Earthquakes of magnitude 3 or greater are 100 times more likely now than in 2008 in regions of Colorado and seven states that are hotbeds for oil and gas drilling, federal geologists said Wednesday.
This has prompted the government to prepare new seismic-risk maps for construction, insurance and public safety.
The question of who bears the costs of possible damage and quake-resistant construction has yet to be decided. But a U.S. Geological Survey team, based in Colorado, also has started a series of meetings with engineers and designers.