| Tanlu fault zone is the largest and most active in eastern China fracture of active faults,which TanCheng-xinyi section throughout the shandong and jiangsu provinces,1922 in TanCheng Ma Lingshan an earthquake of magnitude 8.0,causing enormous losses,and the surface dislocation outcrop is relatively clear,where the special topographical features is the use of unmanned aerial vehicle(uav)device and aerial photographic analysis technology,the tanlu fault zone activity is one of the ideal testing ground breaking research.The tanlu fault zone in the collection,sorting ever present study based on the research literature,using the uav aerial photography technology,the orthogonal projection like analysis,DSM image analysis,and combined with the field fault section survey and interpretation of the geological age,test and analysis technology,light in the study of tanlu fault zone tectonic evolution and fracture activity,determine TanCheng-xinyi period of fault displacement,the latest activity time and space distribution characteristics.Get the following main conclusions:(1)high-resolution uav aerial survey data can be used to study the activity of fault zone.3D digital terrain technology is used to reconstruct the tectonic geomorphology model of active fault zone,the DSM is used to restore the real ground object scene,and the DEM is used to study the distribution characteristics of fault scarp displacement.Compared with the traditional artificial topographic mapping method,this method has a higher degree of automation,higher flexibility;lower cost and higher efficiency,and is easy to be popularized.(2)aerial photogrammetry was carried out on the shandong segment of tanlu fault zone,and high-quality high-resolution topographic data were obtained.Through data analysis,the geometric distribution characteristics of faults are obtained,and the relationship between the displacements of gullies is analyzed.The high precision imaging technology is used to comprehensively analyze the tectonic topographical features of the fault zone and identify the tectonic location.According to the characters of relief and the characteristics of strata,not subject to any terrain factors images to obtain accurate profile,through comparing multiple sets of profile,distinguish caused by water and terrain ups and downs of gully and fault dislocation caused by the gully,combined with the surface vein analysis,estimates research areas such as markers of the biggest displacement caused by fracture dislocation about 60 meters.(3)through the analysis of high-precision topographic data in the research area,the vertical displacement distribution of several steep canyons on the fault is statistically analyzed.Based on the relationship characteristics of paleo-seismic and multi-seismic vertical dislocations revealed by the paleo-seismic sounding trough,it is concluded that the uplift amount of this fault is 7000±200mm.(4)through the analysis of the paleo-seismic sounding trough section and the dating sample test,the method of optical emission light dating with the sampling of the fault section was adopted to reveal the last time of the last paleo-earthquake in the hezhuang section of the fault,namely about 6000a since the latest active age.The average horizontal displacement rate was estimated to be 10mm/a and the average vertical displacement rate was 1.67mm/a.Combined with previous research data,8.5 magnitude earthquakes have occurred in history,and it is concluded that active faults in tancheng-xinyi section are strongly active faults in the late quaternary.Therefore,it is concluded that the probability of recurrence of major earthquakes in this section is very high,and great attention should be paid to it. |
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