第4紀地図の作成過程からみた大陸棚 (日本第4紀研究の諸問題--第4紀地図の作成過程から<シンポジウム>)

概要

論文の詳細を見る
The morphology of the continental shelf around the Japanese Islands was examined. The depth of the shelf edge measured at 455 points is 140m on an average and almost always shallower than 200m. The marginal terrace, 250 to 500m in depth, stretches along the continental shelf off the southwest Japan coast facing the Japan Sea and off the Sanriku coast in northeast Japan. The continental shelf is generally divided into three segments: inner shelf (terrace shallower than about 60m), middle shelf (gentle slope between 60 and 100m), and outer shelf (terrace deeper than about 100m). The features of saddles and caldrons in the Tugaru and Tusima Straits indicate an abrupt change in the currents through these straits after the latest glacial age. Such a change is consistent with the paleo-climatic change in the Japan Sea estimated with the results of core analysis.
日本第四紀学会の論文