Cooperative research among Japan, Russia and Korea in crustal structure in transient areas between land and ocean around Japan Sea

日俄韩三国合作研究日本海周边陆海过渡区地壳结构

基本信息

批准号：
13440129
负责人：
ISEZAKI Nobuhiro
金额：
$ 8.9万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440129/
关键词：
Japan Sea Japan Basin Tushima Basin magnetic anomaly lineations oceanic crust continental crust EEZ (exclusive economic zone)

项目摘要

Japan Sea, which is a back-arc basin in the northwestern Pacific, is located between Asian continent and Japanese islands. It comprises the Japan Basin in the north and northwest, the Yamato Basin in the southeast, and the Tsushima Basin in the southwest. Three deep basins comprise the Japan Sea ; they are separated by rifted continental remnants such as the Korea Plateau, Oki Bank, and Yamato Bank. The opening of the Japan Sea was initiated by crustal thinning in the northeastern Japan Basin in Early Oligocene, followed by seafloor spreading in the Late Oligocene. During initial spreading of the Japan Basin, and later one of the southern Japan Sea there underwent crustal extension, forming the Yamato and Ulleung Basins. In the Late Miocene, changes in plate motions and subduction mode along the subduction zones, east and southwest of Japanese Islands, caused bark-arc closing and crustal shortening that has continued till the present. We have conducted the OBS (Ocean Bottom Seismometer) experiments, magnetic and gravity surveys, and single air-gun survey to make clear the crustal structure in the transient area between land and ocean. As the result, we got the mixed structure with oceanic and continental ones, and understood importance of magnetic anomaly information obtained at near bottom using DTCM which will lead us smoothly to confirm the result.

日本海是西北太平洋的一个后弧盆地，位于亚洲大陆和日本群岛之间。它包括北部和西北部的日本盆地，东南部的亚马托盆地，以及西南部的Tsushima盆地。三个深层盆地包括日本海；它们被裂谷的大陆残留物（例如韩国高原，Oki Bank和Yamato Bank）隔开。日本海的开放是由渐新世早期日本盆地东北部盆地的地壳稀疏发起的，随后在渐新世晚期蔓延。在日本盆地的最初蔓延期间，后来在那里的南部海洋中进行了地壳延伸，形成了亚马托和乌勒河盆地。在中新世晚期，日本群岛东部和西南部的俯冲带的板块运动和俯冲模式的变化导致树皮 - 交易和地壳缩短一直持续到现在。我们已经进行了OBS（海洋底部地震计）实验，磁性和重力调查以及单枪调查，以清除土地和海洋之间瞬态区域的地壳结构。结果，我们获得了带有海洋和大陆的混合结构，并了解使用DTCM在底部获得的磁异常信息的重要性，这将使我们顺利地确认结果。