite web|url=https://bigthink.com/surprising-science/mystery-seismic-wave?rebelltitem=1#rebelltitem1|title=An unexplained seismic event 'rang' across the Earth in November |first=Robber |last=Berman |access-date=2019-01-26|date=2018-11-29|publisher=The Big Think Inc.}}</ref>
Subsequently, the earthquake swarm has been linked to a newly discovered undersea volcano located {{Convert|50|km|mi|abbr=on}} away from Mayotte at a depth of {{Convert|3500|m|ft|abbr=on}}.<ref>{{Cite news |date=17 May 2019 |title=Mayotte quake swarm linked to newly discovered undersea volcano |url=https://africatimes.com/2019/05/17/mayotte-quake-swarm-linked-to-newly-discovered-undersea-volcano/ |publisher=Africa Times (AT Editor) |access-date=13 April 2021 }}{{Dead link|date=July 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>