CAJ | 학술논문

利用华北科学探测台阵180多个宽频带台站2007年的连续记录,得到了台站之间噪声互相关函数.通过对三个分量记录的相关运算,获得了Rayleigh波和Love波的经验格林函数,分析了其信噪比随周期的变化和高信噪比台站对的方位分布.利用经验格林函数的非对称性和聚束方法,研究了华北科学探测台阵地震噪声的方位分布,及其季节变化特征.尽管噪声源的分布随季节有轻微变化,但全年的分析结果表明,10～32 s周期内华北台阵的地震噪声源在各个方向上的分布近于均匀,这为利用噪声成像提供了理论前提.
이용화북과학탐측태진180다개관빈대태참2007년적련속기록,득도료태참지간조성호상관함수.통과대삼개분량기록적상관운산,획득료Rayleigh파화Love파적경험격림함수,분석료기신조비수주기적변화화고신조비태참대적방위분포.이용경험격림함수적비대칭성화취속방법,연구료화북과학탐측태진지진조성적방위분포,급기계절변화특정.진관조성원적분포수계절유경미변화,단전년적분석결과표명,10～32 s주기내화북태진적지진조성원재각개방향상적분포근우균균,저위이용조성성상제공료이론전제.
Noise Cross-Correlation Function (NCF) is obtained by processing one-year ambient noise observed at over 180 broad-band stations from North China Array. All available three-component time series are used to extract the Rayleigh and Love waves. The Signal-to-Noise Ratio (SNR) at different periods and the azimuth distribution of the inter-station pairs with high SNR are discussed. The azimuth distributions of the ambient noise source are investigated by analyzing the beamforming output. Although seasonal variations are observed from the beamforming output, the source distribution at 10～32 s is almost uniformly distributed in all directions, which allows us to perform the following detailed tomography safely.