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Title:: Inelastic Attenuation Value Q and Site Response in the Northeastern Margin of Qinghai-Tibet Plateau

作者:: 郭晓¹; 2; 张元生¹; 2; 莘海亮¹; 李稳¹; 张武民¹; (1.中国地震局兰州地震研究所,兰州 730000; 2.中国地震局地震预测研究所兰州科技创新基地,兰州 730000)

Author(s):: GUO Xiao¹; 2; ZHANG Yuan-sheng¹; 2; XIN Hai-liang¹; LI Wen¹; ZHANG Wu-min¹; (1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China)(2.Lanzhou Base of Institute of Earthquake Prediction,CEA,Lanzhou 730000,Gansu,China)

Keywords:: inelastic attenuation value Q; site response; Northeastern margin of Tibet Plateau

摘要:: 根据甘肃数字地震台网21个子台的437条波形记录,采用三段几何衰减模型,利用Atkinson方法和遗传算法,研究了青藏高原东北缘地区的非弹性衰减Q值和各台站的场地响应,得到该地区非弹性衰减Q值与频率f的关系为:Q(f)=564.7f ^0.3; 21个子台中,除了武都、合作、湟源、定西和迭部等台的场地响应总体上没有放大效应以外,其余台站均存在较明显的放大效应。

Abstract:: According to 437 horizontal-component seismograms recorded at 21 stations of Gansu Digital Seismic Network,we used Genetic Algorithm and Atkinsons method to study the inelastic attenuation value Q of the northeastern margin of Qinghai-Tibet plateau and the site response of each station based on the trilinear geometrical spreading model.The results indicate that the frequency-dependent of inelastic attenuation value Q in the studied area is estimated as:Q(f)=564.7f ^0.3.The site response shows significant amplification at every station except for the Wudu,Hezuo,Huangyuan,Dingxi,Diebu stations.