Eruption at a newly-discovered underwater volcano, located about 50 – 60 km (31 – 37 miles) east of Mayotte, Indian Ocean continues with increased seismicity and associated deformations.
During the month of August, REVOSIMA detected 361 volcano-tectonic earthquakes detected, 198 long-period earthquakes, and 10 very long-period earthquakes.
Of those, only 2 were felt by residents of Mayotte — M4.1 on August 3 and M3.8 on August 26.1
The main seismic activity is still concentrated 5 to 15 km (3 – 9 miles) east of Petite-Terre, at depths of 20 to 50 km (12 – 31 miles), REVOSIMA reports.
Surface movements measured by GPS stations in Mayotte since July 1, 2018, indicate:
a) an overall movement of the GPS stations from Mayotte to the east of approximately 21 to 25 cm (8 – 10 inches),
b) subsidence of approximately 10 to 19 cm (4 – 7.5 inches) depending on their location on the island. Since the end of 2020, deformations have become negligible.
The volume of erupted magma is estimated at approximately 6.55 km3 (1.6 miles3) as of April 2021.
1 Bulletin de l’activité sismo-volcanique à Mayotte – No.33 – September 1, 2021 – REVOSIMA – IPGP
Featured image credit: REVOSIMA
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