A massive underwater volcano, known as Axial Seamount, located nearly a mile beneath the ocean’s surface off the Oregon coast, is showing signs of a possible eruption. Situated along the Juan de Fuca Ridge, where tectonic plates are pulling apart, this volcano is experiencing increasing seismic activity as magma builds beneath it.

Researchers from the University of Washington, who monitor the volcano via the Ocean Observatories Initiative, report hundreds of small earthquakes occurring daily—an indicator that pressure is rising. “It could erupt tomorrow, or months from now,” said marine geophysicist William Wilcock.

Axial Seamount last erupted in April 2015, releasing magma across 25 miles of seafloor and causing over 10,000 tremors in a single day. During eruptions, white plumes known as “snowblowers” spew mineral-rich fluids from cracks in the caldera, supporting thriving ecosystems despite extreme conditions. Marine life, including fish and octopuses, feel the heat and movement but generally remain unharmed.

Unlike explosive land-based volcanoes, underwater eruptions like this one are quieter, with little visible impact above water. However, scientists plan to livestream the next eruption—a first in oceanic volcano observation.

Interestingly, all three of Axial Seamount’s recent eruptions happened between January and April, possibly influenced by lunar gravitational forces that increase tidal pressure on the seafloor.

Experts agree: while unpredictable, this underwater volcano offers a unique window into Earth’s geological processes and the resilience of life in harsh environments.