Experimental study on geologic mapping of active tectonics based on LiDAR data - A case of Dushanzi anticline-reverse fault zone in Xinjiang

被引：0
作者：
Wei, Zhan-Yu [1 ]
He, Hong-Lin [1 ]
Gao, Wei [1 ]
Xu, Xi-Wei [1 ]
Gan, Wei-Jun [1 ]
Wei, Lei-Hua [1 ]
机构：
[1] Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing
来源：
Dizhen Dizhi | 2014年 / 36卷 / 03期
关键词：
Dushanzi anticline-reverse fault zone; LiDAR; Mapping of active fault;
D O I：
10.3969/j.issn.0253-4967.2014.03.019
中图分类号：
学科分类号：
摘要：
Airborne LiDAR (Light Detection And Ranging) provides a more advanced technique and more accurate basic data to describe geomorphological features and the latest surface deformation associated with active tectonics. How to apply this new technique and dataset to mapping of active fault and seismic hazard assessment is an important trend in the field of active tectonics. Taking the Dushanzi anticline-reverse fault zone in Xinjiang as test area, we made an experimental study on geologic mapping of active tectonics based on the LiDAR data. Firstly, we collected raw data using the airborne LiDAR technique, and obtained a raw point-cloud with a point density of 6.6 points/m2 and an average space of 0.39 m between any two points. Secondly, using twelve ground control points (GCP) which is acquired by static GPS measurement with accuracy up to millimeter, we evaluated the vertical error of the ground point-cloud data with density of 6.4 points/m2, and the result shows a vertical error of 0.12 m, mean square value 0.078 m. Finally, using the inverse distance weighting algorithm, we obtained the digital elevation model (DEM) of 0.5m-resolution. The resolution of the DEM is high enough to describe and analyze spatially the fine feature of tectonic landform of the Dushanzi anticline-reverse fault zone. In this paper, we identify the fine tectonic landforms using merely the DEM visualization tools based on different virtual perspectives, different shades or different treatment methods. The active tectonics and their distribution identified based on the high resolution DEM derived from LiDAR are not only consistent with previous results identified from air-interpretation and field investigation, but also finer and more precise than the latter. In addition, these methods of data acquisition, quality inspection and data processing introduced in this paper are also applied to other active fault researches in which LiDAR data have been acquired.
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页码：794 / 813
页数：19
相关论文
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