Axial Seamount, an underwater volcano located roughly 300 miles off the Oregon coast, is showing signs that it may erupt before the end of 2025. Scientists have been monitoring the volcano closely since it last erupted in 2015, and recent data indicates the seafloor around it is inflating at a faster rate than it did before its previous eruptions in 1998, 2011, and 2015. The volcano sits along the Juan de Fuca Ridge, where two tectonic plates are pulling apart, and it is one of the most closely watched underwater volcanoes in the world.

While eruptions at Axial Seamount are not typically explosive, they do reshape the ocean floor and release pressure from deep beneath the surface. The primary risks associated with an eruption include potential damage to underwater cables and sensors, as well as the possibility of shock waves traveling through the ocean. There is also a broader concern among researchers about how such activity might interact with the Cascadia subduction zone, a fault line that has the capacity to produce a major earthquake in the Pacific Northwest.

Axial Seamount is one of the few volcanoes in the world equipped with instruments directly on the seafloor. These sensors track ground movement, temperature, and chemical changes in the water, giving researchers a warning system that other volcanoes lack. Despite this technology, predicting the exact timing of an eruption remains difficult, and coastal communities may have little time to react if one occurs suddenly. The volcano inflates like a balloon as magma rises, and that pattern has been observed consistently ahead of past eruptions.

Oregon’s volcanic landscape extends well beyond the ocean floor. Mount Hood, the state’s highest peak at over 11,000 feet, is considered the most likely volcano in Oregon to erupt next. The mountain last experienced a major eruption in the 1700s, and minor steam explosions and gas releases have been recorded since then. Geologists have detected earthquakes beneath its slopes, which they interpret as signs that magma may still be moving underground. Roughly one million people live within an area that could be affected by an eruption, and Portland sits about 50 miles away, placing it in the path of ashfall if prevailing winds shift. Even a smaller eruption could send ash into the atmosphere and disrupt air travel across the Pacific Northwest.

Crater Lake, another of Oregon’s most recognizable landmarks, also carries an active volcanic system beneath its surface. The lake formed more than 7,000 years ago when Mount Mazama erupted violently, emptied its magma chamber, and collapsed inward. The resulting caldera eventually filled with rain and snow, creating the deepest lake in the United States at more than 1,900 feet. Mount Mazama is considered dormant rather than extinct, meaning it still has the potential to erupt again. Seismic activity has been recorded in the area, and a future eruption could cause landslides, ashfall, and lava flows that might damage roads, block rivers, and force evacuations in southern Oregon.

The Newberry volcano in central Oregon is also classified as active. It has not erupted in over a thousand years, but geologists say future activity is possible. The region around it includes towns, highways, and recreational sites, and an eruption could send lava flows, ash, and gases across a wide area. The Lava River Cave near Bend, the longest lava tube in Oregon, was formed by an eruption from this volcano thousands of years ago and stands as a visible reminder of the forces that shaped the region.

Other geological features along Oregon’s coast highlight the ongoing interaction between land and ocean. Thor’s Well, near Cape Perpetua, is a collapsed sea cave roughly 20 feet deep that draws water in from beneath and forces it upward during high tide and storms. The surrounding rocks are often wet and slick, and sudden waves can sweep across the area with little warning, creating hazardous conditions for visitors who get too close.

Cape Kiwanda has seen a number of sinkholes open in its sandstone cliffs in recent years, including one that appeared near a popular walking path in 2023. The soft sandstone is shaped by wind, waves, and rain, and underground cavities can cause the surface to collapse without warning. Local authorities have added warning signs and barriers, but the process of erosion is difficult to predict.

Devil’s Punch Bowl, near Otter Rock, was formed when two sea caves collapsed, leaving a large bowl open to the sky. The same wave action that created the feature continues to erode the surrounding cliffs. Rising sea levels and stronger storms may accelerate this process, potentially threatening nearby trails and infrastructure.

The Oregon Vortex, located near Gold Hill in southern Oregon, presents a different kind of geological curiosity. The site gained attention in the 1930s when a geologist named John Litster studied unusual physical sensations and apparent gravitational anomalies on the property. A tilted building called the House of Mystery sits at the center of the attraction, where balls appear to roll uphill and visitors report changes in their apparent height. Some scientists attribute these effects to optical illusions and warped perspective, while others point to erratic compass readings and unusual geology in the area.

One of the less visible threats to Oregon’s ecosystem is a fungus known as Armillaria ostoyae, which spreads beneath the forest floor in the Malheur National Forest. The organism covers more than three and a half square miles and is believed to be over 2,000 years old, making it the largest known living organism on Earth. It exists mostly underground as thin threads called mycelium, occasionally revealing itself through clusters of honey-colored mushrooms. The fungus invades the roots of living trees and slowly kills them, and entire groves of conifers have been lost in the region over the years. Because it lives underground, it is difficult to treat, and infected areas may need to be cleared and left untouched for years before replanting.

Deep beneath the ocean, a site called Pythia’s Oasis has also drawn scientific attention. Located along the Cascadia subduction zone, this deep-sea vent leaks warm mineral-rich fluid from beneath the Earth’s crust. Researchers are studying whether the amount of fluid escaping could affect how the fault behaves, noting that a fault that loses too much fluid may become more locked and capable of storing more energy before releasing it.

Oregon’s landscape has been shaped by volcanic activity, coastal erosion, and underground biological processes for thousands of years. Axial Seamount remains the most immediate concern among scientists due to its known eruption patterns and the advanced monitoring systems in place. While the volcano is far from shore, it is part of a broader tectonic system that includes the Cascadia subduction zone, and researchers continue to study how these forces interact. The state’s geological and ecological monitoring programs are among the most developed in the country, but the forces at work remain difficult to predict with precision.