The quake, initially reported as a magnitude 6.8, struck at 5:49 a.m. on Thursday (1849 GMT on Wednesday). Its epicentre was 109 miles (175 km) southeast of Gizo.
The Pacific Tsunami Warning Centre said the quake, which was shallow at a depth of only 24.3 miles (39 km), had not triggered a tsunami.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.