目前在中国地的变形受到全球定位系统测量的限制
Q Wang1, P Z Zhang, J T Freymueller
1Institute of Seismology, China Seismological Bureau, Wuhan 430071, China.
Science (New York, N.Y.)
|October 20, 2001
概括
全球定位系统 (GPS) 的测量显示,中国地的缩短吸收了印度-欧亚洲板块运动的90%以上. 在西藏高原的西藏高原.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 板块运动学 板块运动学
背景情况:
- 印度与欧亚大陆的碰撞导致地显著变形.
- 了解这种变形的分布是板块构造学的关键.
- 之前的研究已经使用了各种地质物理方法来评估区域应变.
研究的目的:
- 使用GPS数据量化印度 - 欧亚板块收的分区.
- 确定西藏高原及其周边地区对这种趋同的贡献.
- 研究西藏高原南部向东的运动及其适应机制.
主要方法:
- 对中国各地高精度全球定位系统 (GPS) 测量的分析.
- 地测数据处理以导出地速度.
- 动力学建模用于解释变形模式和板块相互作用.
主要成果:
- 地的缩短适应了印度大部分透到欧亚大陆的情况.
- 西藏高原及其边缘 (喜马拉雅山脉,阿尔廷塔格,吉利安山) 吸收了90%以上的相对板块运动.
- 西藏高原的内部缩短占总收的三分之一以上.
- 南部的西藏高原表现出相对于印度和欧亚大陆的东向运动,通过旋转在东部的Syntaxis周围来适应.
- 北方和南方中国块相对于稳定的欧亚大陆,分别以每年28毫米和611毫米的速度连贯向东南移动.
结论:
- 地变形,主要是缩短,是适应印度 - 欧亚板块收的主要机制.
- 西藏高原在通过内部变形和边界相互作用吸收这一趋同的很大一部分方面发挥着至关重要的作用.
- 在西藏高原内和东部观察到明显的运动行为,突出显示了复杂的区域构造学.
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