(Portland, OR) -- Researchers at the University of Oregon are warning that if a massive Cascadia earthquake strikes the state, it's not just the tremor that residents should be worried about. A study published in "Proceedings of the National Academy of Sciences" predicts that such a quake could cause flooding over 100 miles inland. It warns that coastal lands could sink up to six-and-a-half feet. The study also predicted that rising sea levels as a result of climate change would only make a potential earthquake more dangerous.