孙海霞, 杨选, 林向东, 侯丽娟, 鲁跃. 北京及邻区Q值及台站场地响应分析[J]. 华北地震科学, 2018, 36(3): 1-11. DOI: 10.3969/j.issn.1003-1375.2018.03.001
引用本文: 孙海霞, 杨选, 林向东, 侯丽娟, 鲁跃. 北京及邻区Q值及台站场地响应分析[J]. 华北地震科学, 2018, 36(3): 1-11. DOI: 10.3969/j.issn.1003-1375.2018.03.001
SUN Hai-xia, YANG Xuan, LIN Xiang-dong, HOU Li-juan, LU Yue. Analysis on the Q Value and Station Site Response in Beijing and Its adjacent areas[J]. North China Earthquake Sciences, 2018, 36(3): 1-11. DOI: 10.3969/j.issn.1003-1375.2018.03.001
Citation: SUN Hai-xia, YANG Xuan, LIN Xiang-dong, HOU Li-juan, LU Yue. Analysis on the Q Value and Station Site Response in Beijing and Its adjacent areas[J]. North China Earthquake Sciences, 2018, 36(3): 1-11. DOI: 10.3969/j.issn.1003-1375.2018.03.001

北京及邻区Q值及台站场地响应分析

Analysis on the Q Value and Station Site Response in Beijing and Its adjacent areas

  • 摘要: 基于北京及邻区区域测震台网2009年4月至2016年9月记录到的110个地震的波形资料,运用Atkinson、Moya方法分别研究了北京及邻区的Q值和场地响应;结合地质构造,我们将研究区域划分为3个区:一区(平原区)、二区(延怀盆地)和三区(燕山地区),计算出各区的Q值:Q1f)=182.00f0.7073Q2f)=191.81f0.6215Q3f)=486.12f0.3506,讨论了各分区Q值的差异和原因,并与现有Q值结果进行对比;通过计算,获得了126个台站(51个非基岩台和75个基岩台)的场地响应。结果表明:在频域1~20 Hz范围内,非基岩台(全部位于一区)场地响应形态比较一致,低频放大,高频衰减,场地响应最大为8,放大与衰减临界频率约为6~13 Hz,最小衰减至0.1以下;大部分基岩台低频段放大不明显,三区基岩台场地最稳定。

     

    Abstract: With waveform data of 110 earthquakes occurred during April 2009 to September 2016 recorded by stations of Beijing and its adjacent regional seismic networks, we studied the Q value and site response of Beijing and its adjacent areas by the methods of Atkinson and Moya respectively. Combined with the tectonic settings, the research area is divided into three zones:Plain area (1), Yanhuai basin (2) and Yanshan mountain area (3).We got Q value of each zone respectively, discussed the differences and causes of Q value in each zone, and compared them with previous results. Q value of each zone is:Q1(f)=182.00f0.7073,Q2(f)=191.81f0.6215,Q3(f)=486.12f0.3506.We obtained 126 stations' site responses (including 51non-bedrock stations and 75 bedrock stations). The results show that, in the frequency range of 1~20 Hz, the non-bedrock station site responses (all in Plain area) have common features of amplification at low frequency and attenuation at high frequency. The maximum of the site response value reaches 8, the critical frequency between amplification and attenuation is about 6~13 Hz, and the lowest site response value is below to 0.1. Most of bedrock stations' site amplification effects at low frequency are not obvious, and the site responses of bedrock stations in Yanshan mountain area are relative more stable.

     

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