The Pacific Tsunami Warning Centre says a 6.2 earthquake shook American Samoa early this morning.
It says the quake was 147 nautical miles off American Samoa's main island of Tutuila
Oceanographer at the centre, David Walsh, says the quake did not generate a tsunami.
There have been no reports of damage.
Meanwhile, Samoa's met office says the quake, which was 171 kilometres south southwest of the capital, Apia, was the strongest felt there this year.