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高采样率四分量钻孔应变同震响应分析
刘琦1, 张晶1, 晏锐2, 武艳强1, 闫伟2
1.中国地震局地震预测研究所,北京市复兴路63号100036;2.中国地震台网中心,北京100045
摘要:
针对2012年4月11日苏门答腊北部附近海域8.6级地震,选取了2套10Hz采样YRY型四分量钻孔应变仪、1套100Hz采样FBS-3B型宽频带地震计的观测结果,在预处理后对比分析了上述观测结果在同震时段的响应特征。利用S变换方法研究了整个同震时段的频谱动态演化过程,并对各震相时段的频谱细节进行了分析。同站点地震仪与钻孔应变仪S变换结果表明,二者的同震频谱演化过程具有较好的一致性,可以相互参照进行波动信号的甄别,说明钻孔应变仪在高频端的监测结果是可靠的。
关键词:  高采样率  四分量  应变  同震  时频分析  
DOI:
分类号:
基金项目:中国地震局地震行业科研专项(201108009)、中国地震局地震预测研究所基本科研业务费专项(2012IES0202)和2012年度青年震情跟踪课题(2012020212)共同资助
The analysis of coseismic response of 4-component borehole strainmeters with high sampling rate
Liu Qi1, Zhang Jing1, Yan Rui2, Wu Yanqiang1, Yan Wei2
1.Institute of Earthquake Science, CEA, Beijing 100036, China;2.China Earthquake Networks Center, Beijing 100045, China
Abstract:
In this paper, we adopt two sets of 10 Hz YRY 4-component borehole strainmeters and one set of 100 Hz FBS-3B broadband seismometer to study the 11 April 2012 Mw8.6 earthquake off the west coast of northern Sumatra, and compare the response characteristics during the coseismie stage after preproeessing the data. We study the spectrum's dynamic process during the coseismic stage with the S transformation method, and analyze on the spectrum's details of different seismic phases. The S transformation results of collocated seismometer and borehole strainmeter show that the two eoseismic spectrum evolutions have much in common and can help each other to identify the wave signals, so it's reliable to observe the data at high frequency using the borehole strainmeters.
Key words:  High sampling rate  4-component  Strain  Coseismic  Time-frequency analysis