九州における火山活動と陥没構造に関する諸問題
スポンサーリンク
概要
- 論文の詳細を見る
Results of the recent study of the post-Miocene volcanic geology, distribution of pre-Miocene system, bouger anomalies, active faults and recent crustal deformation in Kyushu arrived at the following conclusions. 1) In the central Kyushu, there is conjecture to exist a graben structure with a general trend of ENE-WSW from the Beppu City to the Shimabara Peninsula in the post Miocene age. This graben is named the Beppu-Shimabara graben by author in this paper. The scale of this graben is about 150 km in length and 20-30 km in width. 2) The Beppu-Shimabara graben is divided by the discontinuous points into three parts, as the Kujyu-Beppu, Aso-Kujyu and Shimabara-Kumamoto grabens. 3) In the Sobosan-Okueyama district are found the Setouchi volcanic activities as well as the lower-most green tuff activities in the early Miocene, with three calderas or caldera like depression structure. These are the Okueyama caldera of va11es type, Sobosan semi-caldera and Katamukiyama caldera. 4) In the early Miocene green tuff regions in Kyushu are estimated that exist of some volcanic depression structure in a few areas, which are the Usa, Taio, Hokusatsu and Nansatsu districts. 5) The green tuff and Setouchi volcanic activities in the middle Miocene are attended with some volcanic depression structures, which are the Toyo caldera and the Shishiki, Wakamatsu-jima and Osuzuyama districts. 6) The depression structures in dissolubly connected with the Bungo volcanic activities in the middle Pleistocene are the Kusu and Asono calderas. 7) The depression structures closely related with the Sanin volcanic series in the middle〜late Pleistocene, these are the Kujyu caldera, the Unzen graben and the Chijiwa caldera. 8) The Ryukyu volcanic zone, there are many gigantic calderas, as the Aso, Aira, Ata and Kikai calderas, and the Kirishima semi-caldera. In the Ata caldera has been acquainted with small calderas of the Ikedako and Yamakawa-wan.
- 日本地質学会の論文
- 1979-03-30
著者
関連論文
- 別府-島原地溝の発想とその後の発展および課題
- 壱岐島の地質 : とくに中新統壱岐層群について
- 北・中部九州における後期新生代火山活動の特性 : とくに地溝性陥没構造との関係
- 琉球列島における新生代火山活動
- 九州における火山活動と陥没構造に関する諸問題
- 日本におけるスカルン帯からのフェロヘスティングスセン石
- 北中部九州におけるグリーンタフ活動