极震区的地震动与潜在震源区内重大工程安全

潜在震源区是未来可能发生破坏性地震的震源所在地区 ,区内的地震属近场或“直下型” ,其地震破坏和地震动特征相应于已发生地震的极震区。近期国内外诸多强烈地震的实际资料和相关研究成果表明 ,直下型地震不仅地震峰值加速度大 ,且竖向和水平峰值加速度比值也有别于远场地震的统计关系。文中从极震区岩土体破坏、地震动特点及地震地质灾害等方面对潜在震源区内的重大工程问题进行了探讨

STRONG GROUND MOTION AT MEIZOSEISMAL AREA &|SAFETY OF IMPORTANT ENGINEERING PROJECTS AT POTENTIAL EARTHQUAKE REGION

Potential earthquake regions are the hypocenter areas of future destructive earthquakes that might be of either near field type or direct-underground one. The characteristics of destruction and ground motion of the earthquakes in these regions are similar to those of meizoseismal areas of past earthquakes. The existing data and associated research of some recent earthquakes occurred in China and abroad indicate that: direct-underground earthquakes not only demonstrate very high peak accelerations, but also show ratios of peak vertical acceleration to peak horizontal one that are quite different from those of far field earthquakes. In this paper, authors also discuss safety issues of important engineering projects located in potential earthquake prone regions in the following aspects: rock mass & soil failure at meizoseismal areas, ground motion characteristics and seismo-geological hazards etc.