PDF(16358 KB)
Ambient seismic noise levels at temporary broadband seismic stations in the western South China Block and their implications
Yao XU, JiaYong YAN, YongQian ZHANG, ChangXin CHEN, Kun ZHANG, JiaHao LIU, ZhiWu XU, HuiZi NIE
Prog Geophy ›› 2026, Vol. 41 ›› Issue (5) : 2410-2429.
PDF(16358 KB)
PDF(16358 KB)
Ambient seismic noise levels at temporary broadband seismic stations in the western South China Block and their implications
Temporary broadband seismic observation plays a crucial role in the study of the deep structure and dynamic processes of the South China Block. However, although scholars have been deploying a large number of temporary broadband seismic stations across the South China Block and have achieved abundant research outcomes, systematic research on the quality of observation data from these stations remains insufficient yet necessary. Ambient seismic noise is an important parameter for evaluating the data quality of broadband seismic station, which can be quantitatively characterized by calculating the Power Spectral Density (PSD) of the observation data and statistically analyzing the corresponding Probability Density Function (PDF). Therefore, this study firstly obtains the ambient seismic noise levels at 7 temporary broadband seismic stations located in the western South China Block by using the PSD PDF method. Subsequently, taking station LH23 as a typical example, this study analyzes the main sources of ambient seismic noise in different frequency bands and their characteristics. In addition, this study also investigates the origins of high outliers in the PSD results, along with the morphological features of the corresponding curves. The results of this study indicate that cultural noise, microseism, and ground tilt noise are the main sources of ambient seismic noise in different frequency bands at the temporary broadband seismic stations in the western South China Block. These noise sources exhibit different diurnal or seasonal variations, and the interference of the same noise source on horizontal and vertical components also shows discrepancies. Seismic events, intense near-station anthropogenic activities, and system transients can all result in high outliers in the PSD results, while the corresponding deformation of curves induced by these different reasons present distinct characteristics. Based on the above results, this study further proposes suggestions for the deployment of temporary broadband seismic stations in the South China Block, from the aspects of station site selection, vault construction, as well as seismograph performance testing and station maintenance.
The western South China Block / Temporary broadband seismic station / Ambient seismic noise / Power spectral density / Probability density function
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感谢审稿专家提出的修改意见；感谢中国地震局地球物理研究所地震科学国际数据中心提供的台站信息(Doi:10.11998/IESDC)；感谢曾庆贺、陈煜烽、王栩、余爱民、刘世俊、李宝文和杨卫东在数据收集阶段提供的帮助；感谢王祥提供的流动台站建台建议；在程序编写和文章撰写阶段，得到了程永志、张文文和陈昊等博士的大力支持和帮助，在此表示感谢；本研究的部分图件由GMT6绘制，感谢Wessel等(2019)提供的免费作图软件.
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