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Mount Rainier, one of the most dangerous volcanoes in the U.S., has been rocked by over 1,000 earthquakes since July 8 — the largest swarm ever recorded at this massive stratovolcano. While most of the quakes are too small to feel, scientists at the USGS are puzzled by the swarm's unusual length and intensity. Could this be a sign of something bigger brewing beneath the surface?

In this video, we break down what’s happening under Mount Rainier, why experts are watching it closely, and what an eruption could actually look like. Plus, we take a look at another restless giant — the Axial Seamount — which might be just days away from an underwater eruption.

This is a wake-up call from the Pacific Northwest’s volatile volcanic zone
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Transcript
00:00Mount Rainier, one of the most dangerous volcanoes in the United States,
00:04is rumbling like never before.
00:06Over 1,000 earthquakes have shaken the mountains since July 8th.
00:10This isn't just rare.
00:11It's the largest earthquake swarm ever recorded at Rainier.
00:15The U.S. Geological Survey says most of these quakes are too small to feel.
00:19But experts admit they have no idea how long this will last.
00:23Usually, these swarms fade after a few days.
00:26This one has lasted weeks.
00:27While there's no sign an eruption is about to happen,
00:31Mount Rainier is still very much active.
00:33And it's dangerously close to major cities like Seattle and Tacoma.
00:37If it erupts, it's not lava we need to fear.
00:40It's lahars, fast-moving volcanic mudflows that can wipe out entire towns in minutes.
00:46The biggest concern?
00:48Scientists say the tremors are likely from water moving above the magma.
00:52Which means something is stirring below.
00:53And just 240 miles away, another volcano, Axial Seamount, is shaking too.
00:59Could the Pacific Northwest be waking up?
01:02Time will tell.
01:03But the ground is definitely talking.

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