Doggerland was submerged by a tsunami formed in what ocean?
Storegga Slide The three Storegga Slides are considered to be amongst the largest known landslides. They occurred under water, at the edge of Norway's continental shelf in the Norwegian Sea, approximately 6225–6170 BCE. The collapse involved an estimated 290 km length of coastal shelf, with a total volume of 3500 km3 of debris, which caused a very large tsunami in the North Atlantic Ocean.
1947 Gisborne earthquakes and tsunami The 1947 Gisborne earthquakes and tsunami occurred east of Gisborne, offshore New Zealand's North Island. Both earthquakes are estimated to have measured at most 7.1 on the moment magnitude scale. The first earthquake, which struck offshore Poverty Bay on 26 March is estimated to have been between 7–7.1 , and generated a tsunami with a maximum measured run up height of 10 metres. The tsunami caused widespread damage along the north-east coast of the North Island, but was not observed outside of New Zealand. Seven weeks later, a second earthquake struck offshore Tolaga Bay on 17 May, and was estimated to have been between 6.9–7.1 M . It also generated a tsunami, with a maximum measured run up height of 6 metres. Despite occurring at low tide and being less powerful the second time around, the tsunami caused small amounts of damage along the east coast and is noted for washing away construction materials ironically being used to repair damage from the previous tsunami.