Washington's Mount Rainier has suddenly awoken and is buzzing with almost nonstop activity

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The constant seismic rumblings were spotted by the Pacific Northwest Seismic Network (PNSN), where seismometers on Mount Rainier have recorded three straight days of nearly nonstop, high-energy seismic signals across the west flank of the volcano.

Unlike the seismic activity tied to major earthquakes, the patterns being seen in Washington look more like a volcanic tremor, a type of nonstop hum or roar that begins when magma, hot water, and gas moves around inside a volcano.

It doesn't mean Mount Rainier is going to erupt at any moment, but it is a warning sign that volcanic activity could eventually build towards a critical level.

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