A 5.1 magnitude earthquake struck near the island of Karpathos on Wednesday morning, June 24, 2026.
According to an automated reading by the Geodynamic Institute of the National Observatory of Athens, the tremor occurred at 11:25 AM local time. The epicenter was located approximately 7 kilometers south-southwest of Karpathos, with a relatively shallow focal depth of 10.0 kilometers.
The quake was felt across Karpathos and nearby islands in the Dodecanese complex, including Kasos, as well as parts of eastern Crete. Local authorities confirmed shortly after the event that there have been no immediate reports of structural damage or injuries.
Why is Karpathos and the Southern Aegean so seismically active?
The region encompassing Crete, Kasos, Karpathos, and Rhodes forms the eastern segment of the Hellenic Arc (or Aegean Arc). This is one of the most seismically active zones in the entire Mediterranean and all of Europe.
The driving force behind these earthquakes is a massive tectonic collision. The African Plate (beneath the Mediterranean Sea) is moving northward and sliding underneath the Aegean Sea microplate. The boundary where these two plates meet forms a deep underwater valley known as the Hellenic Trench, which curves just south of Crete and snakes right past Kasos and Karpathos up toward Rhodes.
Because the plates are constantly grinding against each other, stress builds up along the fault lines until it is suddenly released in the form of earthquakes.
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