CZB竖直摆钻孔倾斜数据在FFT及小波分析上的映震效应浅析  

SEISMIC REFLECTION EFFECT OF CZB VERTICAL PENDULUM BOREHOLE TILT DATA ON FFT AND WAVELET ANALYSIS

作　　者：王必显 尹亮 邹小波 刘鸿斌 陈雪梅 WANG Bixian;YIN Liang;ZOU Xiaobo;LIU Hongbin;CHEN Xuemei(Tianshui Earthquake Monitoring Central Station,Gansu Earthquake Agency,Tianshui 141020,China;Zhangye Earthquake Monitoring Central Station,Gansu Earthquake Agency yGaotai 134300,China;Wuwei Earthquake Monitoring Central Station,Gansu Earthquake Agency yWuwei 133000,China)

机构地区：[1]甘肃省地震局天水地震监测中心站,甘肃天水741020 [2]甘肃省地震局武威地震监测中心站,甘肃武威733000 [3]甘肃省地震局张掖地震监测中心站,甘肃高台734300

出　　处：《高原地震》2021年第4期39-48,共10页Plateau Earthquake Research

摘　　要：利用FFT频谱分析方法,分别分析19个地震(包括2008~2017年国外主要8.0级以上地震、国内主要7.0级以上地震、以及甘肃及周边主要5.0级以上地震)震前10天内,兰州、天水、高台、陇南地震台CZB钻孔倾斜仪的预处理分钟值数据,并提取短临异常。在提取短临异常的过程中,剔除了各类干扰,确保异常的可信度;利用小波变换方法,分别分析上述19个地震前1~3个月内,兰州、天水、高台、陇南等地震台站CZB钻孔倾斜仪的预处理整点值数据,并提取短临异常。并将分析结果,做台站间对比分析,剔除干扰,总结异常的同步性。通过震例研究,总结形变资料中的震前短临异常变化特征,发现所选数据在FFT及小波分析上均有较好的映震效应。By using FFT spectrum analysis method, the pre-processing minute data onto CZB borehole tilt-meter in Lanzhou, Tianshui, Gaotai and Longnan during the 10 days before 19 earthquakes(including major earthquakes with M8.0 or above abroad, M7.0 or above in China, and M5.0 or above in Gansu and its surrounding areas) were analyzed, and the short impending anomalies were extracted.In the process of extracting the short-term and imminent anomalies, all kinds of interferences are eliminated to ensure the reliability of the anomalies.Using the wavelet transforms method, the whole point value data onto CZB vertical pendulum borehole tilt-meter of Lanzhou, Tianshui, Gaotai, Longnan and other stations in 1-3 months before the 19 earthquakes are analyzed respectively, and the short-term and imminent anomalies are extracted.The analysis results are compared with stations to eliminate interference and summarize the synchronization of anomalies.Through the study of earthquake examples, the characteristics of short-term and imminent abnormal changes before earthquakes in deformation data are summarized, and it is found that the selected data have good reflection effect on FFT and wavelet analysis.

关 键 词：钻孔倾斜 地脉动 FFT 小波变换 短临异常 

分 类 号：P315.725[天文地球—地震学]