SEATTLE — (AP) — Officials are tracking the largest swarm of earthquakes in more than 15 years on Washington's Mount Rainier ...

Mount Rainier was experiencing "the most significant seismic activity" at the volcano in more than 15 years as an "earthquake ...

The U.S. Geological Survey said it and other agencies were monitoring the situation and would issue additional alerts "as needed." ...

MOUNT RAINIER, Wash. — A swarm of small earthquakes was detected at Mount Rainier Tuesday morning, according to the U.S.

Mount Rainier is an active stratovolcano 45 miles southeast of Tacoma and 60 miles south-southeast of Seattle. Its last ...

Mount Rainier saw a swarm of hundreds of small earthquakes that started early Tuesday morning.The activity began just before 1:30 a.

Known as Arsia Mons, the volcano dwarfs Earth’s tallest volcanoes. Odyssey, which launched on its mission about 24 years ago ...

USGS Cascades Volcano Observatory Open House Saturday, May 10, 2025; 10:00am-4:00pm Located on the east side of Vancouver, WA, in Columbia Tech Park 1300 SE Cardinal Ct. Building 10, Suite 100 ...

A large crowd is expected. The USGS Cascades Volcano Observatory is in an office park in east Vancouver, off Southeast 15th Street, at 1300 S.E. Cardinal Court, Building 10, Suite 100.

Iezzi's team with the USGS Cascades Volcano Observatory monitors the Cascades daily. Their infrasound and seismic sensors detect cracks and movement from below as magma is forced upward.

Geophysicist Michael Poland of the U.S. Geological Survey’s Cascades Volcano Observatory in Vancouver, Wash., agrees.