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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 1979 Abbotsford landslip ： ウィキペディア英語版 1979 Abbotsford landslip On 8 August 1979, a major landslip occurred in the Dunedin, New Zealand suburb of Abbotsford. It was the largest landslide in a built-up area in New Zealand's history, resulting in the destruction of 69 houses - around one sixth of the suburb - but no fatalities.〔("New Zealand disasters" ), Christchurch City Libraries website. Retrieved 1 October 2009.〕 ==Geography== The suburb of Abbotsford sits on the slopes of a hill in the southwest of Dunedin, separated from the main urban area by open semi-rural land. The larger suburb of Green Island sits on gentler slopes immediately to the south. Between the two lies the valley of the Kaikorai Stream and its tributary, Miller Stream. At the time of the slippage, Abbotsford was within Green Island Borough. Much of the northeastern end of Abbotsford's residential area was built on unstable ground. Schist bedrock is covered with a thick layer of mudstone, with a top coating of sand and clay-rich Cenozoic alluvial soil. This type of surface becomes slick during even moderate rainfall.〔("Abbotsford Landslide" ). Retrieved 1 October 2009.〕 Landslides of this type of material have been relatively widespread within the Greater Dunedin area throughout both recent prehistory and historical times.〔Bishop, D.G., and Turnbull, I.M. (compilers) (1996). ''Geology of the Dunedin Area''. Lower Hutt, NZ: Institute of Geological & Nuclear Sciences. ISBN 0-478-09521-X. p. 33.〕 The land was also sloping, and quarrying and the construction of the nearby Dunedin Southern Motorway during the 1960s and early 1970s may have further affected the land's stability. The event was non-seismic, the increased rainfall over the previous decade was the trigger and the slope gave way due to the clay seams that formed parallel to bedding. The clay seams formed due to flexural slip. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1979 Abbotsford landslip」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.