GPS观测的嘉黎断裂西段典型构造区域地壳变形特征
The crustal deformation characteristics of typical tectonic region in the western segment of the Jiali fault derived from GPS observations
赵天祥 1苏小宁 1朱庆 2赵国强3
作者信息
- 1. 兰州交通大学测绘与地理信息学院,兰州 730070
- 2. 西南交通大学地球科学与工程学院,成都 611756
- 3. 中国地震局地震预测研究所,北京 100036
- 折叠
摘要
为了确认嘉黎断裂带西段的走滑与拉张并存地壳变形特征这一预研论断,通过在关键构造部位布设5个GPS流动观测站,获得区域现今地壳运动水平速度场,并结合跨断层GPS基线方法定量给出了不同断层的滑动速率.通过实验获得的大地测量观测资料,证明了地质学研究提出的变形特征的正确性,同时对滑动速率给出了定量分析.结果表明:嘉黎断裂带西段拉木青-桑地段为右旋兼挤压运动,右旋走滑速率为2.7±0.8 mm/a,挤压速率1.9±0.6 mm/a;位于嘉黎主断裂北侧的张性盆地,拉张速率2.8±1.0 mm/a,南侧张性盆地的拉张速率为2.1±0.5 mm/a.该文的研究成果可以更好地解释嘉黎断裂带西段的构造变形特征,并为研判青藏高原地壳变形的运动学特征提供技术参考.
Abstract
In order to confirm the pre research conclusion of the coexistence of strike slip and tension crustal deformation characteristics in the western section of the Jiali Fault Zone,this article sets up 5 GPS flow observation stations in key structural areas to obtain the current horizontal velocity field of crustal movement in the region,and quantitatively provides the sliding rates of different faults using the cross fault GPS baseline method.The geodetic observation data obtained through experiments have proven the correctness of the deformation characteristics proposed in geological research,and quantitative analysis has been provided for the sliding rate.The results show that the western section of the Jiali Fault Zone,from Lamuqing to Sangdi,exhibits dextral and compressional movements,with a dextral strike slip rate of 2.7±0.8 mm/a and a compression rate of 1.9±0.6 mm/a;The extensional basin located on the north side of the Jiali main fault has a tensile rate of 2.8±1.0 mm/a,and the tensile rate of the southern extensional basin is 2.1±0.5 mm/a.The research results of this article can better explain the structural deformation characteristics of the western section of the Jiali Fault Zone and provide technical reference for studying the kinematic characteristics of crustal deformation in the Qinghai-Xizang Plateau.
关键词
嘉黎断裂/GPS数据处理/跨断层基线/滑动速率/变形特征Key words
Jiali fault/GPS data processing/cross-fault baseline/slip rate/deformation charac-teristic引用本文复制引用
基金项目
国家自然科学基金项目(42174003)
国家自然科学基金项目(41604007)
甘肃省杰出青年基金项目(22JR5RA315)
兰州交通大学青年科学基金项目(2021003)
出版年
2024
NETL
NSTL
万方数据