This is the dramatic moment waves crashed onto the Japanese coast after a megaquake struck Russia and triggered a tsunami warning. The magnitude 8.8 tremor struck off the eastern coast of Kamchatka at 11:25 am local time (UTC+12) on Wednesday,

"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.