A mile-wide underwater volcano known as Axial Seamount, located approximately 300 miles off the Oregon coast, is showing signs of an imminent eruption. Situated about 4,900 feet beneath the Pacific Ocean’s surface on the Juan de Fuca Ridge, this submarine volcano has a history of erupting roughly every decade, with previous eruptions recorded in 1998, 2011, and 2015. Recent observations indicate that the seamount is more inflated with magma than before any prior eruption, and a rise in seismic activity supports predictions of an impending eruption.
Axial Seamount is formed by a geological hot spot at the intersection of the Pacific and Juan de Fuca tectonic plates. This unique positioning results in plumes of molten material rising into the crust, creating chains of volcanoes over time. The current inflation of the volcano’s summit, surpassing levels observed before previous eruptions, suggests that magma is accumulating at a significant rate. Scientists anticipate that the eruption could occur before the end of 2025.
Despite its size and activity, an eruption of Axial Seamount is not expected to pose a threat to coastal communities. Given its depth and distance from the shore, any eruption would likely go unnoticed by the public and would not trigger tsunamis or affect land-based areas. Instead, the event presents a valuable opportunity for scientists to study volcanic activity at mid-ocean ridges. The eruption process typically begins with increased earthquakes, followed by magma surfacing and lava flows extending up to 25 miles.
One of the intriguing aspects of Axial Seamount’s eruptions is the phenomenon known as “snow blowers.” During an eruption, hydrothermal vents release plumes containing billions of microbes and their waste products, creating a snow-like appearance in the water. These events offer insights into the unique ecosystems that thrive in extreme underwater environments and the geological processes that support them.
The University of Washington’s Ocean Observatories Initiative Regional Cabled Array plays a crucial role in monitoring Axial Seamount. This network of sensors on the seafloor and throughout the ocean waters provides real-time data on seismic activity, temperature, and other critical parameters. Such continuous monitoring enables scientists to observe the volcano’s behavior closely and improve their understanding of submarine volcanic processes.
As researchers await the anticipated eruption, the data collected will contribute to a broader comprehension of volcanic activity beneath the ocean. Studying Axial Seamount’s behavior not only enhances our knowledge of submarine volcanoes but also aids in developing predictive models for volcanic eruptions, which can be applied to other regions worldwide. The forthcoming eruption, while not hazardous to humans, represents a significant event in the field of geoscience.
