地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
琉球弧のトカラギャップおよびケラマギャップにおける精密地形形態
松本 剛木村 政昭仲村 明子青木 美澄
著者情報
ジャーナル フリー

1996 年 105 巻 3 号 p. 286-296

詳細
抄録

Precise topographic features at the two major structural boundaries in the Ryukyu Arc, Tokara Gap and Kerama Gap, revealed that there exists a ridge feature of the Ryukyu Arc as a saddle topography. The feature supports the idea recently proposed that a landbridge connecting the Chinese continent, Ryukyu Islands and Japanese Islands, is thought to have been subsided since Late Pleistocene. The saddle is offset by large-scale left-lateral normal faults both of which are related to the opening of the Okinawa Trough. These topographic features and geological structure together with the gravity anomaly and regional tectonics in the Ryukyu area suggest that a north-south tensional stress regime, due to the rolling buck of the Philippine Sea Plate at the Ryukyu Trench, has dominated in this region since last 20, 000 years.

著者関連情報
© Copyright (c) 東京地学協会
前の記事 次の記事
feedback
Top