What do you know about earthquakes near Santorini

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The accumulation of weak earthquakes to moderate to the Greek island of Santorini has been recorded since January 24. Seismic activity is concentrated in the area between the Santorini Islands and Amegeos, with a center of about 25 km northeast of Santorini.

GEOMAR HelmHoltz is classified as Ocean Kiel Research and GFZ Helmholtz Center for Earth Sciences Potsdam ongoing events in these questions and answers.

What is the cause of many earthquakes near the volcanic Santorini island?

Between santorini, underwater Kolumbo volcano, Amorgos, many earthquakes between 4 and 10 km depth for more than ten days. The size of the earthquakes up to the maximum or higher degree. The activity began with weak earthquakes under Santorini and moved northeast in recent days along the cortical weakness that extends from the southwest to the northeast.

These secrets are an earthquake that is not uncommon under active volcanic systems, as it has been repeatedly observed in the shadow of Santorini and Kolumbo (Bohnhoff Et Al. 2006). One of the possible causes is volcanic activity, that is, molten rocks or other liquids that rise up in the Earth's crust. Another possibility is the movement of the Earth's paintings, which can lead to pressure in the rock and the sudden release of these pressures and thus to earthquakes.

Also imagined mix: the individual parts of the tectonic plate Aega in the area surrounding Santorini are a few millimeters away from each other. This leads to the extension and mitigating the Earth's crust, similar to the dismantling of the difficult dough, which becomes thinner in the middle. Where the dandruff extends, liquids and fame can rise.

Is it possible to predict these earthquakes?

The date of the swarm of this earthquake cannot be predicted. There are allegiance phenomena, especially in volcanic earthquakes. We are currently looking at time development and accompanying changes in the swarm of the earthquake, such as height or landing.

Is it possible to predict a volcanic explosion?

Volcanic explosion also cannot be predicted. However, unlike earthquakes, volcanic bangs often have clear sponsorship phenomena. These include floor and earthquakes, which condense before the explosion and move towards the surface of the Earth or the bottom of the sea. To date, there is not enough data to warn of an imminent eruption. However, warnings to avoid slopes, for example, are correct and important.

What can happen in the case of a large eruption or earthquake like one in 1956?

In July 1956, Zalazlan occurred with sizes of more than 7 in the active area now. One of them occurred in the upper Earth's crust and caused a local tsunami with wave heights of up to 22 meters on the island of Amorgos. Earthquakes caused widespread damage to the area. Fifty people died. In the current earthquake chain, we see a much weaker earthquake. The rupture area of ​​1956 has not yet accumulated enough energy due to low displacement rates, but movements in other inactive rupture areas cannot be excluded.

If the earthquake similar to that in 1956 or a volcanic eruption (the last large eruption of the Colombo volcano occurred in 1650) will happen today, stronger effects can be expected due to the most intense population. Strong land may vibrate or cause buildings to collapse, especially old buildings or those that have not been created to be resistance to earthquakes. Tsunami can strike coastal areas and lead to floods, not only on Santorini, but also in the neighboring islands and Greek main righteousness. The landslide collapses can occur in Caldira. However, the probability of this is still low.

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Is the volcanic eruption on Santorini and an imminent?

The area below the santorini volcano is calmly quiet in terms of seismic. The last time there was a similar seismic activity that was there in 2011, with very shallow earthquakes at a depth of 1 to 2 km. However, there was no eruption.

What is the risk of tsunami there?

There is more tsunami in the Mediterranean Sea more than other regions in the world. About 80 % of the tsunami caused by strong earthquakes raising or lowering the sea floor – the tips can also occur in the Mediterranean Sea due to tectonic conditions.

The volcanic eruption in the area, such as Santorini volcano, can lead to a tsunami – whether it is through lower bangs or underwater landslides.

Volcanic operations can also cause landslides on Earth or underwater. This can replace large blocks of water and lead to tsunami. The Greek authorities and international researchers closely monitor the situation. We cannot exclude the possibility of a tsunami or a large earthquake.

How can these weak areas be monitored?

Thanks to modern monitoring systems, seismic activity and volcanic operations can now be noted. Greek earthquake service runs a dense monitoring network in the area also records small earthquakes. GEOMAR and GFZ and other partners launched a quick response task as part of the Multimarex project. Along with our Greek partners (physical geography laboratory, Athens University), we are at the site to install additional measurement tools on the sea floor and in Santorini Caldera and monitor seismic activity.

The goal of monitoring is to record and measure the number of earthquakes and their strength accurately. In the coming days, we will be able to realize whether the recent increase in the size and intensity of the earthquake sequence is continuing or declining.

What are the necessary measures to protect the population?

As long as the earthquake activity continues, there is an increased risk of landslides, especially on the sharp coastal departments. Therefore, people should avoid beaches and slopes. Very strong earthquakes – much more intense than that registered yet – can also lead to tsunami waves. There are currently no measurements indicating earthquakes of this size.

The Greek authorities send warnings in several languages ​​with the rules of behavior and preventive measures directly to mobile devices by broadcasting cells. To do this, you should activate the receipt of the emergency notifications.

It was presented by the Helmhulz Association for German Research Centers

Quote: Question and Answer: What do you know about earthquakes near Santorini (2025, February 6).

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