Tectonics of the eastern Asia and the western Pacific as seen by GPS observations
Tectonics of the eastern Asia and the western Pacific as seen by GPS observations
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DOI：
10.1007/bf02910259
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发表时间：
2003-03-01
影响因子：
1.2
通讯作者：
Kato, T
中科院分区：
文献类型：
--
作者：
Kato, T
利用全球定位系统测量了东亚和西太平洋的瞬时构造运动。为此目的，在该地区建立了一个连续跟踪网络，称为西太平洋全球定位系统综合网络。获得的现场速度分布清楚地表明，太平洋和菲律宾海板块等海洋板块的移动主要是刚性的，而大陆板块变形相当大。然后，利用冲之鸟岛和其他岛屿的GPS速度估计了菲律宾海板块的欧拉矢量。为了得到更详细的东亚地区的速度场，将许多已发表的速度场合并，使它们在最小二乘意义下在共同占据的站点上是一致的。结果清楚地显示了印度次大陆向欧亚大陆的构造碰撞。此外，在藏北地区，侵入岩石圈明显向东挤压，表现出明显的速度弯曲。碰撞的影响向远东地区扩散到朝鲜和日本。日本地理调查研究所最近建立了一个全国性的密集GPS阵列，由大约1000个永久站点组成。从这个网络得到的速度场清楚地描绘了周围板块的影响。
Instantaneous tectonic motions in the eastern Asia and in the western Pacific have been measured by the Global Positioning System. For this purpose, a continuous tracking network in the area named as the Western Pacific Integrated Network of GPS (WING) has been established. Obtained distribution of site velocities clearly suggests that oceanic plates such as Pacific and Philippine Sea plates are moving mostly as rigid, while the continental plate deforms considerably. Then, the Euler vector of the Philippine Sea plate was estimated using GPS velocities at Okino Torishima and other islands. In order to derive more detailed velocity field in east Asia, many of published velocity fields were combined so that they are consistent at the commonly occupied sites in the least squares sense. Results clearly show tectonic collision of Indian subcontinent toward Eurasia. Moreover, it is evident that the intruded lithosphere is extruding toward east showing acute bend of velocities in the north of Tibet. The effect of collision looks propagates towards far-east to Korea and Japan. Geographical Survey Institute of Japan recently established a nationwide dense GPS array consisting of about 1000 permanent sites. The velocity field obtained from this network clearly portrays effects of the surrounding plates.