南北地震带北段构造应力场与震中迁移关系的模拟实验

THE SIMULATED TEST ON THE RELATION BETWEEN THE TECTONIC STRESS FIELD IN THE NORTHERN PART OF NORTH-SOUTH SEISMIC BELT AND THE EPICENTRAL MIGRATION

摘要:

本文应用变形模拟、普通光弹和激光全息光弹性模拟方法,采用多种力源对南北地震带北段现代构造应力场分布特征进行了探讨。研究了该区各地段应力场的主压应力、主张应力展布方向,同时还绘制了主压应力、主张应力和最大剪应力等值线图,从而了解了该区各段在统一应力场作用下应力值的相对大小。文中还结合莫尔强度理论,分析了该区地震活动性,对该区现代构造应力场分布特征与震中迁移的关系进行了探讨。

Abstract:

The modern characteristics of distribution of the tectonic stress field in the northern part of North-south Seismic Belt are studied in this paper with distortion analogy,ordenary optic elastics and the simulated test of optic elastics of laser holography under various force sources.The paper deals with the principal compression stress,the main tension stress and their directions in this region.The isorithm of the principal compression stress in the region is given in this paper as well.Thus it can be known from the test mentioned above the stress value in the action of unified stress field in every segment of this region.With Moll strength theory,the seismicity here is made an analysis and a research is conducted to the.relation between the modern features of distribution of the tectonic stress field and epicentral migration.