A long-feared monster earthquake off the coast of California, Oregon and Washington could cause some areas to sink by more than 6 feet, dramatically heightening the risk of flooding.

A study warns that a massive earthquake along the Cascadia subduction zone could cause significant land sinking, increasing flood risks in coastal areas from Northern California to Washington.

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