Authorities in the Solomon Islands said no tsunami warning would be issued after two earthquakes on Tuesday afternoon, including one with a magnitude of 7.0 just off the southwest coast, Reuters reported.
The first quake hit at a depth of 15 km (9 miles), about 16 km (10 miles) southwest of the area of Malango, said the United States Geological Survey, which had initially put its magnitude at 7.3.
A second quake, with a magnitude of 6.0, struck nearby 30 minutes later.
The Solomon Islands Meteorological Service said there is no tsunami threat to the country, but warned about unusual sea currents in coastal areas.
Widespread power outages are being reported across the island and the Solomon Islands Broadcasting said in a statement on Facebook that all radio services were off-air.