Beneath the surface of the United States, the Earth's crust is slowly sinking, creating a new geological phenomenon.

Seismic mapping of North America has revealed that an ancient slab of crust buried beneath the Midwest is causing the crust ...

Could the grand canyon hide evidence of ancient earthquakes? The post Could the Grand Canyon Hide Evidence of Ancient ...

Rising north of Butte, east of Deer Lodge, south of Highway 12 between Helena and Garrison Junction, and west of the ...