μm级形貌测量系统——一种新型的断层面微观形貌测量技术  

MICROMETER SCALE MORPHOLOGY MEASUREMENT SYSTEM: A NEW TECHNIQUE FOR MICRO-TOPOGRAPHY MEASUREMENT ON FAULT PLANES

作　　者：郝海健 魏占玉[1] 何宏林[1] 刘力强[1] 郭玲莉[2] HAO Hai-jian;WEI Zhan-yu;HE Hong-lin;LIU Li-qiang;GUO Ling-li(State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China;College of Marine Geosciences,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国地震局地质研究所,地震动力学国家重点实验室,北京100029 [2]中国海洋大学,海洋地球科学学院,青岛266100

出　　处：《地震地质》2020年第4期955-967,共13页Seismology and Geology

基　　金：中国地震局地质研究所基本科研业务专项(IGCEA1519)资助。

摘　　要：获取高精度断层面形貌对微观断层面形貌与地震成核、破裂扩展及终止的相关性研究具有重要意义。为了提高断层面形貌的测量精度、克服现有测量方法的不足,我们研发了一套具有自主知识产权的μm级形貌测量系统。经过测试,该新型μm级形貌测量系统具有以下特征:1)其平面定位(x轴与y轴方向)精度优于3. 5μm,垂向测量精度优于4. 5μm,水平分辨率可达0. 62μm,垂向分辨率为0. 25μm;2)该系统在垂向发射激光束,可测量形貌面中大倾角的凹谷区域,避免产生数据空白,可获得完整的形貌测量结果,具有较强的陡峭表面测量能力;3)该系统具有较大的测量量程(30cm×30cm),测量大尺度样品时,可避免多次测量数据的配准拼接以及由此带来的误差。运用该形貌测量系统,可对实验断层面进行扫描并获得高分辨率的形貌数据,能够满足μm级尺度上的形貌分析要求。Earthquakes commonly occur in the sliding surface of the fault zone.The morphology of the sliding surface is the result of fault activities,and also it evolves with the activities.The irregular geometry of the fault plane affects the sliding resistance,the concentration and anisotropy of the stress distribution within the fault plane and the fault shear strength.So,the acquisition of high-precision morphological features is of great significance for studying the correlation between fault surface morphology and seismic nucleation,fracture propagation and termination.Due to the lack of reliable micron-scale morphological measurement apparatus,the study of the coherence of the fault surface morphology from large scale(unit:m-cm)to small scale(unit:μm)is subject to restrictions,as well as the study of the relationship between the micro-morphology of the experimental frictional surface and the rupture process.In order to improve the measurement accuracy of the fault plane and overcome the shortcomings of existing measurement methods,we have invented a morphology measurement system with independent intellectual property rights.The measuring principle of this morphology measurement system is based on the laser rangefinder theory.The frame of this system consists of four parts:Braced Frame,Moving Scanner Unit,System-Controlling Unit and Data Collection Unit.Braced Frame is made up of high-adjustable frame,loading stage,dust-proof box and isolation platform,which is used to provide a vibration isolation,light proof and dust-proof measuring environment.Moving Scanner Unit contains a laser head and a two-dimensional translation stag,the laser head is used to measure vertical distance and a two-dimensional translation stage carrying a laser head moving in X-axis and Y-axis orientation to provide X,Y coordinate values.System-Controlling Unit includes two-dimensional translation stage controller,laser head controller and signal convertor.The function of this part is mainly to control operation of other parts.The Data Collecti

关 键 词：形貌测量系统 断层面 精度分析 

分 类 号：P542[天文地球—构造地质学]