Geology An earthquake nearly every day in the Rhineland

Bonn · After the quake in Italy, an expert says the earthquake risk in the Rhine region is underestimated.

Although people in Ahrbrück would not have noticed anything last Monday at 6.22pm, there was an earth tremor at exactly that time in the Ahrweiler district. Measurements taken at the earthquake centre in Bensberg, a research institute of Cologne University, showed a reading of 0.5 on the Richter scale. “People only notice anything when there is a reading of 2.5 or more,” says Iris Schwellenbach, who works at the station.

There are more than 40 measuring points in the Rhineland and the Eifel that show researchers the slightest movement. And the earth frequently moves here: since measurements were first taken in Bensberg in 1955, 2000 earthquakes have been recorded in north Rhineland and the surrounding areas. However, when a more severe earthquake may strike, cannot be predicted.

The main reason for the tectonic movements in the region is, according to scientists, a thinning of the earth’s crust in the lower Rhine bight. In parts of the Eifel, volcanic activity can also lead to an increase in earthquake risk. Mining activities in the Ruhr and around Cologne also cause small earthquakes.

But there are also cases of more severe earthquakes. Old records show there was a strong earthquake in 1756 in Düren. At 3.20am on 13 April 1992 many people in and around Bonn woke in fright. An earthquake measuring 5.9 could be felt far beyond its epicentre in Roermond. Around 30 people were injured and many buildings and cars were damaged.

“People in our region underestimate the earthquake risk,” believes the Bonn geographer Lothar Schrott. The risk in Germany is much less than in other countries but a single major incident could cause huge damage. “After 30 years, a natural catastrophe is usually no longer in people’s memories,” he says – a laughably short time for earthquake researchers.

The Bonn geographer also takes certain basic precautions at home: “I naturally always have food, candles and a battery-operated radio at home,” says Schrott. (Orig. text: Delphine Sachsenröder; translated by Kate Carey.)

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