测震台干扰源分析方法研究--以武汉市蔡甸测震台为例

Research on the analysis method of interference sources at seismic stations:taking Caidian Seismic Station in Wuhan as an example

为更好地保护测震台观测环境,针对现有干扰源确定工作缺少系统性方法和法律层面不够严谨的问题,提出一种基于实际工作流程的测震台干扰源分析方法。在分析台站受干扰程度、确立工作依据的基础上,研究干扰信号的时间、空间、强度和频率特点,根据规范要求和干扰特点缩小调查范围,并进行现场调查,逐项排除非干扰源,通过分析剩余干扰源与噪声强度的相关性,确定台站主要干扰源。本方法包含法制要求、数据分析和调查要点等,提出测震台干扰源应同时满足特征性、排他性、相关性3项关键指标,在武汉市测震与地球物理站网规划、地震观测环境保护和台站建设选址等方面取得良好的实际应用效果。

In order to better protect the observation environment of the seismic station,this paper proposes a method for analyzing the interference sources of the seismic station based on the actual work process,aiming at the lack of systematic methods and insufficient legal level in the existing determination of interference sources.Firstly,based on the analysis of the degree of interference to the station and the establishment of working basis,this paper studies the time,space,intensity and frequency characteristics of interference signals.Then,according to the requirements of norms and interference characteristics,the investigation scope is narrowed and on-site investigation is conducted to eliminate non-interference sources one by one.Finally,the main interference sources of the station are determined by analyzing the correlation between the remaining interference sources and noise intensity.This method includes legal requirements,station data analysis and investigation work points.It is proposed that the interference sources of seismic stations should meet three key indicators of characteristics,exclusivity,and relevance.Good practical application results have been achieved in the planning of seismic and geophysical station networks,earthquake observation environment protection,and station construction site selection in Wuhan.