断层附近强地震动半经验合成方法的研究  

Study on semi-empirical method of simulating strong ground motions near fault

作　　者：金星[1] 刘启方[1] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2002年第4期22-27,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目 (5 9895 410 )

摘　　要：本文对利用经验格林函数法合成断层附近的强地面运动等问题做了初步研究。基于云南施甸5 .9级主震和余震强震观测记录和本文提出的移动窗技术对断层附近的主震记录进行了分析识别 ,发现大震的Asperity(凸凹体 )与小震在时程和Fourier幅值谱上存在一定程度的相似性。这种相似性从理论上 ,可以解释为这种小震视为大震Asperity的“种子” ,大震的Asperity是由这些“种子”发育而成的。在此基础上合成了云南施甸距震中仅为 1.1公里的主震记录 。In this paper, some studies are made for synthesizing strong ground motions near fault by using empirical Greens function. The main and after shock records of Shidian earthquake (Ms=5.9) were analyzed and seismic source process of main shock was distinguished based on the moving window technique. By analysis of seismic source process of main shock, we find that there are some resemblance on time history and Fourier amplitude spectrum between small earthquake and the Asperity of large earthquake.The resemblance can be explained as that the small earthquake is the seed, which grows to be the Asperity of large earthquake. Based on this, the records of main shock are synthesized. Finally, this paper discloses some defects that small earthquake near fault is considered as empirical Greens functions.

关 键 词：断层 强地震动合成 经验格林函数 主震 余震 云南 施甸地震 

分 类 号：P315.3[天文地球—地震学] P315.9[天文地球—固体地球物理学]