A new study is fueling speculation and fear about the risks of a major earthquake in the Cascadia subduction zone, including massive flooding in California

The Cascadia subduction zone could pose a major threat to the West Coast if a high magnitude earthquake were to occur, flooding coastal regions.

The next great earthquake isn't the only threat to the Pacific Northwest. A powerful earthquake, combined with rising sea levels, could significantly increase flood risks in the Pacific Northwest, impacting thousands of residents and properties in northern California,