A series of significant earthquakes that struck Greece’s Santorini Island in January has unveiled a complex and fiery subterranean connection between two adjacent and historically volatile volcanoes.
Recent analyses of seismic activity spanning from June 2024 to February 2025, alongside observations of shifts in the island’s surface elevation, indicate that the same reservoir of magma that fuels the Santorini volcano may also serve the submerged Kolumbo volcano, located a mere seven kilometers away. This groundbreaking discovery was reported on September 24 in the esteemed journal Nature.
According to geophysicist Marius Isken from the GFZ Helmholtz Centre for Geosciences in Potsdam, Germany, the existence of complex, shared magma plumbing systems can significantly complicate the interpretation of seismic events and indicators of potential eruptions. He and his fellow researchers emphasize the urgent need for real-time, high-resolution monitoring systems to enhance volcanic activity warnings.
Santorini is notorious for a catastrophic eruption around 1560 B.C. that is believed to have played a crucial role in the downfall of the Minoan civilization, causing widespread devastation through earthquakes, tsunamis, and potentially inducing a volcanic winter. Kolumbo, its less-celebrated counterpart, most recently erupted in A.D. 1650.
In early January 2024, a swarm of over 1,200 earthquakes rocked the region, prompting Greece to declare a state of emergency amid fears of an impending eruption. Although no eruption materialized, the extensive seismic activity provided Isken and his colleagues an invaluable opportunity to investigate the subsurface dynamics of the area and gain insight into magma movement.
Employing data from earthquake monitoring stations on both the land and ocean floor, the research team meticulously reconstructed the seismic events leading to the unrest. Starting in July 2024, Santorini’s surface exhibited a swelling of several centimeters, indicating magma accumulation in its shallow reservoir sourced from deeper within the Earth’s crust. The swelling correlated with seismic activity concentrated around Santorini.
On January 27, the frequency of earthquakes surged dramatically, with a new seismic swarm migrating over several weeks, initially directed toward Santorini and subsequently northeastward away from the island. Concurrently, GPS data revealed that both volcanoes appeared to undergo deflation.
This sequence of seismic events and ground settling suggests a significant magmatic connection between the deeper reservoir and both Santorini and Kolumbo. The earthquakes indicated that magma was migrating from this reservoir, first toward Santorini, and then retreating from both volcanoes, effectively causing both to exhale in a synchronized deflation.
This represents a groundbreaking first observation confirming a magmatic link between Kolumbo and Santorini. According to the research team, this discovery holds substantial implications for other extensive volcanic systems postulated to share similar magmatic plumbing or influence one another beneath the surface, including volcanic systems in Hawaii, Iceland, and Kamchatka Peninsula in Russia.
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