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- The Planet Labs image also captured the whole of the landslide, which is very large. This is the image:- A high resolution SkySat satellite image of the Gjerdrum landslide in Norway.
blogs.agu.org/landslideblog/2021/01/05/planet-labs-gjerdrum-landslide/Planet Labs high resolution satellite image of the Gjerdrum ...
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Jan 5, 2021 · My friends at Planet Labs have now managed to capture an excellent SkySat high resolution satellite image of the site – once again can I note my thanks to them, and in particular to Rob Simmon, for their support. This is the first image that I have seen of the entirety of the site.
- The causes of the 30 December 2020 Gjerdrum landslide in Norway
An official investigation highlighted that the cause of the...
- The causes of the 30 December 2020 Gjerdrum landslide in Norway
The 2020 Gjerdrum landslide was a quick clay landslide that occurred in the early hours of 30 December 2020 at Ask village, the administrative centre of Gjerdrum, Norway. It spanned a flow off area of 300 by 700 metres (980 by 2,300 ft) and additionally affected 9 hectares (22 acres) by debris flow.
Jun 9, 2023 · An official investigation highlighted that the cause of the 30 December 2020 Gjerdrum landslide in Norway was small failures along the stream.
- Seabed Became Clay
- Washes Out The Salt
- 100,000 People Live in Quick Clay Areas
- Long-Term Safety Work
- Lime and Cement
The ice was thickest 20,000 years ago, and it melted about 10,000 years ago. “The land was depressed from the weight of the ice. When the ice retreated and became thinner, the land began to rise,” Solheim said. The ice retreated inland from what was then the coast. The sea followed the ice front. When the heavy ice no longer depressed the land, the...
The clay that was deposited on the seabed contained a lot of salt water. The structure of this kind of clay is stable as long as it continues to contain salt. But as the millennia pass, rainwater and groundwater wash out the salt. That’s what transforms clay into quick clay. Anders Solheim compares what happens next to a house of cards. While a hou...
The largest quick clay area in Norway is found on both sides of the Oslo Fjord and north of Romerike, which is the area where Gjerdrum is located. There is also a lot of quick clay in Trøndelag, in central Norway. It is also found all the way from Agder County, in southernmost Norway, to Finnmark County, at Norway’s northernmost tip. As recently as...
The follow-up after the landslide in Gjerdrum on 30 December will continue for at least the next year to year-and-a-half. “What’s happening now is a lot of clearing work and a number of ground investigations. We are at the very beginning of this effort,” says Håkon Heyerdahl, who is division manager for snow and rockslides at NGI, the Norwegian Geo...
Some slopes will be levelled, while there will be backfill against other slopes. “We’ll probably stabilize parts of the area with lime and cement. When these components are mixed with wet clay, it solidifies,” says Traae. He compares the finished solid mass to unreinforced concrete. “That will provide some stronger areas that will increase the load...
Dec 31, 2020 · The latest update on the Gjerdrum landslide is in a new post. A total of eight additional homes have now collapsed into the landslide, illustrating the continued instability of the area. Some of the buildings were multiple occupation units; in total it is reported that 31 homes have been lost. About 1,000 people have now been evacuated.
On 30 December 2020 a quick-clay landslide occurred in Gjerdrum, Norway. Becauseof the severe consequences, the Norwegian government appointed an externalexpert committee to investigate the landslide.
Dec 30, 2020 · Aerial footage shows the scale of a landslide in a Norwegian village which has left at least nine people injured. Houses have been buried by mud and several hundred residents have been...
