The Solomon Islands has been rocked again with a magnitude 6.9 earthquake striking just off the coastline.

The quake struck 90 kilometres west south west of Kirakira at a depth of 10km at 8.44am NZT, and comes just a day after a 7.8 earthquake destroyed homes and triggered a tsunami warning.

The United States Geological Survey initially reported it as a 7.0 magnitude earthquake but has since downgraded it to 6.9.

The Ministry of Civil Defence and Emergency Management says there is no tsunami threat to New Zealand following the 7.0m earthquake.

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Friday's 7.8 earthquake, which struck at 6.38am NZT, was centred about 70km south-west off Kirakira at a depth of 40km, causing buildings to collapse and some small tsunami waves in the Solomon Islands and other Pacific islands. There were no reported deaths.