Isla Calafia lies under 300 feet of water on the highest part of a huge underwater ridge.
American West Geology
The USGS, in partnership with the state of California and other institutions, has monitored Parkfield since 1985 to obtain a detailed record of fault behavior believed likely to culminate in a moderate earthquake.
The central part of Yellowstone has been uplifting and subsiding or “breathing” about five times during the last 9,000 years.
The safety of the proposed Nevada site has been debated for more than 10 years, primarily due to concerns about earthquakes and groundwater.
Nestled in south-central Colorado, Wheeler Geologic Area features pinnacles and spires formed from long-ago volcanic eruptions in the San Juan Mountains.