Axial Seamount is a remarkable underwater volcano situated off the coast of Oregon, drawing intense interest from the global scientific community. Recognised as the most active submarine volcano in the Northeast Pacific Ocean, Axial Seamount provides researchers with a rare opportunity to study submarine volcanism, tectonic activity, and potential geological hazards. Its eruptions can significantly affect the surrounding marine environment, including hydrothermal vents and local ecosystems. Scientists closely monitor the volcano using advanced sensors, seafloor observatories, and satellite data to track seismic activity and ground deformation. Recent studies indicate that Axial may erupt by mid-to-late 2026, although the precise timing remains unpredictable, highlighting the ongoing challenges of forecasting underwater volcanic events.
Axial Seamount: Underwater volcano on the Juan de Fuca Ridge
Axial Seamount is situated along the Juan de Fuca Ridge, a divergent tectonic plate boundary where the Pacific and Juan de Fuca plates are moving apart. This movement allows magma to rise from the Earth’s mantle and accumulate beneath the seafloor, creating volcanoes over time. Axial has a history of eruptions, including documented events in 1998, 2011, and 2015, making it a prime subject for studying submarine volcanic activity.Unlike surface volcanoes, submarine volcanoes like Axial are hidden beneath the ocean, making direct observation challenging. Scientists rely on a combination of seismic monitoring, ground deformation measurements, and underwater instruments to track activity. Monitoring Axial provides a rare opportunity to understand how underwater eruptions occur and how tectonic plate boundaries influence volcanic behaviour.
How scientists track Axial Seamount using seafloor inflation and earthquakes
Predicting when Axial Seamount will erupt involves studying ground inflation and seismic activity. Ground inflation refers to the rising of the seafloor caused by magma accumulating beneath the volcano. Seismic activity, measured through underwater earthquakes, indicates the movement of magma and the stress within the surrounding crust.Bill Chadwick, a research associate at Oregon State University, has been closely monitoring Axial. In December 2024, he and colleagues presented findings showing that eruptions at Axial tend to occur after a period of steady magma-driven inflation and heightened seismicity. Their research suggests that once inflation reaches a certain threshold, similar to previous eruptions, an eruption becomes likely.
Understanding inflation thresholds: How seafloor uplift signals an eruption
One key insight from monitoring Axial Seamount is the concept of inflation thresholds. These thresholds represent the amount of ground uplift needed to trigger an eruption. Interestingly, these thresholds appear to increase slightly with each eruption. For example, the 2015 eruption occurred after the seafloor had risen approximately 12 inches (30 centimetres) more than it had before the 2011 eruption.Currently, the seafloor is around 4 inches (10 centimetres) higher than it was prior to the 2015 eruption. This suggests that an additional 8 inches (20 centimetres) of uplift may be required before the next eruption. The increase in thresholds is thought to result from the compression of surrounding crust by rising magma, which makes it harder for magma to reach the surface in the same location repeatedly. However, the tectonic spreading at the Juan de Fuca Ridge gradually releases this stress, preventing indefinite increases in threshold.
Challenges in predicting submarine volcano eruptions
Despite advances in monitoring, forecasting submarine eruptions remains highly uncertain. The rate of magma accumulation, variations in inflation, and unpredictable seismic events all contribute to the difficulty. Chadwick emphasises that current predictions are based largely on pattern recognition and historical behaviour rather than precise science.To address these challenges, researchers are developing physics-based models that analyse historical monitoring data to predict eruptions. Starting in November 2025, real-time data from Axial Seamount will be used to test these models. However, the accuracy of predictions can only be verified after the next eruption occurs.Also Read | Are Earth’s oceans nearing collapse? NASA’s 2025 prediction warns of a potential 2050 climate disaster
