according to the U.S. Geological Survey's Cascades Volcano Observatory. The swarm — hundreds of small earthquakes hitting the same area in quick succession — started around 1:30 a.m. local time ...

More than 400 earthquakes rattled Washington's Mount Rainier over just 12 hours on Tuesday, sparking fears that the ...

MT. RAINIER, Wash. — A swarm of small earthquakes was detected at Mount Rainier Tuesday morning, according to the U.S. Geological Survey Cascades Volcano Observatory (CVO) and the Pacific Northwest ...