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.
出处
《华北地震科学》
2015年第1期46-51,共6页
North China Earthquake Sciences
基金
中国地震局星火计划项目(XH14002Y)
测震青年骨干专项(20130202)
天津市国土重点项目(1212011220232-5)
关键词
振动源扫描
包络线
局部极值
信噪比
tremor source scanning
envelope
local extremum
signal-to-noise
