地震震源辐射过程是现代地震学中一个复杂而关键的课题 ,而震源谱的研究则是认识震源辐射的重要一环。地震波由震源传播至地球表面 ,经历了一系列诸如路径衰减、地壳表层放大和场地效应等物理作用。其中震波衰减效应包括几何扩散、非弹性衰减 (YQ(f) )和近地表高频衰减。地壳放大作用主要发生于表层或浅层波阻抗梯度带。为了更确切地描述和理解震源辐射谱 ,必须从观测到的地面运动记录中把地震源谱分离出来 ,从而消除传播路径和地表场地效应。强震运动记录是研究震源谱的基本资料。采用频率域方法 ,以傅里叶变换为工具 ,可使时间域的卷积问题简化为频率域的乘积运算。研究区域含日本、墨西哥、土尔其、加利福尼亚、加拿大西部(BritishColumbia)和北美东部 (ENA)等典型构造区。结果表明 ,在适当消除路径和场地效应之后 ,震源谱的基本特征只随震级变化 ,而与研究地区无直接关系 ,亦即震源谱基本独立于构造区域、震源距和震源深度。这对于未来强震运动预测和地震灾害评估具有十分重要的理论和实际意义。与此同时 ,高频衰减因子 (Kappa)与构造环境有关 :低Kappa工资值相应于较稳定的板内构造环境下的硬岩场地 (如北美东部 ) ,而相对较高的Kappa值则相应于比较活跃的构造环境下的场地条件 ,如日本、墨西哥、? Earthquake radiation process is a complex and key issue in modern seismology, while the study of source spectrum is an important part of understanding source radiation. Seismic waves propagate from the source to the Earth’s surface and undergo a series of physical effects such as attenuation of the path, amplification of the surface of the crust, and site effects. The seismic attenuation effects include geometric diffusion, inelastic attenuation (YQ (f)) and near-surface HF attenuation. The crustal amplification mainly occurs in the surface or shallow wave impedance gradient zone. In order to describe and understand the focal radiation spectrum more accurately, it is necessary to separate the seismic source spectrum from observed ground motion records, thereby eliminating the effects of propagation paths and surface effects. Strong motion records are the basic data for the study of source spectra. Using the frequency domain method, Fourier transform as a tool, the convolution problem in the time domain can be simplified as the product of the frequency domain. The study area includes typical tectonic zones such as Japan, Mexico, Turkey, California, British Columbia and North American East (ENA). The results show that after the path and site effects are properly eliminated, the basic features of the source spectrum only change with the magnitude, but are not directly related to the study area. That is, the source spectrum is basically independent of the tectonic area, source distance and focal depth. This is of great theoretical and practical significance for future earthquake motion prediction and earthquake disaster assessment. In the meantime, the high frequency attenuation factor (Kappa) is related to the tectonic setting: the low Kappa wage corresponds to the more stable hard rock field in the intraplate tectonic setting (eg, eastern North America) and the relatively high Kappa value corresponds to More active construction conditions of the site conditions, such as Japan, Mexico,?