| 东亚地区现代地壳运动特征与构造变形 |
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| 引用本文： | 任金卫,马宗晋.东亚地区现代地壳运动特征与构造变形[J].地学前缘,2003,10(Z1):58-65. |
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| 作者姓名： | 任金卫 马宗晋 |
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| 作者单位： | 中国地震局,地质研究所,北京,100029 |
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| 摘 要： | 根据“中国地壳运动观测网络”首次发布的GPS观测结果以及国际地球自转服务中心在 2 0 0 0年发布的ITRF97下的站速度矢量和“东南亚地球动力学项目”GPS网的观测结果 ,讨论了东亚地区现今地壳运动和构造变形特征。在ITRF97参考系下 ,中国大陆东部现今地壳运动以向南东方向(12 0 130°)运动为主 ,量值平均为 35mm/a ,西部受印度板块向北东碰撞的影响 ,运动方向发生偏转 ,呈显北东—近东西向运动 ,但这种影响涉及的范围达到了准噶尔盆地北缘一线 ,说明碰撞型板块边界对板内变形的影响远大于俯冲型板块边界。平均来看 ,75 %以上的印度板块相对于欧亚板块间的南北向缩短是通过地壳增厚变形来吸收的 ,这意味着在调节整个青藏高原构造变形的过程中 ,逆断和地壳增厚起了主要的作用。东南亚块体总体上与欧亚板块的运动有所差异 ,相对于欧亚大陆有 10mm/a左右向东的运动。菲律宾板块南部向西的运动速度只有 2 4mm/a。包括华南地块在内的东南亚块体的运动不仅仅是与印度板块的碰撞过程有关 ,也应当与沿着东南亚块体东边界的俯冲过程有关。
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| 关 键 词： | 地壳运动 构造变形 GPS 东亚地区 |
| 文章编号： | 1005-2321(2003)S0-0058-08 |
| 修稿时间： | 2003年4月30日 |
CRUSTAL MOVEMENT AND TECTONIC DEFORMATION OF EASTERN ASIA |
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| REN Jin-wei,MA Zong-jin.CRUSTAL MOVEMENT AND TECTONIC DEFORMATION OF EASTERN ASIA[J].Earth Science Frontiers,2003,10(Z1):58-65. |
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| Authors: | REN Jin-wei MA Zong-jin |
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| Abstract: | The Crustal movement and the active tectonic deformation in eastern Asia is determined based on the GPS observations from Crustal Movement Observation Network of China, GEDYSSEA GPS network in southeastern Asia and the ITRF97 solutions of IERS. Within the reference of ITRF97 frame, China continent moves towards southeast (120~130°) at a speed of about 35 mm/a. The velocity vectors in western China are changed to northeast affected by the collision between Indian and Eurasian plate. The northern boundary of the area affected by the collision is limited to the north edge of Jungger basin, indicating that the area affected by the collision boundary is much larger than that of subduction boundaries. On the average, more than 75% of the north-south shortening between India and Eurasia is absorbed by crustal thickening strains. The movement of southeast Asia block is different from that of Eurasia plate. It moves 10 mm/a faster eastward relative to Eurasia plate. The southwest part of Philippine plate moves westward at about 24 mm/a, less than what the NUVEL-1A predicted. Many of the deformational features in eastern Asia appear to be more likely a consequence of the anticlockwise rotation of southeast China block relative to Siberia than that of the collision between India and Asia. The movement of southeast Asia is likely a result of a combination of forces associated with the subduction processes along the eastern margins of southeast Asia as well as the collision between Indian and Eurasian plate. |
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| Keywords: | crustal movement tectonic deformation GPS Eastern Asia |
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