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Earthquake swarm

The November 11, 2018, seismic event occurred about 15 miles (24 km) off the coast of Mayotte. It was recorded by seismograms in many places, including Kenya, Chile, New Zealand, Canada, and Hawaii located almost 11,000 miles (18,000 km) away. The seismic waves lasted for more than 20 minutes, but despite this, no one felt it. Subsequently, the earthquake swarm has been linked to a newly discovered undersea volcano located 50 km (31 mi) away from Mayotte at a depth of 3,500 m (11,500 ft).