HONOLULU: Authorities say a strong earthquake has hit off the coast of the Northern Mariana Islands near Saipan in the northwestern Pacific Ocean.

The US Geological Survey says the magnitude-7.7 earthquake struck at just after 7 am Saturday (11 am Hawaii Standard Time on Friday) at a depth of 117 miles (188 kilometers). The Pacific Tsunami Warning Center says there's no threat of a destructive Pacific tsunami and no danger to Hawaii, Alaska or the West Coast of the US.

There are no initial reports of damage or injuries on the Northern Mariana Islands, a commonwealth of the United States. Saipan is the capital and the largest island in the archipelago.