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MULTI-MAREX Launches Rapid Response Mission on Santorini

Writer's picture: Walter MenapaceWalter Menapace

Earthquakes are a routine occurrence in regions characterized by active faults, volcanism, and tectonic plate boundaries. This is also true in the Aegean Sea, where numerous geological phenomena shape its islands and seafloor. Starting on January 24, 2025, an increase in weak to moderately strong earthquakes has been recorded in and around Santorini, similar to the events observed in 2011 and 2012. Unlike the previous episode, however, the current seismic activity is concentrated on the seafloor between the islands of Santorini and Amorgos, with its center approximately 25 kilometers northeast of Santorini. In recent days, several hundred earthquakes have been documented.


These current tremors are predominantly caused by tectonic processes. The numerous fault zones on the seafloor are activated by tectonic stresses along the plate boundary between the African and Eurasian plates. These ongoing processes are the cause of the widespread volcanism in the region, including Santorini. Many people in the region perceive the shaking as mild vibrations; thus far, no significant damage has been reported. The strongest earthquake to date reached a magnitude of 5.1 on February 4 and occurred at a depth of about 10 kilometers.


Against this backdrop, MULTI-MAREX launched a Rapid Response Mission on February 2nd. Together with our Greek partners, we are on site to install instruments on the seafloor and in Santorini’s caldera to monitor the seismic activity.


The objective of the MULTI-MAREX monitoring efforts is to record and accurately quantify the number, location, and magnitude of the earthquakes. Over the coming days, we will be able to assess whether the recent increase in magnitudes and the intensity of the earthquake sequence will continue or diminish. As long as seismic activity persists, there is an elevated risk of landslides, particularly along steep coastal areas. Very strong earthquakes—significantly more intense than those recorded so far—could also generate tsunami waves. Potential warning messages from the Greek authorities are sent directly to mobile devices via cell broadcast, provided that emergency notifications are enabled.


Text Author: Prof. Dr. Heidrun Kopp

Image rights: (C) Dr. Roberto Benavides

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