Shandong Earthquake Agency

郯庐断裂带是我国东部地区最为重要的大型活动断裂之一，具有较强的发震能力，断裂带沿线多处穿过人类活动及聚集的城市。为了研究郯庐断裂带的几何展布及活动性特征，选取郯庐断裂带的沂沭断裂莒县至郯城范围为研究对象，考虑东部地区植被覆盖，采用机载激光雷达和地基激光雷达手段采集了断裂带沿线左山(一步涧)段、钟华山段、岌山段、马陵山段以及蒋家岭等地高精度地形数据，对断裂的滑动分布特征进行分析。通过对测量得到的点云数据进行点云匹配、镶嵌、植物滤除以及不规则三角网建模处理，得到了0.1 m空间分辨率的数字高程模型(Digital Elevation Model，DEM)，实现了对断裂微地貌形态的高清晰度三维再现，提取了断裂断错冲沟右旋水平位错量和断层陡坎垂直位错量，结合地质填图和探槽揭露的古地震事件进行验证和对比，对郯庐断裂带莒县至郯城段的断层活动特征进行了定量分析。结果表明，沿断裂带左山(一步涧)段、钟华山段、岌山段和马陵山段的水平和垂直位错量具有分级特征，晚第四纪以来可能发生过多期(3~5次)活动和多次古地震事件。研究成果为进一步研究郯庐断裂运动学和几何学提供了重要依据，同时也说明地基激光雷达和机载激光雷达技术在活动断层研究中有着广泛的应用前景。

The Tancheng-Lujiang fault zone (also referred to as the TanLu fault zone), one of the most significant large-scale active faults in eastern China, has great seismogenic potential while passing through several cities with the activities and accumulation of human beings. To investigate the geometric distribution and activity characteristics of the TanLu fault zone, this study focused on the Juxian-Tancheng segment of the Yishu fault zone—a part of the TanLu fault zone. Given the vegetation coverage in eastern China, airborne light detection and ranging (LiDAR) and terrestrial laser scanning were employed to collect high-precision topographic data of the Zuoshan (Yibujian), Zhonghuashan, Jishan, and Maolingshan segments of the Yishu fault zone, as well as the Jiangjialing area. Based on these data, this study analyzed the slip distribution of the faults. The measured point cloud data were processed through point cloud matching, mosaic, vegetation filtering, and triangulated irregular network (TIN)-based modeling. As a result, a digital elevation model (DEM) with a spatial resolution of 0.1 m was obtained. This model allowed for a high-definition three-dimensional reconstruction of the microgeomorphic features of faults. Furthermore, this study extracted the dextral horizontal offset amount of fault-controlled gullies and the vertical offset amount of fault scarps. Based on these data, as well as the validation and comparison with the paleo-earthquake events revealed by geological mapping and trenches, this study conducted a quantitative analysis of the fault activity characteristics in the Juxian-Tancheng segment of the Yishu fault zone. The results indicate that the horizontal and vertical offset amount along the Zuoshan (Yibujian), Zhonghuashan, Jishan, and Maolingshan segments of the Yishu fault zone exhibit grading characteristics, suggesting multi-phase (3‒5 times) activities and multiple paleo-earthquake events since the Late Quaternary. The findings of this study will provide an important basis for further research on the kinematics and geometry of the Tan-Lu fault zone. They also demonstrate the wide application prospects of terrestrial laser scanning and airborne LiDAR in research on active faults.

山东省地震局重点业务专项项目(YW2303)；山东省地震局科技创新团队培育专项项目(TD202303)；山东省防震减灾“十三五”规划项目(SD135-2-3)

杨彬，王华林，吴洪斌，等. 高精度LiDAR技术在活动断层断错地貌研究中的应用−以沂沭断裂带莒县至郯城段为例[J]. 煤田地质与勘探，2023，51(12)：57−68.

YANG Bin，WANG Hualin，WU Hongbin，et al. Application of high-precision LiDAR technology in research on active fault-induced offset geomorphic features - A case study of the Juxian-Tancheng segment of the Yishu fault zone[J]. Coal Geology & Exploration，2023，51(12)：57−68.