関東堆積盆地の形成機構に関する一試論

概要

論文の詳細を見る
The Kanto sedimentary basin has been developed since late Miocene where marine formations were accumulated more than 10,000 m in total thickness. The basin was formed accompanied by collapse subsidence, and its center shifted toward north. At late Pleistocene it begins to uplift. The general feature of topography of the basin reflects such recent upheaval movement that shows the block-like deformation. Such blocks are related with the hypocenters several tens km in depth. The authors propose a model to explain not only those geologic developments but the distribution of hypocenters of earthquakes. They suppose that the fundamental process of those movements is the upheaval of land and subsidence of the Pacific Ocean due to the movement of the deeper part of the earth. Then they tried the computer simulation experiment in order to reconstruct the formation and development of the basin applied the vertical movement 100 km in depth. The experiment showed that tension area appeared near the shoulder of deformation and were shifted toward upheaval area. As the collapse basin might be formed around the tension area, the development of the basin in the experiment is comparable with that of the Kanto basin.
日本地質学会の論文
1981-03-30