论文标题
多利安飓风兴奋的瑞利浪的多模型
Multimodes of Rayleigh wave excited by hurricane Dorian
论文作者
论文摘要
在过去的二十年中，已经开发出了很好的发展，通过互相关的环境地震噪声或尾声来提取经验绿色的功能（EGF），被认为是在两个接收器中检索新响应的有效方法。但是，EGF以高信噪比（SNR）出现，这需要我们堆叠大量的互相关。在这里，我们从2019年9月3天的三天内从飓风多利安（Hurricane Dorian）释放的环境地震噪声中检索了EGF。我们发现，当多利安飓风从9月4日至6日沿海岸发展时，能量表现出非常强烈的表现。我们的结果表明，由于多利安的噪声源，EGFS表现出强烈的方向性，并且仅在互相关时间的负数下出现。我们从检索到的EGF中提取瑞利波的清晰的多模式分散曲线。实际上，我们的结果表明，多型雷利波波的多模式分散曲线可以从多利安人激发几天甚至一天的环境地震噪声中提取，这意味着我们将扩大地震数据集，以扩大未来研究地球速度结构的剪切速度结构的工作，并更深入地进行了我们的行星。
Extracting Empirical Green's Functions (EGFs) by cross-correlating ambient seismic noise or coda, considered as an efficient approach of retrieving new response inside the media of two receivers, has been developed well in the past two decades. However, EGFs emerge with high Signal-to-Noise Ratios (SNRs), which needs us to stack a large number of cross-correlations. Here, we retrieve EGFs with high SNRs from ambient seismic noise released by hurricane Dorian moving along the eastern coast of the United States during 3 days in Sept 2019. We systematically analyze the energy sources of seismic noise records with time-frequency analysis and beam-forming. We find that the energy exhibits very strongly when hurricane Dorian progresses along the coast from 4th to 6th Sept. Our results suggest that EGFs exhibit strong directionality and only emerge in the negative part of cross-correlation time functions due to the noise sources of Dorian. We extract clear multimodal dispersion curves of Rayleigh waves from retrieved EGFs. Our results, indeed, reveal that multimodal dispersion curves pf Rayleigh wave could be extracted from ambient seismic noise excited by Dorian for several days or even a single day, which means that we enlarge the seismic data sets for the future work of investigating shear velocity structures of the Earth's crust and upper mantle and understanding our planet more deeply.
