【摘要】 利用河北测震数字台网2009年1月-2015年5月记录到的169个ML≥2.5地震(含山区和平原)4 180条波形资料,将河北(含北京、天津)及邻近地区作为研究区域,根据地形及地质构造将研究区域分为山区和平原两个区,采用三段几何衰减模型,用Atkinson(1992)方法计算各自的Q值,得到山区和平原的非弹性衰减Q随频率变化的关系式分别为:Q(f)=474.8f0.3589,Q(f)=294.5f0.5193,并与已有的结果进行对比。在此基础上,利用Moya(2000)方法进行震源谱和场地响应的联合反演,得到了93个基岩台、58个井下台的场地响应,基岩台的场地响应随频率的变化较为复杂。不同类型的基岩台场地响应绝大多数无明显的一致性特征;井下台站的场地响应随频率变化的形态基本一致,在低频段(1~7 Hz)表现为放大作用,在高频段(7~20 Hz)表现为衰减效应。更多还原

【Abstract】 In the paper,4180horizontal-component digital seismograms of 169 earthquakes recorded on 162 stations of Hebei Digital Tele-seismic Network during Jan.2009 to May 2015 are used in the researches for the entire Hebei region and adjacent domain,the study area is divided into two areas:the mountain area and the plain area according to the terrain and geological structure,the inelastic attenuations of the two areas are studied.Following a hinged tri-linear geometrical spreading model,the Q values are calculated for each area by Atkinson’s method and compared with the exited data.The frequency-dependent Qin the mountain and flat area are estimated as Q(f)=474.8f0.3589 and Q(f)=294.5f0.5193.Then,the source parameters and the site responses are inverted by the Moya’s method,the site responses of 93 bedrock stations and 58 underground stations are obtained.The site responses with frequency for bedrock stations are more complicated,most of the site responses of different types of bedrock stations have no obvious consistency.The site responses of the underground stations are basically consistent with the change of frequency,and the performance of the low frequency band(1~7Hz)is enlarged,and the high frequency band(7 ~ 20Hz)is the attenuation effect.更多还原