基于STFT方法对沿海宽频带倾斜仪的噪声分析  

Noise Analysis of Coastal Broadband Tiltmeter Based on STFT Method

作　　者：蔡佩蕊[1] 陈伟[1] 林立峰[1] 陈珊桦[1] 沈健健[1] 杨婕[1] 吴劲柏[1] 李毅伟[1] CAI Peirui;CHEN Wei;LIN Lifeng;CHEN Shanhua;SHEN Jianjian;YANG Jie;WU Jinbai;LI Yiwei(Fujian Earthquake Agency, Fuzhou 351100, Fujian, China)

机构地区：[1]福建省地震局,福建福州351100

出　　处：《地震工程学报》2020年第2期396-402,共7页China Earthquake Engineering Journal

基　　金：中国地震局专项:全国地球物理台网数据跟踪分析与产出。

摘　　要：应用沿海台站莆田地震台、厦门地震台的宽频带倾斜仪观测数据,采用短时傅里叶变换(STFT)分析方法对宽频带倾斜仪的噪声进行分析[1-5],总结噪声的几种表现形态,分析对应的物理意义。宽频带倾斜仪噪声主要有台风干扰,线路接触不良,主板干扰信号等。研究结果可应用于宽频带倾斜仪观测数据的跟踪分析,同时也可以用来判断宽频带倾斜仪的故障类型。Based on the observation data of broadband tiltmeter at coastal seismic stations(Putian and Xiamen stations),this paper analyzes the noise of broadband tiltmeter using the short-time Fourier transform(STFT)method of analysis.Several noise patterns are summarized and the respective physical meaning is analyzed.The broadband tiltmeter noise mainly involves seismic co-seismic wave,typhoon interference,bad line contact,interference signal from the motherboard,etc.The results of the research can be used to track and analyze broadband tiltmeter of observation data,as well as to determine the types of broadband tiltmeter fault.

关 键 词：宽频带倾斜仪 STFT 噪声 地震前兆仪器 跟踪分析 

分 类 号：P319[天文地球—固体地球物理学]