基于HVSR法的宁夏北部预警台站场地响应研究  

Research on Site Response of Early Warning Stations in Northern Ningxia Based on HVSR Method

作　　者：张文鑫 储翔 张慧 马瑞 ZHANG Wenxin;CHU Xiang;ZHANG Hui;MA Rui(Yinchuan Earthquake Monitoring Central Station,Earthquake Agency of Ningxia Hui Autonomous Region,Ningxia Yinchuan 750001,China)

机构地区：[1]宁夏回族自治区地震局银川地震监测中心站,宁夏银川750001

出　　处：《防灾减灾学报》2025年第2期58-67,共10页Journal of Disaster Prevention And Reduction

基　　金：中国地震局监测、预报、科研三结合课题:宁夏北部预警台站场地响应研究(3JH-202301054)。

摘　　要：场地响应是精确测定震源参数、稳健估计地壳介质衰减变化的关键影响因素之一。基于背景噪声的HVSR法(Horizontal-to-Vertical Spectral Ratio,简称HVSR),对宁夏北部预警台站的场地响应(特征)进行了详细分析。结果显示:该区域预警台站普遍存在不同程度的放大或衰减现象。其中,基准站的HVSR谱比曲线较为平缓,表明此类台站的台基条件和观测环境较为理想;而基本站的HVSR谱比曲线普遍存在明显的频率放大点,且随着频率的增加,场地响应值逐渐减小。这种差异可能由台站所处位置的地形地貌、台基类型及局部地质构造等多种因素共同作用所致。研究成果不仅为地震震级精确测定、震源参数反演提供科学依据,还为地震预警系统的优化升级提供了重要的参考。Site response is one of the key influencing factors for accurately determining the source parameters and robustly estimating the attenuation changes of the crustal medium.Basedon the HVSR method(Horizontalto-Vertical Spectral Ratio),the site response characteristics of the early warning stations in the northern part of Ningxia were analyzed in detail.The results show that there are varying degrees of amplification or attenuation phenomena at the early warning stations in this area.Among them,the HVSR spectral ratio curves of the benchmark stations are relatively flat,indicating that the site conditions and observation environments of such stations are relatively ideal;while the HVSR spectral ratio curves of the basic stations generally have obvious frequency amplification points,and the site response values gradually decrease with the increase of frequency.This difference may be caused by the combined effects of various factors such as the topography and geomorphology,site type,and local geological structure where the stations are located.The research results not only provide a scientific basis for the precise determination of earthquake magnitudes and the inversion of source parameters,but also offer important references for the optimization and upgrading of the earthquake early warning system.

关 键 词：宁夏北部 预警台站 HVSR法 场地响应 背景噪声 

分 类 号：P315.4[天文地球—地震学]