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Santorini Earthquake Updates: What Scientists Found at the Caldera’s Seafloor – Lakes, Vents, and Rock Formations

March 22, 2025

Is There a Risk of a Tsunami?

Professor Evi Nomikou, a geology expert at the National and Kapodistrian University of Athens (EKPA), provided an update on Santorini’s seismic activity during an appearance on Action24 on Wednesday, March 12. A month and a half after a seismic sequence shook the broader Cyclades region between Santorini and Amorgos, the situation has significantly improved.

Due to poor weather conditions, researchers have been unable to conduct further investigations at the Kolumbo underwater volcano. However, a remotely operated vehicle (ROV) has already surfaced with images from the Santorini Caldera’s seafloor.

“We have discovered extensive submerged lakes—areas where carbon dioxide and methane have accumulated—on the northeastern side of Santorini, at depths of approximately 200–300 meters,” Professor Nomikou explained.

Additionally, explorations at Aspronisi have revealed small hydrothermal vents emitting gas at a temperature of 34°C (93°F). More importantly, a network of scientific instruments has been deployed along the northern part of the caldera to measure rock density on the seafloor. This data will help researchers determine whether recent seismic activity has had any impact on Santorini’s underwater volcanic system.

Have the Earthquakes in Santorini Stopped?

Seismologist Costas Papazachos recently stated that the seismic sequence has largely concluded. However, he cautioned against assuming that all activity has completely ceased, emphasizing that ongoing monitoring remains crucial.

Clarifying the Tsunami Risk

Addressing concerns about a potential tsunami, Professor Nomikou reassured the public:

“There is no such risk. These are purely academic studies conducted within university research programs. As of now, seismic activity northeast of Santorini has significantly subsided. The earthquakes we are detecting are very small and have drastically decreased in frequency.”

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