A map showing seismic speed in Earth’s crust at 125 miles (201 km) depth across the continental U.S. and portions of Central America and Canada. The North American craton (outlined in black ...

The awe-inspiring Hells Canyon runs along the border of Idaho and Oregon in the United States. Ten miles wide and about 2,400 metres deep, it is North America’s deepest river gorge (pictured ...

A map produced by the authors of a new study in Nature Geoscience shows the relative seismic velocity of material that is 200 kilometers below Earth’s surface and located around the base of the ...