区域无整体旋转基准的研究与应用
胡新康1 王倩2 马青1 杜雪松1
1（中国地震局第一监测中心,天津 300180）
2（第二炮兵装备研究院四所,北京 100085）
摘 要本文通过对区域地壳运动速度基准的研究,提出了在地壳形变研究中区域无整体旋转基准的概念,并对该基准进行了详细的研究和论述,给出了具体的计算方法和4个重要性质。应用区域无整体旋转基准对中国大陆及周边地区的GPS观测数据进行了处理,给出在该基准条件下区域地壳运动速度场。这一速度场解释了多种类型的地壳运动现象和地形地貌现象。本项研究表明,在中国东部地壳运动存在着一个大的左旋运动态势,其范围覆盖了近一半的中国陆地面积,影响着中国整个东部和周边区域的地壳运动,中国东部现今的海岸线形态可能很大程度上归因于这种地壳运动,而且中国海岸线的“S”形曲线将会随着地壳运动变的更加弯曲。用给出地壳运动速度场对地壳形变运动与地震的一些关系做了一些新解释。
关键词 Tisserand条件 区域无整体旋转基准 GPS 地壳形变运动 中国东部地壳左旋运动
Research and Application of Regional No-Net-Rotation Reference Frame
Hu Xinkang Wang Qian Ma Qing Du Xuesong
(First Crust Monitoring and Application Center, CEA, Tianjin 300180) Abstract In the paper, we propose a new concept of regional No-Net-Rotation (NNR) reference frame for researching crustal movement based on the analysis of various regional reference frames. The algorithm and character of the regional NNR reference frame are studied and described, and the concrete calculation method is given. By analyzing various reference frames, we get an appraisable method of regional reference frames in studying crustal movement, and point out that the regional NNR reference frame has the character of least average velocity. Using this reference frame, we process the GPS data observed in Chinese mainland and the surrounding areas and get a new crustal movement velocity field. The new velocity field describes very well the different kinds of crustal movements, and topographic and geomorphic phenomena in Chinese mainland. The research indicates there is a large left- rotation movement trend in the East China, which covers nearly half of the land area in Chinese mainland and affects the crustal movement in the entire East China and the peripheral areas. We consider that the present-day coastline in China is just resulted from such a left-lateral movement, and coastline will be more curved in the future. In addition, the new velocity field also describes the new relation between crustal deformation movement and earthquake.