Looking ahead 100 million years, new research puts a maximum limit of 3.6 meters per second on potential ground movement caused by earthquakes at Yucca Mountain, Nevada, the site of the proposed high-level radioactive waste repository. Yucca Mountain has unique characteristics that make it arguably the best location to store hazardous waste, chiefly a water table so low that it is possible to store steel canisters of waste 1000 feet below ground and 1000 feet above the water table. Two questions form the current debate: how dry will the site remain, and what is the risk from earthquakes?