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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第72号 >
北海道北部, サロベツ原野における浅部地下構造
| Title: | 北海道北部, サロベツ原野における浅部地下構造 |
| Other Titles: | Estimation of shallow subsurface structure in the Sarobetsu marshland, Northern Hokkaido |
| Authors: | 田村, 慎1 Browse this author | | 大津, 直2 Browse this author | | 岡, 孝雄3 Browse this author | | 秋田, 藤夫4 Browse this author | | 若浜, 洋5 Browse this author | | 酒井, 利彰6 Browse this author | | 石島, 洋二7 Browse this author |
| Authors(alt): | Tamura, Makoto1 | | Ohtsu, Sunao2 | | Oka, Takao3 | | Akita, Fujio4 | | Wakahama, Hiroshi5 | | Sakai, Toshiaki6 | | Ishijima, Yoji7 |
| Issue Date: | 15-Mar-2009 |
| Publisher: | 北海道大学大学院理学研究院自然史科学部門（地球物理学） |
| Journal Title: | 北海道大学地球物理学研究報告 |
| Journal Title(alt): | Geophysical bulletin of Hokkaido University |
| Volume: | 72 |
| Start Page: | 51 |
| End Page: | 77 |
| Abstract: | The Sarobetsu marshland, it is one of the vast marsh in Hokkaido, is constructed by the Teshio River and the Saribetsu River. Because of the maximum scale high moor of Japan, various vegetation and waterfowls breeding at the Penke and the Panke swamps, Sarobetsu marshland is registered in Ramsar Convention in 2005. But recently, drawing up the underground water by farmers, drain work at surrounding area to make farmland and invasion of Sasa (a kind of bamboo) make the marshland dry. Therefore, it is an urgent problem for the preservation of marshland environments. Geological Survey of Hokkaido (GSH) and Horonobe Research Institute for the Subsurface Environment (Horonobe-RISE) had started electrical and geological surveys to clarify the underground water structure in this area to maintain a balance of marshland and farmland. In the results, resistivity layer in this area is divided into five layers and the third layer is further subdivided into two layers. And also we can make four lines of two-dimensional resistivity model. Comparing with the resistivity model and geological data, we conclude that the layers I, II and III, are correspond to the alluvium, the layer IV corresponds to the basement, and the layer V corresponds to the Koetoi layer. From the depth contour map of the base of the layer III (or the top of the layer IV), the alluvium layer get sharply thinner as closer to the eastern hills. This area is meandering zone of Sarobetsu River and mostly corresponds to the Sarobetsu fault zone. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/38145 |
| Appears in Collections: | 北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第72号
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