鹤岗地震台阵勘选记录信号及噪声的相关性分析

Correlation analysis of signal and noise of Hegang Seismic Array survey data

基于2019年中国地震局"一带一路"鹤岗地震台阵勘选资料,分析了勘选测点记录的近震Pg震相和远震P波震相在时间域和频率域的相关性。时间域相关分析结果显示,鹤岗地震台阵场地对近震Pg震相和远震P波震相的最佳监测距离分别约为550 m和1570 m;频率域相干分析显示,监测远震P波信号的最佳距离约1570 m,与时间域分析结果一致;近震和远震的最佳监测距离分别对应勘选台阵最内圆和最外圆半径,可作为该台阵布局设计的依据。台阵增益分析显示,勘选台阵对于Pg和P波震相识别具有一定增强作用。

Based on the Hegang Seismic Array survey data in 2019 from the"the Belt and Road Initiatives"Seismic Network Project of China Earthquake Administration,the correlation between the Pg phase of near earthquakes and the P phase of distant earthquakes in the time domain and frequency domain is analyzed.The time-domain correlation analysis result shows that the best monitoring distances for the Pg phase and P phase are about 550 m and 1570 m,respectively.Coherence analysis in the frequency domain shows that the optimal distance for monitoring teleseismic P-wave signals is about 1570 m.The best monitoring distances for near and distant earthquakes correspond to the radius of inner and outer circles of the survey array,respectively,which can be used as a basis for the layout design of the array.The array gain analysis shows that the surveyed array has a certain enhancement effect on the recognition of Pg and P phases.