【摘要】 本文介绍了1986年以来在一些活断层上进行断层气体定点观测研究的有关情况及结果。1987年以来发生在甘肃西部的5次4.5级以土地震前均观测到了断层气体的动态异常变化。地震前断层气体的动态异常表现出变化幅度大,临震异常突出,多种气体组份同步变化等特点。一个五级左右地震的前兆反映范围可达500多公里。作者认为该方法适宜于在地震危险区进行临震监测。更多还原

【Abstract】 In this paper, the observational researches and results of fault gases at fixed points along some active faults since 1986 are introduced. The dynamic precursory variation of fault gases is observed before 5 earthquakes (M_s≥4.5)occurred in west Gansu Province since 1987. The dynamic precursors of fault gases before the earthquakes have following characteristics: variation range is wide; precursors immediately before events are prominent; the components of many kinds of gases change simultaneously, etc. For an about M=5 earthquake, its precursory range may reach 500 km. The authors consider that the method is suitable for monitoring immediately before event in seismic risk areas.更多还原