A magnitude 7 earthquake has struck Tonga this morning at 7.20am, authorities said.

No casualties or damage were reported after the quake, which struck out at sea at a depth of 206 kilometres with its epicentre at a distance of 22.9 kilometres south and 176.6 kilometres west.

Tonga Meteorological Services said it “was very deep”.

Reports from residents on social media showed the quake was felt in Tonga’s main island Tongatapu.