一种提高振动源扫描算法信噪比的方法
|
摘要
在对原始数据进行适当光滑的基础上,利用局部极值特性拟合出数据包络线。经地震波形数据计算检验,利用这种包络线可以较好地提高振动源扫描算法(SSA)的信噪比。而对于无源的随机振动,该方法给出的SSA亮点函数高低值较接近,且亮点函数的高值分布随扫描起始时间及扫描长度的变化与有源信号有较明显差异,这也为评价某时刻点上是否存在有源信号提供了一定的判据。
Based on smoothing the original data,the property of local extremum are employed in interpolating the envelope of data.From some numerical tests of seismic wave,the results reveal the improved envelope can effectively enhance the signal-to-noise of Source-Scanning Algorithm(SSA).However with respect to the non-source stochastic tremor,the SSA bright-function of this method brings on a little difference between the maximum and minimum.Additionally,there is obvious distinction in detectable-source and non-source tremor when the distribution of high bright-function value change as initial scanning time and scanning length.This distinction will be conducive to determine whether there is a detectable tremor source at one point in time.
Based on smoothing the original data,the property of local extremum are employed in interpolating the envelope of data.From some numerical tests of seismic wave,the results reveal the improved envelope can effectively enhance the signal-to-noise of Source-Scanning Algorithm(SSA).However with respect to the non-source stochastic tremor,the SSA bright-function of this method brings on a little difference between the maximum and minimum.Additionally,there is obvious distinction in detectable-source and non-source tremor when the distribution of high bright-function value change as initial scanning time and scanning length.This distinction will be conducive to determine whether there is a detectable tremor source at one point in time.
引文
[1]国家地震局地球物理研究所.近震分析[M].北京:地震出版社,1978:3-8.
[2]姚华建.用基于时间域和频率域的反投影算法研究大地震的破裂过程[R].北京:中国地震局地震预测研究所学术报告,2013.
[3]李文军,李丽,陈棋福.用震源扫描算法(SSA)研究列车源的运动[J].地球物理学报,2008,51(4):1146-1151.
[4]张瑞红,林大超,乔兰.一种改进的震源扫描算法微震定位[J].煤矿安全,2011,42(5):48-51.
[5]Honn Kao,Shao-ju Shan.The source-scanning algorithm:mapping the distribution of seismic sources in time and space[J].Geophys.J.omt.,2004,157:589-594.
[6]Cleve B.Moler.Numerical Computing with MATLAB[M].America:Society for Industrial and Applied Mathematics,2004:255-264.
[2]姚华建.用基于时间域和频率域的反投影算法研究大地震的破裂过程[R].北京:中国地震局地震预测研究所学术报告,2013.
[3]李文军,李丽,陈棋福.用震源扫描算法(SSA)研究列车源的运动[J].地球物理学报,2008,51(4):1146-1151.
[4]张瑞红,林大超,乔兰.一种改进的震源扫描算法微震定位[J].煤矿安全,2011,42(5):48-51.
[5]Honn Kao,Shao-ju Shan.The source-scanning algorithm:mapping the distribution of seismic sources in time and space[J].Geophys.J.omt.,2004,157:589-594.
[6]Cleve B.Moler.Numerical Computing with MATLAB[M].America:Society for Industrial and Applied Mathematics,2004:255-264.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心