Oregon’s Three Sisters volcano complex is showing signs of increased activity as magma moves beneath the surface, raising ...

The Three Sisters Volcano, located in the Pacific Northwest of the United States, is undergoing an intriguing geological ...

Very few places on Earth pack so much volcanic variety than the Three Sisters region. You can find basaltic andesite lava flows and cinder cones, giant composite volcanoes (three of them!), rhyolite ...

PORTLAND, Ore. (KOIN) — An Army National Guard HH-60 Black Hawk helicopter was called in to help rescue two men stranded on Oregon’s South Sister volcano on Tuesday. The men, 19 and 20 years ...

Slightly to the south of McKenzie Pass, scientists have been keeping an eye on ground uplift just to the west of South Sister Volcano. That uplift started in the mid-1990s and slowly tapered off ...

What’s next? Lava is erupting from several volcanoes, including one in Hawaii. Nearly 50 volcanic eruptions have been recorded this year, and more are expected. The Axial Seamount, an underwater ...