Since May 2018, Mayotte, a volcanic shield three times smaller than Martinique and with 270,000 inhabitants, has been experiencing sustained seismic activity. The appearance of what seismologists call a “swarm of earthquakes” was surprising, as seismicity in the Mozambique Channel is usually moderate. “This activity is distinguished from a main tremor followed by smaller aftershocks, felt earlier in Mayotte,” notes the Bureau of Geological and Mining Research (BRGM).
The analyses carried out by this office, the Institut de physique du globe de Paris (IPGP), the Observatoire des sciences de la Terre (CNRS/Université de Strasbourg) and the Observatoire volcanologique du Karthala (Grande Comore) have already led to a better interpretation of seismic signals. Increasing seismic activity but too low to generate tsunamis.