【摘要】 应用海城、唐山、莒县、平陆、荷泽地震的断层模型进行了激光全息光弹实验研究。实验结果获得了应作的等和线和等差线条纹图。 本文描述了唐山地震的实验结果,其结果与唐山地区地震地质资料基本相符。1.唐山等和线和等差线条纹图显示出三个应力集区,与唐山的主震和余震位置一致。2.唐山主应力轨迹线方向为东北方向。这个方向与华北现代构造应力场主压应力方向一致。 激光全息光弹实验方法可以用来探讨不同的构造形态在不同边界条件下的应力分布和变化,从而为较大地震预报提供线索。更多还原

【Abstract】 Fault models for earthquakes in Haicheng,Tangshan,Jusian,Pinglu and Heze are studied experimentally using laser holographic photoelashicity.From the experimental results,isopach and isochromatic fringe patterns of the faults are obtained.This paper describes the experimental results of the Tangshan earthquake which are in reasonable agreement with the seismological and geological data of the Tangshan districtt 1,Isopach and isochromatic fringe patterns of the Tangshen structures show three areas of strees concentration,corresponding of the locations of the main shock and the after shocks in the Tangshen earthguake.2.The direction of the main stress trajectory in the Tangshan district is ENE trending,in coincidence with that of the main compressive stress in North Chine’s modern tectonic stress field.The experimental method of laser holographic photoelusticity can be used to study the stress distribution and its variation in different tectonic units under different boundary conditions and hence to provide clues for large earthquake forecasts.更多还原