More of Mercer Island may be vulnerable to hazards like landslides and earthquake damage than previously thought, according to a new geologic map of the island developed by a University of Washington ...

If pinnacles are, for you, a peak experience, and if basalt makes your blood flow like a rambling lahar, you’ll want to pick up “Washington Rocks! A Guide to Geologic Sites in the Evergreen State.” ...

Eastern Washington residents may know Sun Lakes — Dry Falls State Park as a hidden treasure, but now the rest of the world is also getting a heads up. The International Union of Geological Science, ...

On a map, the Channeled Scablands look like a couple of melting gray jellyfish draped across Eastern Washington. The jellyfish have fat and skinny tentacles that flow southwest from Spokane, wrapping ...