The largest ever earthquake swarm has been recorded at Washington's Mount Rainier, with officials saying there is no cause ...

Scientists are installing multiple temporary seismic monitoring stations to get a better understanding of the sharp increase ...

Small earthquakes have rocked the active volcano Mt. Rainier in the Cascade Mountain Range this month, sending shockwaves ...

PORTLAND, Ore. - An earthquake with a magnitude of 4.5 shook the Mount Hood area early Saturday but there were no reports of damage or injuries.

The last large earthquake swarm at Mount Rainier occurred in 2009 and lasted for three days. The swarm resulted in more than 1,000 earthquakes and the largest was of a 2.3 magnitude, according to ...