Tsunamis - Extreme Events: A Physical Reconstruction and Risk Assessment - page 122

5 ° E

Storegga
slide

Iceland

6-7 m

North Sea

10-12 m
9-10 m
3-5 m

60 ° N

>10 m

Shetland
Islands

> 20 m

3 -6 m

United
Kingdom

Ireland

200 km

Figure 5.7. Location of Storegga landslide and run-up heights of resultant tsunami
in Norway, Scotland and the Shetland Islands (after Bondevik et al. , 2003 ).

Figure 5.8. Storegga landslide-generated tsunami deposit in Sullom Voe, Shetland
(photograph courtesy of Dr S. Bondevik, University of Tromsø, Norway). The tsunami
deposit is composed of rip-up clasts of peat and pieces of wood interbedded with
sand. Bondevik et al. ( 2003 ) interpret this as a result of two waves with the first wave
eroding the peat surface and transporting the rip-up clasts of peat and the
backwash leaving the eroded clasts and other organic remains at the surface of the
tsunami-laid sand. The second wave buried the clasts in sand.