Study On Deformation Characteristics And Current Activity State Of Crustal Structure In Beijing And Its Adjacent Areas

The crustal deformation process of the earthquake,the occurrence and the post-earthquake adjustment is the most intuitive phenomenon in the earthquake process,studied the spatial and temporal dynamics of crustal movement and deformation,and researched the overall situation and local accumulation and concentration of crustal stress and strain in the process of earthquake,knew more clearly about the changes in the characteristics of the crustal deformation and the current state,combined with active structures and seismic activity,to find its contact with the earthquake,the occurrence and post-earthquake adjustment?Beijing and its adjacent areas are located at the junction of Zhangjiakou-Bohai tectonic belt,North China Plain tectonic belt and Shanxi tectonic belt,earthquakes and geologic environments are complex,newly constructed activities are more intense,active faults are also more developed fracture,earthquake activity is more active?From this it seems,it is of great significance to strengthen the study of crustal movement and seismic activity in this region?We selected Beijing and its neighboring areas as a region for analysis and research,comprehensive collection,collation and use of the region's rich seismic observations and GPS observation data.The content of this paper is mainly for the following three parts:1)Using hypoDD to reorient 11796 earthquakes from 2002 to 2015,obtained 9311 high-quality earthquake event relocation results,obtained the distribution of the epicenter,the depth distribution of the source,the distribution of the earthquake along the faults and perpendicular to the faults.Analyzed the relationship between the spatial distribution characteristics of the earthquake and the active tectonic zone and the active fault zone is analyzed,and the segmentation activity of the structural belt and the active fault zone and its current state of activity.Presumed the extension of the known active fault zone in the study area and the presence of possible buried faults.Obtaining the active situation of the crust which is reflected by the seismic activity and deepen the understanding of the seismic activity and the structural characteristics of the study area.2)The GPS observation data of Beijing and its adjacent areas from 2006 to 2016 were processed by GAMIT/GLOBK and QOCA.And obtained NEU time series,NE direction and NW baseline time series,ITRF2008 frame and the velocity field and the main strain rate field.The characteristics of the crustal movement,the vertical motion,the stress field,the dynamic and dynamic characteristics of the active fault,the structural belt of the Zhangjiakou-Bohai tectonic belt and local crust in the current state of motion are analyzed quantitatively and visually.3)On the basis of the above research,combined with cross-fault observation,focal mechanism solution and InSAR and other previous research results,analyzed the present crustal tectonic deformation characteristics of Beijing and its adjacent areas,the current activity state,the characteristics of fault(zone)activity and its relationship with seismic activity.