"It's not one that's going to cause mass devastation. But it will cause coastal flooding and it will cause damage and it does put lives at risk if people don't move to high ground," an oceanography professor says.

Two million people are told to evacuate in Japan after an 8.8 magnitude earthquake, one of the strongest ever, hits Russia's eastern coast.

ABC News foreign correspondent Britt Clennett says Japan is being extra cautious due to the country's history with earthquakes and tsunamis — referencing the 2011 Fukushima disaster.