
© Peter Giovannini / GETTY IMAGESAll’s quiet onshore. Mayotte’s main island, Grande Terre.
Scientists are unravelling the dramatic events that created a huge underwater volcano off Mayotte in the Indian Ocean in 2018 - an event not confirmed until the following year.An international team led by Simone Cesca from Germany's GeoForschungsZentrum (GFZ) is reconstructing the partial emptying of what it says is one of the deepest and largest active magma reservoirs ever discovered in the upper mantle.
And, the researchers
report in the journal
Nature Geoscience, it's rather as they expected.
Mayotte's two islands are part of the Comoros archipelago, which lies between Africa and Madagascar.
Unusual seismic activity in the area began with a swarm of thousands of "seemingly tectonic" earthquakes, the researchers say, culminating in an earthquake of magnitude 5.9 in May 2018.
From June, however, a new form of earthquake signal emerged and the 20-to-30-minute signals - known as Very Long Period (VLP) signals - are so strong that they can be recorded up to a thousand kilometres away.
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