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首页> 外文期刊>Journal of African Earth Sciences >Source azimuth determination of ambient seismic noise in the Eastern Cape Karoo, South Africa
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Source azimuth determination of ambient seismic noise in the Eastern Cape Karoo, South Africa

机译:南非卡鲁东角环境地震噪声的源方位角确定

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摘要

Ambient seismic noise correlation is increasingly used as a tool to image the subsurface at local and global scale. Cross-correlating ambient noise records relies heavily on the temporal and spatial destribution of the ambient noise. Specifically, the ambient seismic noise of the earth, is almost never homogenous at any moment in time and azimuth, therefore it is important to characterize the source direction, since this could lead to bias in seismic velocities in tomography application. In this study, the cross-correlations between pairs of stations deployed in the Eastern Cape Karoo of South Africa are used to determine the approximate source azimuth of the ambient seismic noise. This is done by measuring normalized amplitudes of the Rayleigh wave arrivals and station-station azimuths for positive and negative correlation times. Analysis of the multiple cross-correlation pairs and resulting azimuthal distribution show that most of the Eastern Cape Karoo ambient noise is generated near the coast of South Africa.
机译:环境地震噪声的相关性越来越多地用作在局部和全局范围内对地下成像的工具。互相关的环境噪声记录在很大程度上依赖于环境噪声的时间和空间分布。具体而言,地球的环境地震噪声在任何时间和方位几乎都不会均匀,因此表征源方向非常重要,因为这可能导致层析成像应用中地震速度出现偏差。在这项研究中,使用部署在南非东卡鲁地区的成对站之间的互相关来确定环境地震噪声的近似源方位角。通过测量正相关时间和负相关时间的瑞利波到达和站台方位角的归一化幅度来完成。对多个互相关对和由此产生的方位角分布的分析表明,东卡普角东部大部分环境噪声是在南非海岸附近产生的。

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