Tuesday night, an 8.8-magnitude earthquake centered off the east coast of Russia prompted warnings of a tsunami for parts of Alaska and Hawaii, and while it looks like the worst threat has passed, concern is still there 24 hours later.

David Sun-Miyashiro was at home on the 31st floor of a Honolulu apartment building, high above danger, when his phone alerted him to a possible tsunami from a massive earthquake far across the Pacific Ocean.