河北赤城可控震源主动监测实验  

Active Monitoring Experiment in Chicheng Using Precision Seismic Vibrator

作　　者：董一兵[1,2] 胡斌[1] 杨锐[1] 尹康达[1] 

机构地区：[1]河北省地震局,石家庄050021 [2]中国科学技术大学,合肥230026

出　　处：《华北地震科学》2015年第4期6-13,共8页North China Earthquake Sciences

基　　金：河北省科技支撑计划项目"河北省重点地区壳幔结构及地震监测预报关键技术研究"(13275407D)

摘　　要：利用精密可控主动震源CAS-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5～10～5Hz、4～10～4Hz线性调频信号，布设了赤城一张家口、赤城一张北2条测线，对发射信号进行连续记录。用短时Fou—rier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 Chieheng 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 5-10-5 Hz and 4-10-4 Hz are used and two survey lines are emplaced from Chicheng to Zhangjiakou and from Chieheng 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 calcu- late the velocity ratio （Vp/Vs） of the temporary station. The result is approved to be consistent with the existing researches.

关 键 词：精密可控主动震源 线性调频信号 短时Fourier变换 WHT变换 反褶积 

分 类 号：P631.4[天文地球—地质矿产勘探]