基于高精度地基LiDAR技术的活动断层错断地貌研究以冷龙岭活动断裂带为例

Abstract

Abstract: High precision topography measurement is an important approach to quantitative study of active fault. Through the measurement and analysis of the typical offset landform formed by strong earthquakes, we estimated the fault displacement, analyzed the historical process of the fault rupture, and revealed the recurrence feature of the strong earthquakes.Light Detection And Ranging (LiDAR) provides an important method to the study of fault rupture characteristics. We selected the Lenglongling active fault in the NE Tibetan plateau as target, and measured its typical fault offset topography by terrestrial LiDAR. And the key technical problems of the construction of the 3-dimensional fault landform by LiDAR data are studied and analyzed. For the measured point cloud data, we conducted point cloud matching, mosaic, plant filtering and irregular triangular mesh modeling processing, and then the 0.05 m high-resolution digital elevation model was generated. To identify and divide the geomorphic units, we implemented high resolution 3D reconstruction to the micromorphology and fault geometry of ridge fracture. High precision topography measurement results of the different offset values reveal that the fault zone have experienced multi-seismic events, and the fault zone mainly behaves left-lateral strike-slip activity with a slight dip-slip motion component.

Key words: Fault landform, Terrestrial LiDAR measurement, Point cloud data, Triangulated irregular network, Digital elevation model, Lenglongling fault

CLC Number:

P315.7

KANG Shuai,ZHANG Jing-fa,CU Xiao-feng,JIANG Wen-liang,JIAO Qi-song. Offset Landform Caused by Active Fault based on High Precision Terrestrial LiDAR Data: A Case Study of the Lenglongling Active Fault Zone[J]. EARTHQUAKE, 2017, 37(3): 61-71.

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Offset Landform Caused by Active Fault based on High Precision Terrestrial LiDAR Data: A Case Study of the Lenglongling Active Fault Zone

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[2]	HE Wen-gui, YUAN Dao-yang, GE Wei-peng, LUO Hao. Determination of the Slip Rate of the Lenglongling Fault in the Middle and Eastern Segments of the Qilian Mountain Active Fault Zone [J]. EARTHQUAKE, 2010, 30(1): 131-137.