地质通报Issue(1)：104-116,13.
基于LiDAR的海原断裂松山段断错地貌分析与古地震探槽选址实例
摘要
Abstract
In this paper, the authors first carried out a large-scale (1∶1000) tecto-geomorphic mapping in the vicinity of the Song⁃shan paleoseismic study site on the Laohushan section of the Haiyuan fault by using high resolution ( 1m) airborne LiDAR DEM and with the aid of topographic enhancement through GIS tools. New paleoseismic results in two trenches opened near two previously published ones less than 150m to the east were reported, which allows a comprehensive comparison of four trenches in such aspects as geomorphic setting, sedimentary environment, number of paleoseismic events and their deformation styles. The new paleoseismic re⁃sults reveal a discontinuous paleoseismic sequence at 37380 ± 880BP including 5 events with different levels of certainty. The authors found that despite the fact that these trenches are located within short distances from each other, the stratigraphic resolution and paleo⁃ seismic event evidence exposed considerable difference from trench to trench. This implies that paleosiesmic results, such as the total number and robustness of stratigraphic evidence of paleoearthquakes, strongly depend on site location. Favorable depositional environ⁃menrts for an excellent preservation of paleoseismic record include topographic lows such as pull-apart basins allowing for low-ener⁃gy and fine graine size deposition as well as high sedimentation rate for strike-slip fault. Examples presented here suggest that large-scale tecto-geomorphic mapping, especially based on the high-resolution topography, is important for site selection, and such an ex⁃ercise is a necesssary reconnaissance step before opening a trench to maximize the quality of paleoseismic investigation. Such a prac⁃tice also shows the great potential and usefulness of airborne LiDAR data in better quantification of fault rupture behavior and fault ac⁃tivity in general.关键词
机载LiDAR/GIS分析/古地震/微地貌填图/最佳探槽点/新机遇Key words
airborne LiDAR/GIS tools/paleoseismology/tecto-geomorphic mapping/new application分类
天文与地球科学引用本文复制引用
李占飞,刘静,邵延秀,张金玉,袁兆德,王鹏,唐茂云,王朋涛..基于LiDAR的海原断裂松山段断错地貌分析与古地震探槽选址实例[J].地质通报,2016,(1):104-116,13.基金项目
中国地震局行业专项（编号201208006）、国家自然科学基金项目（批准号41225010）和地震动力学国家重点实验室自主课题 （）
