Study of on Quaternary landform development in inland basins and coastal plain in the Northeast Japan Arc using tephrochronology and magnetostratigraphy

2017 Fiscal Year Final Research Report

• Project/Area Number: 25282082
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Geography
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: SUZUKI Takehiko 首都大学東京, 都市環境科学研究科, 教授 (60240941)
• Co-Investigator(Kenkyū-buntansha): 植木 岳雪 千葉科学大学, 危機管理学部, 教授 (40371025) ; 石村 大輔 首都大学東京, 都市環境科学研究科, 助教 (00736225)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 東北日本孤 / 盆地 / 地下地質 / 火山灰編年学 / 地形発達 / 前・中期更新世

Outline of Final Research Achievements

History of landform development in the Northeast Japan Arc have been not well constructed by scarcity of chronological data for underground geology in tectonically subsiding areas such as inland basins and coastal plain. This study clarified the relationships between underground geology of inland basins (Koriyama, Aizu, Yonezawa and Yamagata) and subsurface sediments surrounding these basins using tephrochronology. Firstly, stratigraphical data and characteristic properties of Early to Middle Pleistocene tephras originated from the Northeast Japan Arc, including the Shirakawa Ignimbrites and tephras derived from Numasawa and Sunagoahra Calderas, have been prepared. Subsequently, we detected these tephras in underground basin sediments together with other widespread tephras, then constructed the histories for the formation of basin-fill sediments and landform.

Free Research Field

自然地理学