A light, 4.7-magnitude earthquake struck in Northern California on Wednesday, according to the United States Geological ...

Volcano Watch” is a weekly article and activity update written by US Geological Survey Hawaiian Volcano Observatory scientists and affiliates. Note: The summit eruption of Kl ...

A new study on the supervolcano percolating underneath Yellowstone National Park reaffirms it’s not about to blow and end humanity as we know it. It ...

In the mid-1800s, the U.S. Department of the Interior began the “great surveys” to map the vast, uncharted land of the West, ...