Abstract
Abstract. Seismic active faults are closely related to earthquake disasters. Active faults determine the location and magnitude of destructive earthquakes. Therefore, strengthening active fault investigation and research is one of the main ways to reduce earthquake disasters. Airborne LiDAR, as a measurement method that can quickly obtain large-area and high-precision DEM results, can not only obtain structural distribution features of large-scale study areas on a macro scale, and determine the location and trend of active faults, but also be used to identify microstructural landforms and take researches on fine geomorphic structural features. In this paper, based on the detailed introduction, analysis and summary of the technical schemes, data processing and application of the airborne LiDAR technique in the northern margin of the Qinling Mountains and the Huashan Piedmont Fault Zone, it was demonstrated on the basic methods and technical advantages in seismic active faults and geomorphological research work of the airborne LiDAR technology, and a new and efficient method for seismic fault study was provided.
Highlights
The structure of the earth's crust rock layer that breaks due to the force reaching a certain strength, and the structure that has obvious relative movement along the fracture surface is called a fault
In the study of seismic faults in China, traditional aerial photogrammetry or ground surveying (GPS / RTK or total station) is still the main technical means to carry out fault and geomorphological-related surveys
Compared with traditional measurement technology, the airborne LiDAR technology has great technical advantages and comprehensive economic advantages, which are mainly reflected in the following aspects: (1) The overall accuracy and fineness of the results are higher First of all, each point of the airborne LiDAR point cloud is directly measured by laser
Summary
The structure of the earth's crust rock layer that breaks due to the force reaching a certain strength, and the structure that has obvious relative movement along the fracture surface is called a fault. In a word, strengthening investigation and research on active faults is one of the main ways to reduce earthquake disasters Both the Qinling fault and the Huashan piedmont fault, which are located in the southern margin of the Weihe Basin in the Guanzhong region of Shaanxi Province, China, are earthquakeactive faults. The Huaxian (34.5° N, 109.7° E) where the Huashan Piedmont fault was located, had a major earthquake around 24 o'clock on January 23, 1556, which was called "Guanzhong earthquake" in history This earthquake is one of the most famous and historic earthquakes in China with the most extensive impact and the worst losses in one of the densely populated areas. In 2015, the airborne LiDAR work was implemented for further monitoring and researches for the Qinling fault and the Huashan piedmont fault
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