利用接收函数与面波资料联合反演研究郯庐断裂带鲁苏皖段及邻区壳幔S波速度结构

郯庐断裂带是纵贯中国大陆东部的一条深大断裂带，至今郯庐断裂带产生与演化的地球动力学机制仍存在争论。研究记录着该区域动力学演化过程的地壳上地幔深部结构特征是揭开该地学之谜的钥匙。然而，已有研究结果因有限的数据量、反演结果的不唯一性及各研究方法之间的差异性等原因，还存在一些争议和不足。因此，研究区亟待展开更为精细的深部结构探测研究。本项目基于更为密集的台阵分布，联合采用背景噪声和远震双平面波层析成像获得研究区宽频段基阶瑞利面波群/相速度纯路径频散曲线和方位各向异性，通过与接收函数的联合反演得到研究区精细的壳幔S波速度结构。通过分析郯庐带鲁苏皖段及邻区的壳幔结构特点和差异、不同深度层次上的各向异性特征，揭示主要构造单元之间的深部边界和速度结构差异，获得有关研究区域深部结构、壳幔耦合变形的认识，为郯庐带的产生与演化及强震活动深部动力机制研究等提供重要的基础资料。

Tan-Lu fault zone is a deep and great fault in the East China. Now, the geodynamics mechanism of the generation and evolution of the Tan-Lu fault zone still is disputed. Obviously, exploring the crust and upper mantle velocity structure recording regional dynamic evolution processes of the study area is the key of answer above questions. However, there are some controversies and shortages in the previous studies because of the limited amount of data, the uniqueness of inversion results and the differences between the various research methods. Therefore, more fine deep structure research should be urgently developed. In this project, based on a more intensive distribution of array, the broadband pure-path Rayleigh wave group/phase velocity dispersive data and azimuthal anisotropy will be established through joint usage of ambient noise and two-plane-wave tomography. Then, we use receiver function and surface wave to jointly inverse the fine crust-mantle S-wave velocity structure in the study area. By analyzing the crust-mantle velocity structure and difference, anisotropic characteristics at different depths in the study area，we hope to reveal the deep boundary and velocity difference between tectonic blocks, obtain some new knowledge about the deep structure and crust-mantle coupling deformation of the study area，and provide important basic information for the study of deep mechanism of strong earthquake occurring and evolvement in the Tan-Lu fault.