【摘要】 地震动衰减关系是影响地震安全性评价特别是地震区划结果的重要因素。我国现行的地震动衰减关系主要是依据6级以上地震的地面运动资料得到的,并没有考虑中强地震的衰减特性。为此,文中利用现有的烈度资料和其他可供参考的研究成果来建立我国中强地震活动区的地震动衰减关系。收集了我国华中、华南、东北等地区的51次地震的烈度等震线资料,运用单随机变量加权最小二乘回归法得到中强地震活动区烈度衰减关系。然后以美国西部地区为参考地区,运用缺乏地震动参数的地震动估计方法—地震对映射法得到中强地震活动区峰值加速度和有效峰值加速度衰减关系。最后,通过与我国强地震区和中强地震区已有的烈度衰减关系和地震动衰减关系的对比,验证了得出的我国中强地震活动区烈度衰减关系和地震动衰减关系的合理性。更多还原

【Abstract】 Ground motion attenuation relationship is a key factor for the seismic hazard assessment,especially for compiling seismic zone map.The current ground motion attenuation relationship is obtained based on the Ms 6.0 or larger earthquakes without considering the attenuation features of moderate earthquakes.Therefore,this paper tries to get the intensity and ground motion attenuation relationship through collecting the intensity records of moderate earthquake regions and taking advantage of the previous research results.By collecting the intensity records from Central China,South China and Northeast China,the intensity attenuation relationship is obtained by using the single variable weighted least square regression method.Then,taking western United States as a reference region,the ground motion attenuation relationships of PGA and EPA are obtained accordingly by the mapping method i.e.the ground motion assessment method for lack of ground motion parameters.Finally,the comparison between the previous intensity and the ground motion attenuation relationships of the strong earthquake area and moderate earthquake area and that of this paper is made for verifying the rationality of the results.更多还原