Add “sinking below sea level” to California’s list of natural disaster worries. Portions of the Golden State could be at risk of abruptly dropping into the sea during a severe earthquake like the “Big One” scientists have been predicting for years, according to a study published Monday.

By assessing seismic activity, scientists have estimated in the past that a massive earthquake should strike California along the 800-mile San Andreas Fault line once every 150 years, meaning the hotspot should see one very soon. Now they’ve forecast that — along with the devastation the earthquake itself would cause — portions of the state could very possibly plummet below sea level.

“It’s something that would happen relatively instantaneously,” Matt Kirby, a California State University, Fullerton professor who worked on the study, told Reuters. “Probably today if it happened, you would see seawater rushing in.”

The study, published in the journal Scientific Reports by researchers from Cal State Fullerton and the United States Geological Survey, analyzed data that showed previous earthquakes caused portions of the Long Beach coastline to sink suddenly by 1 1/2 to 3 feet. Should something similar happen today, the area could end up below sea level.

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