@article{oai:ir.kagoshima-u.ac.jp:00011305, author = {大木, 公彦 and OKI, Kimihiko and 湯浅, 秀隆 and YUASA, Hidetaka}, journal = {鹿児島大学理学部紀要, Reports of the Faculty of Science, Kagoshima University}, month = {Dec}, note = {In the upper and middle reaches of Amori River, the Kakuto Pyroclastic Flow Deposit, the Aira Beds 1&2, the Ata Pyroclastic Flow Deposit and the Tsumaya-Ito Pyroclastic Flow Deposits are distributed in ascending order. The altitude of top surface of the Kakuto Pyroclastic Flow Deposit becomes higher toward the west in this area. Altitude is about 60 meters above sea level around Kokubu alluvial plain and is about 220 meters in the eastern margin of Jusan-tsukabaru plateau though thickness of the pyroclastic flow deposit is almost same. This feature described above suggests that a peculiar mode of occurrence of the Kakuto Pyroclastic Flow Deposit coincides with the topography of the erosion surface of the basement rocks. On the other hand, the Ito Pyroclastic Flow Deposit fills up in the basin-like erosion surface of the underlying beds and the top surface of the pyroclastic flow deposit is rather flat. In the western and eastern parts of studied area the top surface of pyroclastic f?low deposit is preserved and Jusan-tsukabaru and Haruyama-bai plateaus are formed. In contrast to this, the pyroclastic flow deposit was eroded by river and deep valleys were cut in the center part of studied area. These valleys generally run in NE-SW and NW-SE directions. From this it may be inferred that they are eroded along tectonic faults.}, pages = {19--29}, title = {天降川中流・上流域の地形・地質に関する一考察}, volume = {45}, year = {2012} }