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

• 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)

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.

日本海位于亚洲大陆和日本列岛之间，是西北太平洋的弧后盆地。它包括北部和西北部的日本盆地，东南部的大和盆地和西南部的对马盆地。三个深盆地组成了日本海；它们被朝鲜高原、冲木滩和大和滩等断裂的大陆残余物隔开。早渐新世日本盆地东北部的地壳减薄引发了日本海的开闭，随后在晚渐新世海底扩张。在日本盆地的初期扩张过程中，随后在日本海南部进行了地壳伸展，形成大和盆地和郁陵盆地。晚中新世，在日本列岛东部和西南部的俯冲带，板块运动和俯冲方式的变化导致了树皮弧闭合和地壳缩短，这种变化一直持续到现在。通过海底地震仪（OBS）实验、地磁和重力测量、单气枪测量等，明确了海陆过渡区的地壳结构。得到了洋陆混合构造，认识到利用DTCM获取近底磁异常信息的重要性，将有助于我们对结果的顺利确认。

项目成果

T.Sato, H.Shinohara, B.Y.Karp, R.G.Kulinich, N.Isezaki: "P-wave velocity structure in the northern part of the central Japan Basin, Japan Sea with ocean bottom seismometers and airguns"Earth, Planet and Space. (accepted in March 23, 2004).

T.Sato、H.Shinohara、B.Y.Karp、R.G.Kulinich、N.Isezaki：“日本中部盆地北部、日本海的 P 波速度结构，带有海底地震仪和气枪”地球、行星和空间。

Park, S.H., Isezaki N., Seama N., Shon H., Kim J.W.: "Study on deep crustal structure of the Ulleung Basin, the Japan Sea, from separating shallow Components of gravity anomalies"Journal of the Geological Society of Korea. 38/4. 519-535 (2003)

Park, S.H., Isezaki N., Seama N., Shon H., Kim J.W.：“通过分离重力异常的浅层成分来研究日本海郁陵盆地的深层地壳结构”韩国地质学会杂志。

Park, S.H., Isezaki N., Seama N., Shon H., Kim J.W.: "Study on deep crustal structure of the Ulleung Basin, tne Japan sea, from separating shallow components of gravity anomalies"Journal of the Geological Society of Korea. 38/4. 519-535 (2002)

Park, S.H., Isezaki N., Seama N., Shon H., Kim J.W.：“通过分离重力异常的浅层成分来研究日本海郁陵盆地的深层地壳结构”韩国地质学会杂志。

Karp B.Ya., Medvedev S., Prokudin V., Lee J.M.: "High-velocity lower crustal layer in the Tsushima Basin, Japan Sea : results of ocean bottom seismographic observation"Proceedings and Abstracts for fifth IOC/WESTPAC, International Scientific Symposium, Se

Karp B.Ya.、Medvedev S.、Prokudin V.、Lee J.M.：“日本海对马盆地的高速下地壳层：海底地​​震观测结果”第五届 IOC/WESTPAC 论文集和摘要，国际科学

Karp B.Ya., Medvedev S, Prokudin V., Lee J.M: "High-velocity lower crustal layer in the Tsushima Basin, Japan Sea : results of ocean bottom seismo-graphic observation"Proceedings and Abstracts for fifth IOC/WESTPAC, International Scientific Symposium, Seo

Karp B.Ya.、Medvedev S、Prokudin V.、Lee J.M：“日本海对马盆地的高速下地壳层：海底地​​震观测结果”第五次 IOC/WESTPAC 国际会议记录和摘要