dc.contributor.author | Holmsen, Gunnar | |
dc.coverage.spatial | 16122 Tvedestrand | |
dc.date.accessioned | 2020-08-26T12:39:41Z | |
dc.date.available | 2020-08-26T12:39:41Z | |
dc.date.issued | 1946 | |
dc.identifier.uri | https://hdl.handle.net/11250/2674566 | |
dc.description.abstract | This happened 11 km North of the town Tvedestrand. On the beach of the lake a main road was hit by a landslip on the 14th of Aug. 1935. Tje ground along with the road sunk over a distance of 60 m. Above the level of Songevatn an area of 5 000 sq. m was wasted, the submarine landslip probably being far greater. The slip caused the rising of a high wave in the lake. A boy of 15 perished. The water depth at the beach increasing from a few to 10-15 meters. The profile of the ground in 3 m high brink of the slip showed a top layer of sand, then peat over dark sandbeds with plant remaines. These layers had been deposited above the lake level and rested on marine caly deposits. An investigation proved that to a great extent the clay was a \"kvikk\"-clay, i.e. a silty clay, which by stirring movements in the ground will go liquid. As to the cause of this landslip no theory is formed. The water-level in Songevatn was supposed to be unusually low before the landslip occurred. | |
dc.language.iso | nor | |
dc.relation.ispartofseries | NGU (166) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | AVSETNING | |
dc.subject | LEIR | |
dc.subject | SKREDAVSETNING | |
dc.subject | SKREDFORM | |
dc.subject | GEOLOGISK UNDERSØKELSE | |
dc.subject | KVIKKLEIRE | |
dc.title | Lerfall ved Songevatn. | |
dc.type | Journal article | |
dc.description.localcode | 34836 | |
dc.source.pagenumber | 16-19 | |