The epicenter of the quake that hit at 12:57 West Indonesia Standard Time (WIB) was located at sea, 30 kilometers southwest of South Nias, at a depth of 19 kilometers, the BMKG stated on its twitter account @infoBMKG.
According to the BMKG, the tremor was felt as far as Teluk Dalam, Gunung Sitoli, Padang Siempuan, and North Nias.
The agency also confirmed that the quake was followed by a 5.5-magnitude aftershock, centered 40 kilometers southwest of South Nias.
No immediate report of casualties or material damage was received.
Translator: Bayu Prasetyo, Suharto
Editor: Gusti Nur Cahya Aryani
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