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- Mount Rainer is rattled by more than 300 earthquakes. It's the largest swarm in years.</p>
<p>Greta Cross, USA TODAY July 11, 2025 at 1:51 AM</p>
<p>More than 300 earthquakes have erupted at Washington's Mount Rainier this week, the largest earthquake swarm at the volcano since 2009.</p>
<p>As of Thursday, July 10, 334 earthquakes had been identified at Mount Rainier by the Pacific Northwest Seismic Network (PNSN), Cascades Volcano Observatory Public Information Officer Holly Weiss-Racine told USA TODAY. The swarm, a cluster of earthquakes occurring in the same area in rapid succession, began in the early morning of Tuesday, July 8.</p>
<p>Scientists do not have any concerns about the earthquakes, the Cascades Volcano Observatory states. The largest so far was recorded at a magnitude of 2.3 on Wednesday, July 9.</p>
<p>Weiss-Racine said the rate peaked at 26 earthquakes per hour on the morning of July 8 and has decreased to "a few" per hour on the morning of July 10.</p>
<p>The PNSN is continuing to locate earthquakes a part of the swarm. Updates are shared on the PNSN website at pnsn.org/volcanoes/mount-rainier.</p>
<p>Is the earthquake swarm dangerous?</p>
<p>Mount Rainier in Washington is seen in June 2018.</p>
<p>The earthquake swarm is not dangerous to hikers on the mountain and has posed no indication for concern, the Cascades Volcano Observatory wrote in a news release.</p>
<p>As of July 10, the largest earthquake in the swarm was recorded at a magnitude of 2.3.</p>
<p>According to Michigan Technological University, earthquakes of a 2.5 or less magnitude are common – millions happen each year – and are not usually felt.</p>
<p>Earthquake guide: Earthquakes happen all the time, you just can't feel them.</p>
<p>Are earthquakes common at Mount Rainier?</p>
<p>About nine earthquakes per month are common at Mount Rainier, according to the Cascades Volcano Observatory. Earthquake swarms typically occur one or two times a year at the volcano but are not as large.</p>
<p>When was the last sizeable earthquake swarm at Mount Rainier?</p>
<p>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 the U.S. Geological Survey.</p>
<p>Can the earthquake swarm cause a volcanic eruption?</p>
<p>The Cascades Volcano Observatory states that Mount Rainier is not "due" for an eruption and no signs point to an eruption at this time.</p>
<p>But generally, earthquakes can be related to subsequent volcanic eruptions, according to the U.S. Geological Survey. However, the circumstances have to be just right.</p>
<p>For a volcano to be triggered into eruption by earthquakes, a volcano must have enough "eruptible magma" and significant pressure within its magma storage, the U.S. Geological Survey states.</p>
<p>When was the last time Mount Rainier erupted?</p>
<p>Mount Rainier hasn't had a major eruption, with strong geologic evidence, in the past 1,000 years, Weiss-Racine said.</p>
<p>Greta Cross is a national trending reporter at USA TODAY. Story idea? Email her at [email protected].</p>
<p>This article originally appeared on USA TODAY: Mount Rainier experiences more than 300 earthquakes in 2 days</p>
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