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为了研究西太平洋地区的构造形变特征,在此建立了一个连续的GPS跟踪网络,并命名为西太平洋整体GPS网络(WING)。1995年至1997年3月该网共建有10个新站点。我们利用该网1995年7月到1996年10月的观测资料和国际GPS地球动力学服务(IGS)全球站的数据来估算各站点的日坐标,并采用自由基准方法以获取最优基线解。为了将估算的坐标归算到地球参考框架上,我们根据Heki(1996)的估算结果,假设筑波IGS站点正相对稳定的欧亚板块以约2cm/a的速度向西运动。我们发现:(1)海洋板块内各站点的运动速度与刚性板块运动模型吻合得很好;(2)板块边界附近站点的运动受到板块边界形变的影响。在这些板块边界中,马里亚纳和冲绳海沟的弧后隆起(扩张)清晰可辨;(3)位于东亚地区的各站点正相对稳定的欧亚板块向东到东南方向运动,反映了印度板块和亚洲板块北向碰撞的长距离效应。
In order to study the tectonic deformation in the western Pacific, a continuous GPS tracking network was established and named as the Western Pacific Global GPS Network (WING). From 1995 to March 1997, the network built 10 new sites. We use the observed data of the network from July 1995 to October 1996 and the data of the Global GPS Global Service (IGS) Global Station to estimate the daily coordinates of each site and to use the free baseline method to obtain the optimal baseline solution. To reduce the estimated coordinates to the earth reference frame, we assume from the estimation by Heki (1996) that the relatively stable Eurasian plate at the Tsukuba IGS site moves westward at a rate of about 2 cm / a. We find that: (1) The velocity of each site in the ocean plate is in good agreement with that of the rigid plate; (2) The motion of the site near the boundary of the plate is affected by the plate boundary deformation. (3) The eastward-southeastward movement of the relatively stable Eurasian plate at each site located in East Asia reflects the Indian plate And long-range effects of the northward collision of Asian plates.