Video
A powerful magnitude 8.8 megaquake struck beneath the Kamchatka Peninsula in July 2025, sending shockwaves across the Pacific Ocean. But hours later, something unusual began in the Cascade Range of the Pacific Northwest. From Mount Baker to Mount Shasta, seismic stations detected faint, rhythmic pulses beneath multiple volcanoes — including Mount Rainier, Mount St. Helens, Mount Hood, and the Three Sisters.
Scientists are now investigating whether these strange tremors are harmless echoes or signs of a deeper connection between megaquakes and volcanic activity across the Ring of Fire. With the Cascadia Subduction Zone already considered one of the most dangerous faults in North America, the possibility of linked seismic and volcanic events has researchers on high alert.
In this video, we explore what these mysterious signals mean for the Cascades, why Mount Rainier is considered the U.S.’s most dangerous volcano, and how stress along the Pacific Plate may be awakening dormant systems worldwide.
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