反卷积在人工震源数据处理中的应用  

Application of deconvolution in data processing of artificial seismic source

作　　者：尹康达[1] 贾晓辉[1] 董一兵[1] 王宁[1] 

机构地区：[1]河北省地震局,中国石家庄050021

出　　处：《地震地磁观测与研究》2017年第5期66-70,共5页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地震科技星火计划项目(基金项目:XH16007Y);河北省地震局地震科技星火计划项目(基金项目:DZ20160406027);河北省地震局地震科技星火计划项目(基金项目:DZ20170328007)

摘　　要：震源到接收台站之间的地层响应函数能够反映地下介质信息。对地震波传播过程中的卷积模型进行推导:记录信号是众多震源子波经过时移加权叠加的结果;通过反卷积方法可去除震源子波信息,提取震源到接收台站之间的地层响应函数;地层响应函数中第一个突跳值对应的时间即为P波走时。在河北赤城—张北地区进行人工震源实验,通过反卷积计算得到该地区地层响应函数剖面图,得出P波波速约6 km/s。利用人工震源系统还可以对地下介质波速变化进行长期动态监测,对地震预测具有一定意义。The stratigraphic response function between the seismic source and the receiving station can reflect the properties of subsurface medium. The convolution model of seismic wave propagation has been discussed and it is concluded that the recorded signal is the result of time-shift and weighted stack of multitudinous seismic wavelets; The wavelet information can be removed and the stratigraphic response function between the seismic source and the receiving station can be extracted by deconvolution method; The time of the first jump in the stratigraphic response function is the P-wave travel time. The artificial seismic source experiment was conducted in the region from Chicheng to Zhangbei, Hebei Province. We figured out the profile of the stratigraphic response function of this region by deconvolution and concluded that the P-wave velocity is 6 km/s. The artificial seismic source system can also be used to monitor the change of wave velocity of subsurface medium, which is significant to earthquake prediction.

关 键 词：地层响应函数 震源子波 时移加权叠加 反卷积 

分 类 号：P631.44[天文地球—地质矿产勘探]