The epicenter of the quake was in the sea, 133 km southwest of Lahomi town, West Nias, at a depth of 10 km, the office said in a written statement.
The quake was a shallow one and caused by tectonic activity in the outer-rise zone, BMKG added.
No material damages or casualties were reported in the quake.
Related news: 5.2-magnitude quake jolts North Sulawesi's Bitung
Related news: 6.7-magnitude quake hits East Java's Malang district
Translator: Juraidi/Suharto
Editor: Gusti Nur Cahya Aryani
Copyright © ANTARA 2021