孕震过程中几个典型形变场的实验研究  

Experimental and Comparative Research of the Deformation Fields during Some Typical Earthquakes Preparation Processes

作　　者：胡毅力[1] 文丽敏[1] 杨润海[2] 吴小平[1] 

机构地区：[1]云南大学地球物理系,昆明650091 [2]云南省地震局,昆明650224

出　　处：《地震研究》2006年第2期182-187,共6页Journal of Seismological Research

基　　金：云南省自然科学基金(2002D0007M)资助

摘　　要：采用激光实时干涉计量技术,观测刻有不同“构造”的试样在加压过程中的形变,研究不同破裂孕育区所表现的不同应变异常场特征。其实验结果与大同6.1级地震前后的应变场分布和运用雷达差分干涉技术测量的西藏玛尼地震、张北—尚义地震后的形变结果对比发现:(1)在一个大地震前后,孕震区出现特征形变场并可以由实验验证;(2)激光实时干涉计量技术与雷达差分干涉技术相似,激光全息技术可以在各种模拟条件下研究多种形式的形变异常场特征。建议用雷达差分干涉技术测量和研究孕震过程中的形变场特别是临近大震发生前的形变场特征,并进行相应的实验和观测研究。Using laser real time interfering and measuring technology, we observe the deformation during the procedures pressing on the rock samples with different structures, and study the deformation characteristics in different crack preparation areas. Compared the experimental result with the strain field before and after the Datong M6. 1 earthquake, and with the deformation results after the Mani, Tibet, earthquake and Zhangbei-Shangyi earthquake using radar difference interfering technology, it is found： （ 1 ） the characteristic deformation field will appear before and after a strong earthquake, which can be validated by experiment; （2） similar to the radar difference interfering technology, the laser real time interfering and measuring technology （the laser holograph technology） can be used to study the anomaly features of deformation field under various simulation conditions. It is thought that the radar difference interfering technology should be applied in the future to the research of the deformation field before especially very close to a strong earthquake and some related experiments should be done.

关 键 词：激光干涉技术 雷达差分干涉技术 形变异常干涉条纹图 孕震区 形变异常场特征 

分 类 号：P315.8[天文地球—地震学]