A small tsunami created by the quake was barely noticeable in Craig, Alaska, where the first wave or surge was recorded Saturday night.
Fryer said it could take several hours for the danger to pass in Hawaii, especially if the waves get bigger.
"It's beginning to look like the evacuation may not have been necessary," Fryer said.
The warning in Hawaii spurred residents to stock up on essentials at gas stations and grocery stores and sent tourists in beachside hotels to higher floors in their buildings. Bus service into Waikiki was cut off an hour before the first waves, and police in downtown Honolulu shut down a Halloween block party.
Gov. Neil Abercrombie proclaimed an emergency, mobilizing extra safety measures.
While television traffic cameras showed onlookers at the beach in Waikiki, Honolulu Mayor Peter Carlisle warned people to stay away from the surf for several days.
Carlisle — who recommended people think about ditching their cars if they were in traffic — said people should be cautious.
"There's no reason to panic but there's every reason to take all of the necessary precautions," he said.
Coast Guard officials closed all harbors in the state to incoming boats and urged vessels to leave and not return until an all-clear is given.
"We don't have any reports of any tsunami impacts at this time, but we caution mariners because the tsunami surges can continue for several hours," Chief Warrant Officer Gene Maestas said.
In Kauai, three schools used as evacuation centers quickly filled to capacity.