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Tectonics of the Western Pacific Area using GPS

使用 GPS 观测西太平洋地区的构造

基本信息

批准号：
07041091
负责人：
KATO Teruyuki
金额：
$ 5.25万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07041091/
关键词：
GPS Crustal movement plate tectonics dynamics space technique western Pacific Philippine Sea plate

项目摘要

In order to investigate tectonics in the western Pacific area, a regional GPS continuous tracking network has been constructed. During the research period, following sites were established ; Marcus in Japan, Truk in Micronesia, Manila in Philippine, Taejeon in Korea, Vladivostok in Russia and Port Moresby in Papua New Guinea. Together with otherwise established sites in Ishigaki in Japan and Koror in Palau, we now have eight sites to be used for the above research purpose. Data are accumulated in the PC and MO system emplaced at most of sites. They are sent by regular mail basis for each two to three months to the Earthquake Research Institute, University of Tokyo.We have used thus obtained data since July 1995, to delineate displacement velocity vectors in the region. For this purpose, adding to above sites, we incorporated other sites of IGS (International GPS Service for Geodynamics) for better regional coverage and densification. At the analysis we used Bernese software Ver4.0 together with IGS precise orbits.Results obtained by the fiducial free strategy indicates the followings ;1 Manila site is moving toward northwest suggesting effects of the convergence of the Philippine Sea plate,2 Ishigaki site is moving nearly south suggesting the opening of the Okinawa trough, which is one of active back-arcs,3 Displacement rate of Guam is too small comparing with expected rigid motion of the Philippine Sea plate, suggesting the effects of Mariana backarc opening,4 All sites in the far eastern Asian continent, such as Taejeon, Shanghai etc., shows eastward to north-eastward displacement, suggesting effects of the collision of Indian continent toward the Eurasian continent.

为了研究西太平洋地区的构造，建立了一个区域GPS连续跟踪网。在研究期间，建立了以下站点；日本的马库斯、密克罗尼西亚的特鲁克、菲律宾的马尼拉、韩国的大田、俄罗斯的符拉迪沃斯托克、巴布亚新几内亚的莫尔兹比港。加上在日本石垣和帕劳科罗尔建立的其他地点，我们现在有八个地点用于上述研究目的。数据是在大多数站点的PC和MO系统中积累的。它们每两到三个月通过普通邮件发送到东京大学地震研究所。自1995年7月以来，我们一直使用这些数据来描绘该地区的位移速度矢量。为此，除了上述站点外，我们还合并了IGS （International GPS Service For Geodynamics）的其他站点，以获得更好的区域覆盖和密度。在分析中，我们使用伯尔尼软件Ver4.0和IGS精确轨道。基准自由策略的结果表明：1马尼拉站点向西北移动，提示菲律宾海板块辐合的影响；2石垣站点近南移动，提示冲绳海槽的打开，是一个活跃的弧后；3关岛的位移率与菲律宾海板块的预期刚性运动相比太小，提示马里亚纳弧后打开的影响；4远东大陆的所有站点，如太原、上海等。显示东向东北移动，表明印度大陆与欧亚大陆碰撞的影响。