珊溪水库地震与构造地震波谱时-频特征的对比研究
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摘要
基于2002~2006年浙江地震台网记录的数字化波形资料,利用时-频分析方法,研究了珊溪水库诱发地震和构造地震波谱的时-频特征,发现两者的P波波谱存在差异:1)水库诱发地震P波主频低于构造地震;2)水库诱发地震P波频率成分比构造地震丰富,能量密度频谱随频率轴展布较宽,且出现多个能量较强的频率段;3)水库诱发地震P波能量强度的峰值在整个波列中出现时间较构造地震早且能量衰减快。
On the basis of the digital seismic wave data from 2002 to 2006 recorded by the station network in Zhejiang province,with time-frequency analysis method,the time-frequency characteristics of wave spectrum of induced earthquakes in Shanxi reservoir and tectonic earthquakes in Zhejiang have been investigated.It is found that there are differences between them:1) the main frequency of induced earthquake is lower than that of tectonic earthquake;2) the P-wave frequency components of induced earthquake in Shanxi reservoir are more abundant than that of tectonic earthquake,the former's energy density spectrum spreads more broadly along frequency axes,and it has many frequency segments with intense energy;3) the maximum value of energy intensity of P-wave of induced earthquakes occurres in all wave train earlier than that of tectonic earthquake and the energy decays quickly.
On the basis of the digital seismic wave data from 2002 to 2006 recorded by the station network in Zhejiang province,with time-frequency analysis method,the time-frequency characteristics of wave spectrum of induced earthquakes in Shanxi reservoir and tectonic earthquakes in Zhejiang have been investigated.It is found that there are differences between them:1) the main frequency of induced earthquake is lower than that of tectonic earthquake;2) the P-wave frequency components of induced earthquake in Shanxi reservoir are more abundant than that of tectonic earthquake,the former's energy density spectrum spreads more broadly along frequency axes,and it has many frequency segments with intense energy;3) the maximum value of energy intensity of P-wave of induced earthquakes occurres in all wave train earlier than that of tectonic earthquake and the energy decays quickly.
引文
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2于品清,等.水库地震地质构造条件的讨论[J].地壳形变与地震,1983,3(3):71~81.2 Yu P inq ing,et al.D iscuss on geological structure cond itionof reservoir earthquake[J].Crustal Deform ation and Earth-quake,1983,3(3):71-81.(in Ch inese)
3高士钧,甘家思,王清云,等.清江隔河岩水库诱发地震的条件与地震活动特征[J].地壳形变与地震,2001,21(3):93~100.3 Gao Sh ijun,Gan Jiasi,W ang Q ingyun,et al.Cond itions andcharacteristics of induced earthquake in Geheyan reservoirarea,Q ingJiang river[J].Crustal Deform ation and Earth-quake,2001,21(3):93-100.(in Ch inese)
4陈蜀俊,苏爱军,罗登贵.长江三峡水库诱发地震的成因类型[J].大地测量与地球动力学,2004,24(2):70~73.4 Chen Shu jun,Su A ijun and Luo Denggu i.Genesis and typeof induced earthquake in Three Gorges reservoir[J].Journalof Geodesy and Geodynam ics,2004,24(2):70-73.(inCh inese)
5韩晓光,饶扬誉.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,2004,24(2):74~77.5 Han X iaoguang and Rao Yangyu.Analysis of genesis of res-ervoir-induced m icroquakes in Badong reach of Three Gor-ges[J].Journal of Geodesy and Geodynam ics,2004,24(2):74-77.(in Ch inese)
6薛军蓉,黄伟,李峰,等.丹江口水库区地震活动性分析[J].大地测量与地球动力学,2005,25(专刊):45~51.6 Xue Junrong,Huang W e i,L i Feng,et al.Analysis of se is-m ic activity in Dan jiangkou reservoir[J].Journal ofGeodesyand Geodynam ics,2005,25(Spec.):45-51.(in Ch inese)
7司富安.水库地震研究现状及问题探讨[J].水利水电技术,1994,6:25~29.7 S i Fuan.Present state of study on reservoir induced earth-quakes and d iscussion on several prob lem s[J].W ater Re-sources and W aterpower Engineering,1994,6:25-29.(inCh inese)
8姚立,钟羽云,张震峰,等.根据珊溪水库诱发地震拐角频率变化预测震后趋势[J].大地测量与地球动力学,2005,25(专刊):7~12.8 Yao L ixun,Zhong Yuyun,Zhang Zhenfeng,et al.Post-se is-m ic trend pred iction based on change of corner frequency ofinduced earthquake in Shanxi reservoir[J].Journal ofGeod-esy and Geodynam ics,2005,25(Spec.):7-12.(in Ch i-nese)
9胡昌华,周涛,夏启兵,张伟.基于MATLAB的系统分析与设计—时频分析[M].西安电子科技大学出版社,2002.9 Hu Changhua,Zhou Tao,X ia Q ib ing and Zhang W e i.Thetim e-frequency analysis based on system analysis and designofMATLAB[M].X i’an:X id ian Un iversity Press,2002.(in Ch inese)
10吴正国,夏立,尹为民.现代信号处理技术———高阶谱、时频分析与小波变换[M].武汉:武汉大学出版社,2003.10 W u Zhengguo,X ia L i and Y in W e im in.The modern signalprocessing technology-h igh step spectrum,tim e-frequencyanalysis and wavelet transform[M].W uhan:W uhan Un iver-sity Press,2003.(in Ch inese)
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