Study of deep structure of various trench-ridge system, and that of present activity elucidated by micro earthquake observation

研究各种海沟-山脊系统的深层结构以及通过微地震观测阐明的当前活动

• 批准号: 13373001
• 负责人: SHIMAMURA Hideki
• 金额: $ 26.46万
• 依托单位: National Institute of Polar Research (2004)Hokkaido University (2001-2003)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13373001/
• 关键词: earthquake observations; plate boundary; micro earthquakes; Ocean Bottom Seismograph; Mid Ocean Ridge; subbottom structure; tectonics; earthquake foci distribution; パタゴニア; フェゴ島; スコシア・プレート; 南米プレート; 海底地震観測; 大西洋中央海嶺; プリューム; 北大西洋; プレート; エアガン

The aim of this research "Study of deep structure of various trench-ridge system, and that of present activity elucidated by micro earthquake observation" was to study present activity and subbottom structure of the sites where plates were made, as well as the sites of plate boundaries.In order to make this kind of studies, it is essential to deploy a number of seismographs in order to make natural earthquake observations and/or to make controlled source seismological studies. Every year from 2001 through 2004 we made successfully sensitive seismographic studies in various important sites.Many interesting sites of geoscience are beneath sea bottom because new plates were only born on the sea bottoms, so that sensitive and reliable OBS (Ocean Bottom Seismographs) are indispensable to make this kind of studies. The OBS, which has been successfully developed by Shimamura and his group since late 1960's, were commonly used in this study.In 2001, two expeditions were made, in the Marmara Sea, Turkey, and in the Carribean Sea near Guadelupe and Martinique Islands. In 2002 the expedition was made in the North Atlantic - Arctic Sea region near Svalbard Islands. This study was for controlled source seismology to illustrate subbottom deep structure. In 2003 the expedition was made in the Norwegian Sea, off the west coast of Norway. The aim of this research was to elucidate the history of the opening of the Atlantic Ocean, and present activity and situation of the Atlantic Ocean. In 2004, the expedition was made in the Southern Argentina, Fiego Islands, where the plate boundary of the Scotia plate crosses the Island. Micro earthquake study has illustrated the exact position of the present plate boundary and the activity of the plate boundary.

这项“研究各种海沟-山脊系统的深层结构以及通过微地震观测阐明的当前活动”的研究目的是研究板块制作地点以及板块边界地点的当前活动和地下结构。为了进行此类研究，必须部署许多地震仪以进行自然地震观测和/或进行受控源地震学研究。从2001年到2004年，我们每年都在各个重要地点成功地进行了灵敏的地震学研究。许多有趣的地球科学地点都在海底，因为新板块只能在海底诞生，因此灵敏可靠的OBS（海底地震仪）对于进行此类研究是必不可少的。岛村和他的团队自1960年代末以来成功开发的OBS在这项研究中得到了广泛应用。2001年，我们进行了两次考察，分别在土耳其的马尔马拉海以及瓜德卢普岛和马提尼克岛附近的加勒比海。 2002年，探险队在斯瓦尔巴群岛附近的北大西洋-北冰洋地区进行了探险。这项研究旨在通过受控源地震学来说明地下深层结构。 2003年，这次探险在挪威西海岸附近的挪威海进行。这项研究的目的是阐明大西洋开放的历史以及大西洋目前的活动和状况。 2004年，这次考察的地点是阿根廷南部的菲戈群岛，这里是斯科舍板块的板块边界与该岛交叉的地方。微地震研究揭示了现今板块边界的准确位置和板块边界的活动性。

项目成果

Spatial relationship between recent compressional structures and older high-velocity crustal structures; Examples from the Voring Margin, NE Atlantic, and Northern Honshu, Japan.

近代挤压结构与较早的高速地壳结构之间的空间关系；

• 发表时间: 2003
• 期刊: Journal of Geodynamic 36
• 作者: Mjelde;R.
• 通讯作者: R.

Lower crustal seismic velocity-anomalies ; magmatic underplating or sepentinized peridotite? Evidence from the Voring Margin, NE Atlantic.

下地壳地震速度异常；

• 发表时间: 2002
• 期刊: Marine Geophysical Researches 23
• 作者: Mjelde;R.;Kasahara;J.;Shimamura;H.;Kamimura;A.;Kanazawa;T.;Kodaira;S.;Raum;T.;Shiobara;H.
• 通讯作者: H.

A possible Caledonide arm through the Barents Sea imaged by OBS data.

OBS 数据拍摄到的可能是穿过巴伦支海的卡里多尼德臂。

• 发表时间: 2002
• 期刊: Tectonophysics 355
• 作者: Breivik;A.;Mjelde;R.;Grogan;P.;Shimamura;H.;Murai;Y.;Nishimura;Y.;Kuwano;A.
• 通讯作者: A.

Lepine, Shimamura, Murai, Mjelde, Hirn: "A comparison between the sub-bottom structure of Knipovich Ridge and mid Atlantic Ridge"(発表予定).

Lepine、Shimamura、Murai、Mjelde、Hirn：“克尼波维奇海脊和大西洋中脊的底层结构的比较”（待提交）。

Lepine, Murai, , Nishimura, Him, Shimmaura et.al.: "Seismic tomography of the Marmara Sea, Turkey, made by a joint observation of 32 OBS and 160 land seismographs"Tectonophysics. (発表予定).

Lepine、Murai、Nishimura、Him、Shimmaura 等人：“通过 32 个 OBS 和 160 个陆地地震仪的联合观测对土耳其马尔马拉海进行地震层析成像”（待提交）。