A catastrophic 100-foot tsunami could strike the US West Coast at any moment — and scientists are sounding the alarm.

The Pacific Tsunami Warning Center has issued a threat forecast for Russia's Kamchatka Peninsula after two powerful earthquakes struck nearby on Sunday.

Officials in Hawaii issued a tsunami watch on Saturday evening as a series of earthquakes, including a 7.4 magnitude one, struck off the Russian coast, according to the U.S. Geological Survey.

Communities along a 700-mile stretch of Alaska’s southern coast ordered their residents to higher ground after a powerful earthquake, but officials quickly downgraded and then canceled a tsunami warni ...