【摘要】 笔者在详细的野外地质调查、地面高精度磁测和室内测试的基础上,综合地质、地球物理、地应力场和地震资料,系统地探讨了工作区的总体构造环境,认为燕山水库区域构造正趋稳定。 对地震基本烈度的评定,是采用了从大到小的三级判定法,即地震小区—潜在震源区—地震危险区方法来确定未来100年内可能发生M_L≥3级地震的地震危险区,然后在考察测区地震烈度随震中距衰减规律的基础上,同时虑及各地震危险区及邻区强震对坝区的迭加影响,得出了燕山水库坝区地震基本强度为Ⅵ度的结论。更多还原

【Abstract】 the techtonic background of the whole yan Shang, reservoir area is systematically discussed by combining the geological, geophysical, stress-field and seismic data which were based on the field geological investigation, high precision surface geomagnetic measurement and indoor testing, and it is suggested that the Yan Shang reservoir region is getting stable now.The basic seismic intensity of the dam-site is determined, first of all, by using a"big-to-small" threegrade method, that is the subdivision of earthquake area, earthquake-prone area, and area in danger of earthquake, It is, used to judge the areas in danger of earthquake where events with magnitude equal to or more than 3 are expected to occur in the coming 100 years, Secondly, in consideration of the law of attenuation of intensity with epicentral distance and the superimposition effects on the damsite from various areas in danger of earthquake and strong earthquakes in the vicinity, it is primarily concluded that the basic seismic intensity of the Yanshan Reservoir’s dam-site is Ⅵ degrees.更多还原