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by bandibus
1522 days ago
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I got the 25 metre figure from a paper on the Storegga collapse - and I'll return and cite this when I'm back at where my notes are. It's the upper limit of the cited proposed model of what happened. It looks like Britannica is referencing the same model here (although I'm not claiming Britannica is a rock-solid source for the facts): "Some models of the Storegga slides estimate that tsunami waves exceeded 20–25 metres (65–80 feet) in height along the coast of the Shetland Islands, 10–12 metres (33–39 feet) along the Norwegian coast, and 5 metres (16 feet) along the coast of eastern Scotland." https://www.britannica.com/topic/Storegga-slides |
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> The resulting tsunami had run-up heights of around 10–20 m on the Norwegian coast, over 12 m in Shetland, 3–6 m on the Scottish mainland coast. ...
> We compare results from our multiscale model to previous results using constant-resolution models and show that accounting for changes in bathymetry since 8.15 ka, neglected in previous numerical studies of the Storegga slide-tsunami, improves the agreement between the model and inferred run-up heights in specific locations, especially in the Shetlands, where maximum run-up height increased from 8 m (modern bathymetry) to 13 m (palaeobathymetry).
The Time Team episode (mentioned elsewhere here) says the wave at Doggerland was up to 10 meters. https://youtu.be/XTvOcm5dgDI?t=1835 .
The most recent publication I found on the topic is https://www.frontiersin.org/articles/10.3389/feart.2021.7674... :
> The Storegga tsunami has previously been theorized as having brought about a swift and catastrophic end to Doggerland, the submerged palaeolandscape of the southern North Sea (Weninger et al., 2008). However, a more nuanced understanding is beginning to emerge in the wake of numerical modelling of the wave’s dispersal (Hill et al., 2014; Hill et al., 2017), and the discovery of the first confirmed evidence of the tsunami from a submarine context, “core ELF001A” from the “Southern River” submerged river valley, recovered by the Europe’s Lost Frontiers team (Gaffney et al., 2020). Clearly the Storegga tsunami hit some of the coastlines of the southern North Sea with considerable force, but the severity of this impact was probably variable (Walker et al., 2020).
It cites "run-up heights in excess of 25 m recorded in parts of Scotland and Norway".