The earthquake took place at a depth of 30 kilometres about 11.10am, about 133 kilometres from Solomon Islands' capital Honiara, the USGS reported.
A USGS spokesman said that, while the undersea quake had struck at a shallow depth, the lower magnitude of the quake combined with its occurrence "on the lower part of the earth's crust" meant a tsunami affecting the Pacific region was unlikely.
But the spokesman added that a local tsunami was possible. He said the USGS had not received any reports of damage or casualties.
Nelson Anaia, a provincial disaster officer at the Solomon Islands' National Disaster Management Office, said there was no threat of a tsunami and everything was "normal".
A Bureau of Meteorology spokesman said there was no tsunami threat to Australia. Read More