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  2018年北海道胆振東部地震による似湾川・沙流川の右岸地区における岩盤地すべりの現地調査 Login DSpace Home → 学術論文等 → 020 文理学部 → 020 文理学部自然科学研究所研究紀要 → 第58号（2023年） → View Item Javascript is disabled for your browser. Some features of this site may not work without it. 2018年北海道胆振東部地震による似湾川・沙流川の右岸地区における岩盤地すべりの現地調査 佐藤, 浩; 中埜, 貴元; 金子, 誠; 石丸, 聡; 宇佐見, 星弥 URI: https://repository.nihon-u.ac.jp/xmlui/handle/11263/2313 Date: 2023-02-28 Abstract: We conducted field surveys at two landslide locations in the study area, based on previously published inventories of deep-seated landslides triggered by the 2018 Hokkaido Eastern Iburi Earthquake. On the right bank area of the Niwan River and on the right bank area of the Saru River, we observed outcrops formed by major- and sub-scarps, and landslide bodies. In the Niwan Area, we initially assumed that the alternating mudstone-sandstone would have slid as an opposite slope landslide because this east-facing slope is situated on the west wing of the NNW-SSE anticline axis, as shown on the 1:50,000 geological map. However, we found that the landslide occurred through dip-slope motion. Therefore, the anticline axis is possibly located further west of the mapped location. Earlier studies indicated that earthquakes prior to 2018 also induced landslides in the study area. Therefore, we also examined the Saru Area, 50 m NE of the Biratori fault, where a deep-seated landslide was triggered by the 2018 Earthquake. Here, we found that the mudstone basement did not slide along the bedding plane but along a joint surface with a strike parallel to that of the Biratori fault. This suggests that shakes and surface deformations by the 2018 Earthquake and earthquakes prior to 2018 have involved with the joint sur-face development. Show full item record Files in this item Name: 058_P045.pdf Size: 8.587Mb Format: PDF View/Open This item appears in the following Collection(s) 第58号（2023年） [14] Search DSpace Search DSpace This Collection Advanced Search Browse All of DSpace Communities & Collections By Issue Date Authors Titles This Collection By Issue Date Authors Titles My Account Login DSpace software copyright © 2002-2016  DuraSpace Contact Us   Copyright © 2013 Nihon University. All rights reserved.