Micro-plate tectonics and kinematics in Northeast Asia inferred from a dense set of GPS observations
Micro-plate tectonics and kinematics in Northeast Asia inferred from a dense set of GPS observations
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DOI：
10.1016/j.epsl.2007.03.011
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发表时间：
2007-05
影响因子：
5.3
通讯作者：
Shuanggen Jin;P. Park;Wen-yao Zhu
中科院分区：
文献类型：
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作者：
Shuanggen Jin;P. Park;Wen-yao Zhu
东北亚板块构造非常复杂，在由许多微板块，特别是有争议的阿穆尔板块嵌入的广阔的板块变形带中，地震活动分散而稀疏。目前，该地区日益密集的GPS网为研究板块运动学和确定近似的板块构造几何形态提供了重要的工具。在本文中，我们已经处理了GPS数据（1998-2005年）收集了广泛的GPS网络（中国和韩国）超过85个连续的网站和约1000个运动GPS站。本文利用GPS反演的速度数据，结合刚体转动和弹性形变，研究了东北亚地区的运动学。我们发现，东北亚的变形可以很好地描述了一些旋转块体，这是独立于欧亚板块运动的统计意义上的99%以上的置信水平。华北板块与阿穆里亚板块的构造边界为阴山-燕山带，伸展速率约为2.4mm/a。沿着华北与华南的分界线，秦岭-大别断裂正以每年约3.1毫米的速度向左平移。Amuria和韩国区块的延伸速度约为1.8毫米/年。阿穆尔板块和欧亚板块之间的贝加尔裂谷正以每年约3.0毫米的速度扩张。Amuria和鄂霍次克地块之间9-17 mm/年的相对运动被东海-日本海沟带所容纳。秦岭-大别断裂带和阴山-燕山带附近的局部化变形可能是由于断层的震间闭锁而引起的弹性应变积累。
The plate tectonics of Northeast Asia are very complex with diffuse and sparse seismicity in the broad plate deformation zones embedded by a number of micro-plates, particularly the controversial Amurian plate. Now the increasingly dense GPS networks in this area provide an important tool to investigate plate tectonic kinematics and to identify the approximate plate tectonic geometries. In this paper, we have processed GPS data (1998–2005) collected by an extensive GPS network (China and South Korea) with more than 85 continuous sites and about 1000 campaign GPS stations. The kinematics of Northeast Asia is studied by modeling GPS-derived velocities with rigid block rotations and elastic deformation. We find that the deformation in Northeast Asia can be well described by a number of rotating blocks, which are independent of the Eurasian plate motion with statistical significance above the 99% confidence level. The tectonic boundary between the North China and Amuria plates is the Yin Shan–Yan Shan Mountain belts with about 2.4 mm/yr extension. Along the boundary between North China and South China, the Qinling–Dabie fault is moving left laterally at about 3.1 mm/yr. The Amuria and South Korea blocks are extending at about 1.8 mm/yr. The Baikal Rift between the Amurian and Eurasian plates is spreading at about 3.0 mm/yr. The 9–17 mm/yr relative motion between the Amuria and Okhotsk blocks is accommodated at the East Sea–Japan trench zone. Localized deformation near the Qinling–Dabie fault and Yin Shan–Yan Shan Mountain belts may be elastic strain accumulation due to interseismic locking of faults.