数字地震仪频响特性与地动噪声功率谱计算  

Calculation of frequency characteristics of digital seismograph and the power spectra of ground motion noises based on Matlab

作　　者：李兴泉[1] 吴朋[1] 邵玉平[1] 唐淋[1] Li Xingquan;WU Peng;SHAO Yuping;TANG Lin(Sichuan Earthquake Agency, Chengdu 610041, China)

机构地区：[1]四川省地震局,中国成都610041

出　　处：《地震地磁观测与研究》2018年第1期96-101,共6页Seismological and Geomagnetic Observation and Research

基　　金：四川省地震局地震科技专项(项目编号:LY1502);国家科技支撑计划课题(项目编号:2014BAK03B00)

摘　　要：地震仪系统是一种稳定的线性动力系统,其特性可由系统的幅频特性和相频特性来描述。本文结合工作实例,分析地震仪系统的一般特性及BBVS-60和CMG-3ESP地震计传递函数的特点,给出数据计算过程中的数学解释,借助Matlab出色的计算功能,绘制地震计幅频特性曲线,并得出地动噪声功率谱值,为分析地震计频响特性、地震台站勘选噪声水平测试提供参考。Seismograph system is a linear stable dynamic system,which can be described by the amplitude-frequency and phase-frequency characteristics.Based on the practical application,characteristics of seismograph system and transfer function of BBVS-60and CMG-3ESP are analyzed in this paper,and the mathematical explanation in the process of data processing is introduced.With amazing computing capacity of Matlab,frequency characteristic curve of digital seismograph is drawn and the power spectra values of ground motion noises are calculated.The method also provides a reference for further work such as analysis of the frequency responsecharacteristics of seismometer and the noise level test of seismic station survey.

关 键 词：Bode函数 频率响应 噪声功率谱 数字地震计 

分 类 号：P315.62[天文地球—地震学]