https://lejournaldemayotte.yt/un-seisme-de-magnitude-47-ce-matin-a-11h24/

BRGM confirms a magnitude of about 4.7 (Mlv=4.8; Mlh =4.7) for the earthquake of 9th January 2019 at 11:24 local time (08:24 UTC). Pga on YTMZ 3.55 mg.
The location is in accordance with the active zone located between 30 and 35 km from Mamoudzou. The last earthquake felt in Mayotte with a magnitude greater than 4 on the Richter scale was on December 30.