摘要
本文通过历史强地震极震区内存在弱破坏现象的回顾 ,论述了李四光教授提出的“安全岛”概念 ,认为这种地壳构造上属活动性相对稳定的地块或岩块在重大工程选址上具有重要的意义。文中提出了地壳稳定性分级和分级的主要指标 ,把稳定性分为 4级 :稳定 ( Ⅰ) ;次稳定 ( Ⅱ) ;次不稳定 ( Ⅲ) ;不稳定 ( Ⅳ)。这些定性和半定量分级指标可作为工程建设地区地壳稳定性评价的依据。
The concept about “safe island” created by late Professor Li Siguang (J.S.Lee) is described in this paper from that there are a few weak destroyed districts in high intensity area of a strong earthquake. Author pointed out so called “safe island” means the area which belongs to relative stability massif from the point of view tectonic activity. The regional crustal stability grading and its main evaluation indexes are given in the paper.
出处
《地质力学学报》
CSCD
2001年第2期97-103,共7页
Journal of Geomechanics
