Modeling of the paleo-tsunami of Sturregg: Germany and Denmark avoided serious losses

• Scientists modeled the Sturegga tsunami 8150 years ago
• Germany and Denmark were almost unaffected by the wave
• Deposits in the region are associated with marine transgression
• The study is published in Quaternary Science Advances

About eight thousand years ago, a major underwater slope collapse off the coast of Norway led to an event known as Sturegga. This geological process triggered a powerful tsunami that, according to historical and geophysical data, struck the coastal areas of the North Sea.

Modeling the wave spread

A group of European researchers conducted numerical modeling of the tsunami dynamics, taking into account the seabed topography, depths, and the nature of the collapse. According to their calculations, the wave height in the central part of the North Sea could reach several meters, but its energy quickly dissipated as it moved towards the southeast coast.

Scientists paid special attention to the area where Germany and Denmark are located today. The analysis showed that the continental part of Europe, situated on the southeast coast of the North Sea, did not experience significant destruction. Models indicate that the height of the breaking waves in this region remained below threshold values capable of causing mass erosion or flooding.

Paleo-deposits and their interpretation

Previously, geological sections in Germany and Denmark contained layers of sediment that some researchers linked to the impact of ancient tsunamis. A new study offers a different perspective: these deposits were most likely formed as a result of marine transgression — a gradual rise in sea level, rather than a sudden tsunami.

The transgression could have been caused by post-glacial sea level rise, when melting glaciers led to an increase in sea level by several dozen meters. Such conditions favored the accumulation of marine deposits in areas that are now above sea level.

The publication of results in the journal Quaternary Science Advances emphasizes the importance of distinguishing between these processes. Misattributing deposits to tsunamis can lead to incorrect conclusions about the frequency and scale of such events in the past.

The significance of the research for modernity

Understanding the dynamics of ancient tsunamis and their impact on continental territories has practical implications for assessing modern risks. Although Sturegga occurred in prehistoric times, its consequences serve as an indicator of how large underwater landslides can generate waves capable of reaching distant shores.

Contemporary climate change and rising sea levels increase interest in such research. They help refine models of future scenarios, where potential landslides in Arctic and sub-Arctic regions could become sources of new tsunamis.

Thus, the new research clarifies the picture of the consequences of Sturegga, demonstrating that modern Germany and Denmark, despite their proximity to the North Sea, remained relatively protected from the destructive waves of that time.

Source: N+1