Russia’s magnitude 8.8 earthquake spawned serious tsunami warnings, but waves have been moderate so far. Here’s the geological reason why

One of the most powerful earthquakes in history triggered a tsunami that made landfall in Russia, Japan and the US.

A powerful earthquake struck Wednesday off Russia's Far East coast, flooding a fishing port with waves from a tsunami, cutting power to a few areas and sending some panicked residents fleeing buildings but causing only a few injuries.