强震前闭锁段周围应力场的某些特点

1972年召开的地应力会议发表了一篇探讨地震破坏模式的论文:“一个平面剪切破坏前的应力场”。该文认为地震孕育过程晚期,断层填充物失去了抗剪能力。地壳构造运动使断层增长的剪切荷载都集中在闭锁段上。由此可导出临震前地应力分布特征:离震源稍远处总有一个主应力指向震源(即闭锁段)。

SOME CHARACTERISTICS OF STRESS FIELD AROUND BLOCK. SEGMENTS IMMEDIATELY BEFORE STRONG SHOCK WAVES TAKE PLACE

This paper deals with some characteristics of the stress field around the block-segments of faults immediately before strong shock waves take place. Analytic results show that the main additional stresses are all directed at the block-segments of faults with the exception of some narrow areas. This has been confirmed by data on the stresses measured a number of times immediately before some strong shocks. Thus, dangerous zones of strong earthquakes can be determined if precise measurements of ground stresses are available.