河北赤城可控震源主动监测实验
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摘要
利用精密可控主动震源CASS-40在赤城开展了2次信号发射与监测实验。实验中分别采用5~10~5 Hz、4~10~4Hz线性调频信号,布设了赤城—张家口、赤城—张北2条测线,对发射信号进行连续记录。用短时Fourier变换分析了发射信号的时频特征,用反褶积和WHT变换2种方法计算得到了2条测线的地震波走时剖面,对结果进行了对比分析。选取震相清晰的临时台站计算了波速比(Vp/Vs),结果与已有的研究成果相符。
Two experiments are done in Chicheng in which the CASS-40 seismic vibrator is used to trigger seismic waves and temporary stations are set up to receive the waves.In the experiment,the chirp signal at 5-10-5Hz and 4-10-4Hz are used and two survey lines are emplaced from Chicheng to Zhangjiakou and from Chicheng to Zhangbei to continuously record the transmitted signal.STFT(Short-time Fourier Transform)is used to analyze the frequency characteristics of the LFM(Linear Frequency Modulation),and two methods of deconvolution and WHT(Wigner-HoughTransform)are both used to get the seismic wave travelling curve.The difference between their results is analyzed.Clear phases are selected to calculate the velocity ratio(Vp/Vs)of the temporary station.The result is approved to be consistent with the existing researches.
Two experiments are done in Chicheng in which the CASS-40 seismic vibrator is used to trigger seismic waves and temporary stations are set up to receive the waves.In the experiment,the chirp signal at 5-10-5Hz and 4-10-4Hz are used and two survey lines are emplaced from Chicheng to Zhangjiakou and from Chicheng to Zhangbei to continuously record the transmitted signal.STFT(Short-time Fourier Transform)is used to analyze the frequency characteristics of the LFM(Linear Frequency Modulation),and two methods of deconvolution and WHT(Wigner-HoughTransform)are both used to get the seismic wave travelling curve.The difference between their results is analyzed.Clear phases are selected to calculate the velocity ratio(Vp/Vs)of the temporary station.The result is approved to be consistent with the existing researches.
引文
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[2]王宝善,王伟涛,葛洪魁,等.人工震源地下介质变化动态监测[J].地球科学进展,2011,26(3):249-256.
[3]陈颙,王宝善,葛洪魁,等.建立地震发射台的建议[J].地球科学进展,2007,22(5):441-446.
[4]王洪体,庄灿涛,薛兵,等.2009.精密主动震源监测.地球物理学报,52(7):1808-1815.
[5]Ikuta R,Yamaoka K,Miyakawa K,et al.Continuous monitoring of propagation velocity of seismic wave using ACROSS[J].Geophysical Research Letters,2002,29(13):1627.doi:10.1029/2001GL013974.
[6]杨微,葛洪魁,王宝善,等.由精密控制人工震源观测到的绵竹5.6级地震前后波速变化[J].地球物理学报,2010,53(5):1149-1157.-
[7]刘希康.精密可控震源信号提取新方法研究[D].中国地震局地震预测研究所,2013.
[8]李垚奇,古云鹤,马世虎,等.陀螺寻北仪快速定向划线装置的设计[J].华北地震科学,2014,32(4):50-52,59.
[9]张磊,张新东,谭青,等.地震计位置校正[J].华北地震科学,2014,32(4):57-59.
[10]葛洪魁,陈海潮,欧阳飚,等.流动地震观测背景噪声的台基响应[J].地球物理学报,2013,58(4):857-868.
[11]赵淑红,张文波.短时傅立叶变换在研究沉积旋回地质体中的应用[J].长安大学学报(地球科学版),2003,25(2):59-62.
[12]曹磊.基于Gabor变换的反褶积方法研究及应用[D].吉林大学,2009.
[13]孙晓昶,皇甫堪.基于Wigner-Hough变换的多分量LFM信号检测及离散计算方法[J].电子学报,2003,31(2):241-244.
[14]刘继禄,张从珍,李雪英,等.张北6.2级地震前京西北地区地震波速比的异常变化[J].地震地磁观测与研究,2000,21(1):7-11.
[15]张学民,刁桂苓,束沛镒,等.华北地区地下介质波速比值(Vp/Vs)研究[J].地震地质,2004,26(2):305-317.
[16]刘希康,崔仁胜,王洪体,等.用Wigner-Hough变换检测精密可控震源信号[J].地震,2013,33(3):33-42.
[17]赵明淳,刁桂苓,张学民.首都圈平均波速比分析[J].西北地震学报,2005,27(3):246-254.