山西地震预警台网基准站场地响应研究  

Research on Site Response of Seismic Early Warning Base Stations in Shanxi Seismic Alerting Network

作　　者：刘炜 李文超[1,2] 白伟利[1,2] 殷锴 LIU Wei;LI Wen-chao;BAI Wei-li;YIN Kai(Datong Earthquake Monitoring Center Station,Shanxi Earthquake Agency,Datong,Shanxi 037000,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Taiyuan,Shanxi 030025,China)

机构地区：[1]山西省地震局大同地震监测中心站,山西大同037000 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025

出　　处：《山西地震》2023年第2期23-27,共5页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-2202)。

摘　　要：应用H/V噪声谱比法,计算分析山西地震预警台网基准站0.1~20 Hz的场地响应。结果表明,39个台站的场地响应曲线无明显放大,8个台站的中频段有较明显放大,15个台站的高频段有较明显放大,15个台站的起伏较大。结合台站地理位置、地质构造、地形地貌等基础资料分析发现,台站的地理位置、空间分布和台基局部地质构造对场地条件的影响不具有规律性。台站在基岩山地的场地条件大部分较好,场地响应曲线平滑且未出现明显放大,能较好地记录地震动。由于地下地质结构的复杂性,有部分在基岩山地的台站存在明显的场地放大作用。受风化、流水侵蚀的场地因条件较差,存在明显的场地放大作用。The site response of base stations in the Shanxi seismic early warning network is analyzed using the H/V noise spectral ratio method in the frequency range of 0.1 to 20 Hz.The results show that 39 base stations exhibit no significant site amplification in their response curves,while 8 base stations show amplification in the mid-frequency range,15 base stations exhibit amplification in the high-frequency range,and 15 base stations show significant variations in their response curves.Analysis combining the base station's geographical location,geological structure,and topography reveals that the spatial distribution and local geological structures do not exhibit regular patterns in their influence on site conditions.Most base stations located in bedrock mountain areas have relatively favorable site conditions with smooth response curves and no significant amplification,allowing them to effectively record ground motion.However,due to the complexity of underground geological structures,some base stations in bedrock mountain areas still exhibit noticeable site amplification.Sites affected by weathering and erosion show poorer conditions and significant site amplification.

关 键 词：山西地震预警台网 H/V噪声谱比法 场地响应 

分 类 号：P315.73[天文地球—地震学]