@article{oai:niigata-u.repo.nii.ac.jp:00028227,
 author = {高浜, 信行},
 journal = {新潟大学積雪地域災害研究センター研究年報, 新潟大学積雪地域災害研究センター研究年報},
 month = {Mar},
 note = {Noh district in the northern part of the Fossa Magna is famous for abundant distribution of landslides in Japan. The purpose of this study is to investigate the development of the Kibu landslides accompanied with the change of the general base level during Late Quaternary at the Noh coastal region. The change of the general base level is recorded as four step of terraces at the mouth of Noh river. Simplified profile showing the development history of the terraces are indicated in Fig.2 and at Table 1. The figure lead to the following interpretation of change of the general base level. The 1st stage : formation of the Palaeo Noh Valley II at the 「Riss Glacial」 age, perhaps the general base level at this time would be lower than the present sea level. The 2nd stage : deposition and filling up the Palaeo Noh Valley II as the general base level ascend during the post「Riss Glacial」. The 3rd stage: formation of the Terrace surface I at EI. 70m* (「Riss/Wurm」 Interglacial age), during the stable period of the general base level. The 4th stage: formation of the Terrace surface II at EI. 40～45m* (the early stage of the Wurm Glacial), at the relatively stable period, during descending stage of the general base level at the Wurm Glacial age. The 5th stage: formation of the Palaeo Noh Valley I (maximum Wurm). The general base level of this stage was EI. -100～-140m around the Japanese Islands. The 6th stage: deposition and filling up the Palaeo Noh Valley I and formation of the present Noh Valley as the general base level ascend at the Post Glacial age. (*These elavations do not indicate the absolute general base level). Landslides takes place as a process of erosion., It is controlled by the degree of development of the mountain slopes. The mountain slopes would be affected by the tectonic movement and also by the change of the general base level. The author discussed the development of the Kibu landslides firstly, from the viewpoint of the change of the general base level. Of course, this area have been deformed by the tectonic movement from the 「Riss Glacial」 age to the present, but this is the next problem to be solved. The development of the Kibu landslides is interpreted as follows: 1. The primary Kibu landslides would be occurred at the Palaeo Noh Valley II stage. This interpretation is based on the following aspects; 1) Gravel bed of the Terrace II covers the old colluvial deposits of the primary Kibu landslides. 2) The general base level from the Terrace I stage to the Terrace II stage was higher than the Terrace II stage. Therefor the primary Kibu landslides occurred before the Terrace I stage. 3) Further, very steep slopes would exist in the Palaeo Noh Valley II, and big landslides might have occurred easily in this area. 2. The primary Kibu landslide mass would be relatively stable from the birth of the landslides to the Terrace II stage, because of ascending of the general base level. 3. At the next stage, the primary Kibu landslides mass would be instable owing to descending of the general base level at the Wurm Glacial age, and the secondary Kibu landslides occurred. But, short relatively stable period would exist at the Terrace II stage that is correlative to the early stage of the Wurm Glacial age. 4. The most active stage of the secondary Kibu landslides would be at the Palaeo Noh Valley I stage (maximum Wurm). 5. At the Post Glacial age, this area will be relatively stable owing to ascending of the general base level.},
 pages = {51--61},
 title = {北部フォツサ・マグナ能生海岸の段丘形成史と鬼舞地すべりの発達史},
 volume = {2},
 year = {1980}
}